Efficient Select Query
Hi,
I want to have an effective select query with inner join for retrieving the fields
LIKP~LFDAT
VBRK~FKDAT
VBRP~FKIMG
VBEP~BMENG
with the common field VBELN that is there in all these tables...
If inner join is used four joins will come. Is it acceptable?
Thanks
Dinesh
Hi,
plz go through the following example------
TABLE DECLERATION
TABLES : MARA ,
MARC ,
MARD ,
MAKT.
DATA DECLERATION
TYPES : BEGIN OF STRUCT_MAT,
MATNR TYPE MATNR,
MEINS TYPE MEINS,
WERKS TYPE WERKS_D,
LGORT TYPE LGORT_D,
MAKTX TYPE MAKTX,
END OF STRUCT_MAT.
INTERNAL TABLE
DATA : ITAB TYPE STANDARD TABLE OF STRUCT_MAT WITH HEADER LINE.
SELECTION SCREEN
SELECT-OPTIONS : S_MATNR FOR MARA-MATNR.
S T A R T - O F - S E L E C T I O N
START-OF-SELECTION.
SELECT
A~MATNR
A~MEINS
B~WERKS
C~LGORT
D~MAKTX
INTO CORRESPONDING FIELDS OF TABLE ITAB
FROM MARA AS A
INNER JOIN MARC AS B ON
AMATNR = BMATNR
LEFT OUTER JOIN MARD AS C ON
BMATNR = CMATNR AND
BWERKS = CWERKS
INNER JOIN MAKT AS D ON
AMATNR = DMATNR
WHERE A~MATNR IN S_MATNR .
IF SY-SUBRC <> 0.
EXIT.
ENDIF.
W R I T E
WRITE :5 'MATERIAL NO' COLOR 3,
25 'PLANT' COLOR 3,
40 'STORAGE LOC' COLOR 3,
60 'DESCRIPTION' COLOR 3,
120 'UOM' COLOR 3.
ULINE.
LOOP AT ITAB.
WRITE :/5 ITAB-MATNR COLOR 6 INVERSE,
25 ITAB-WERKS COLOR 6,
40 ITAB-LGORT COLOR 6,
60 ITAB-MAKTX COLOR 6,
120 ITAB-MEINS COLOR 6.
ENDLOOP.
*****do rewards if usefull
vijay
Similar Messages
-
Questions on the most efficient select query..
What is the difference between the two select query & please explain y is the 2nd select query more efficient??
DATA: MAX_MSGNR type t100-msgnr.
MAX_MSGNR = '000'.
SELECT * FROM T100 INTO T100_WA
WHERE SPRSL = 'D' AND
ARBGB = '00'.
CHECK: T100_WA-MSGNR > MAX_MSGNR.
MAX_MSGNR = T100_WA-MSGNR.
ENDSELECT.
DATA: MAX_MSGNR type t100-msgnr.
SELECT MAX( MSGNR ) FROM T100 INTO max_msgnr
WHERE SPRSL = 'D' AND
ARBGB = '00'.Hi,
First never use Check statement in the Select.
Next thing Select ... end select.
Coming to ur question In case of first select it will fetch each record from the data base and compares that record value with the variable(MAX_MSGNR) and assigns the value to the variable. And this process will continue till the select reads all the records of the data base. Also these operations happens on the data base server. SO this query not only affect ur program but also others who is accessing the same data base.
Second query is most efficient because of the aggregate function MAX. Here it will fetch all the records in single go and checks the max value for that column using
optimising algorithm. So number of checks, assignments(single assignment) and fetches will be less compared to first select. This is the main reason. Hope this clarified ur doubt.
Another thing is in first query we are selecting all the fields where as in second we are selecting only one field(required)
Thanks,
Vinod.
Edited by: Vinod Kumar Vemuru on Mar 13, 2008 4:55 PM -
Can we replace this SELECT query by more efficient code
can we replace this SELECT query by more efficient code ?:-
SELECT * FROM zv7_custord
INTO TABLE G_T_ZV7_CUSTORD
WHERE ( SENDER in S_SENDER and
ORDNUM in S_ORDER and
ZDATE in S_DATE ) OR
( SENDER in S_SENDER AND
STATUS = SPACE )
ORDER BY IDOCNUM.Hi
U can leave ORDER BY option and sort the table by yourself and try to split the query:
SELECT * FROM zv7_custord
INTO TABLE G_T_ZV7_CUSTORD
WHERE SENDER in S_SENDER and
ORDNUM in S_ORDER and
ZDATE in S_DATE .
SELECT * FROM zv7_custord
APPENDING TABLE G_T_ZV7_CUSTORD
WHERE SENDER in S_SENDER and
NOT ORDNUM in S_ORDER and
NOT ZDATE in S_DATE and
STATUS = SPACE
or
SELECT * FROM zv7_custord
INTO TABLE G_T_ZV7_CUSTORD
WHERE SENDER in S_SENDER and
ORDNUM in S_ORDER and
ZDATE in S_DATE .
SELECT * FROM zv7_custord
APPENDING TABLE G_T_ZV7_CUSTORD
WHERE SENDER in S_SENDER and
STATUS = SPACE.
* Sort the table key fields
SORT G_T_ZV7_CUSTORD BY <KEY1> <KEY2> .....
DELETE ADJACENT DUPLICATES FROM G_T_ZV7_CUSTORD COMPARING <KEY1> .....
Max -
Cursor in select query in row to column format
Hi
I have the query like below
SELECT d.department_id,
CURSOR(SELECT e.first_name,
e.last_name
FROM employees e
WHERE e.department_id = d.department_id
) emps
FROM depatments dI want the result set in a format of Row To columns like
10 20
<cursor result> <cursor result>pls give ur suggestions how to achieve this in a efficient way?I tried the method of "max(decode(.." but dont think so its possible with thisvishnu prakash wrote:
Hi
I have the query like below
SELECT d.department_id,
CURSOR(SELECT e.first_name,
e.last_name
FROM employees e
WHERE e.department_id = d.department_id
) emps
FROM depatments dI want the result set in a format of Row To columns like
10 20
<cursor result> <cursor result>pls give ur suggestions how to achieve this in a efficient way?I tried the method of "max(decode(.." but dont think so its possible with thisNumber of column of a select query is static. Must be known at the parsing time itself. But in your case i dont think the number of columns will be limited to 2 (10 and 20) there could be many more.
You can search this forum to see how to PIVOT your data. There are lot of example. You can also try dynamic pivot. Its all in here, just search. -
Parallel process in select query
Hi Experts
its production
stats are good
indexes are good
issue :
a select query is taking time 20min , the indexes exists on the where clause columns, I tried the query using parallel hint it gave the results iin 20 sec.
the DOP of the table set to 10, but when I run the query it picks old plan
constraints : I cannot modify the query, it needs to be tuned without modifying it
if DOP is >1 then select is expected to use parallellism in explain plan..is my understanding correct?
if I am wrong please advice how can i force the query to use the parallellism
Please advice and guide asap
THanks in advance
Ajay Kumaruser513478 wrote:
Hi Experts
its production
stats are good
indexes are good
issue :
a select query is taking time 20min , the indexes exists on the where clause columns, I tried the query using parallel hint it gave the results iin 20 sec.
the DOP of the table set to 10, but when I run the query it picks old plan
constraints : I cannot modify the query, it needs to be tuned without modifying itWhat version of Oracle?
Tuning SQL without modifying the SQL can be very hard but you may have options.
Could you use a materialized view with automatic query rewrite?
Can you use a SQL profile to affect performance?
Have you looked very+ carefully at the indexes to see if other indexes might be more efficient?
20 minutes to 20 seconds sounds too good to be true. Are you sure you aren't reading cached data and that the 2nd, faster run really is running in parallel? -
OPtimizing Performance for Select query on huge table
Hi All,
We are fetching a single record from NAST table. The table has around 10 Million Entries.
The Select Query takes around 5-6 minutes to return.
We are not using the Primary key completely. We are using only one field of the primary key.
The field is also a part of the Index but we are not using all the fields in the index as well.
We need to bring down the time. What can be the solution? I cant see any changes to the code, since its a single query and we cant use the Entire Primary key.
Would creating an Index on the fields that we are concerned with help in this regard.
Open to all solutions.
Thanks in Advance,
ImranThere are sometimes tricks you can use to get it to use the index more efficiently. If you let us know which fields you are using in the SELECT (all of them actually), we might be able to help.
Or are you saying you can't change the code at all?
Please don't create duplicate posts though.
Rob
Message was edited by:
Rob Burbank -
Performance Tuning on a Select Query
Hi,
We have a select statement as mentioned below.
SELECT loobj1 gpart vkont proid tdate lotyp lockr
INTO TABLE tb_dfkklocks
FROM dfkklocks
FOR ALL ENTRIES IN tb_fkkvkp
WHERE
lotyp = '02'
AND proid = '01'
AND lockr >= '0'
AND lockr <= '9'
AND gpart = tb_fkkvkp-gpart
AND vkont = tb_fkkvkp-vkont.
We have Primary key as shown below.
CLIENT
LOOBJ1
LOTYP
PROID
LOCKR
FDATE
TDATE
GPART
VKONT
We have a secondary index only on TDATE. What can be the ideal select stement to improve the performance?
Regards,
Lijo JosephHi Lijo,
Couple of pointers from my end.
1). Try avoiding a FOR ALL ENTRIES if the base table is huge. Instead use a array fetch and pick up more data instead of trying to restrict the data using a FOR ALL ENTRIES as this does a LOOP on the database while selecting the data.
So i would suggest not use FOR ALL ENTRIES if the base table is huge. So analyse before using a select query.
2). It is actually very difficult to mention which option is better. I would say that it all depends on the scenario. What amount of data is to be read, from which table it is being read, what kind of processing is required on database,..... and many more analysis goes to write a an efficient select statement.
3). If i am not wrong i think if you are using a FOR ALL ENTRIES and dont specify the key completely then there is no gaurentee that you fetch all the unique records. The system will compare all the character fields as a KEY field and it will not fetch all the records. So while using a FOR ALL ENTRIES its recommended to use all the key fields.
4). If you would like to really spend time and work on a efficient select statement then try using the tcode ST05 --> Select the button EXPLAIN SQL REQUEST.
type in your select query and see what is the cost of the select statement fired on the database. This will help you to select the best statement. This is a very useful tool if we have complex select statements.
Hope this info is helpful.
Cheers
VJ
Message was edited by: Vijayendra Rao -
Please suggest a select query / sub query with out using any subprograms or
source table: Three columns ORIGIN, DESTINATION,MILES
Origin Destination Miles
Sydney Melbourne 1000
Perth Adelaide 3000
Canberra Melbounre 700
Melbourne Sydney 1000
Brisbane Sydney 1000
Perth Darwin 4000
Sydney Brisbane 1000
out put :Three columns ORIGIN, DESTINATION,MILES
Duplicate routes are to be ignored so the output is
Origin Destination Miles
Sydney Melbourne 1000
Perth Adelaide 3000
Canberra Melbounre 700
Brisbane Sydney 1000
Perth Darwin 4000
Please suggest a select query / sub query with out using any subprograms or functions/pkgs to get the out put table.Hi,
user9368047 wrote:
... Please suggest a select query / sub query with out using any subprograms or functions/pkgs to get the out put table.Why? If the most efficient way to get the results you want involves using a function, why wouldn't you use it?
Here's one way, without any functions:
SELECT a.*
FROM source_table a
LEFT OUTER JOIN source_table b ON a.origin = b.destination
AND a.destination = b.origin
AND a.miles = b.miles
WHERE b.origin > a.origin -- Not b.origin > b.origin
OR b.origin IS NULL
;If you'd care to post CREATE TABLE and INSERT statements for your sample data, then I could test this.
Edited by: Frank Kulash on Nov 6, 2012 7:39 PM
Corrected WHERE clause after MLVrown (below) -
How an INDEX of a Table got selected when a SELECT query hits the Database
Hi All,
How an Index got selected when a SELECT query hits the Database Table.
My SELECT query is as ahown below.
SELECT ebeln ebelp matnr FROM ekpo
APPENDING TABLE i_ebeln
FOR ALL ENTRIES IN i_mara_01
WHERE werks = p_werks AND
matnr = i_mara_01-matnr AND
bstyp EQ 'F' AND
loekz IN (' ' , 'S') AND
elikz = ' ' AND
ebeln IN s_ebeln AND
pstyp IN ('0' , '3') AND
knttp = ' ' AND
ko_prctr IN r_prctr AND
retpo = ''.
The fields in the INDEX of the Table EKPO should be in the same sequence as in the WHERE clasuse?
Regards,
VijiHi,
You minimize the size of the result set by using the WHERE and HAVING clauses. To increase the efficiency of these clauses, you should formulate them to fit with the database table indexes.
Database Indexes
Indexes speed up data selection from the database. They consist of selected fields of a table, of which a copy is then made in sorted order. If you specify the index fields correctly in a condition in the WHERE or HAVING clause, the system only searches part of the index (index range scan).
The primary index is always created automatically in the R/3 System. It consists of the primary key fields of the database table. This means that for each combination of fields in the index, there is a maximum of one line in the table. This kind of index is also known as UNIQUE. If you cannot use the primary index to determine the result set because, for example, none of the primary index fields occur in the WHERE or HAVING clause, the system searches through the entire table (full table scan). For this case, you can create secondary indexes, which can restrict the number of table entries searched to form the result set.
reference : help.sap.com
thanx. -
Basic query regarding work-area and select query
hi
dear sdn members,
thanks too all for solving all my query's up till now
i am stuck in a problem need help
1) why basically work-area has been used ? the sole purpose
2) different types of select query ? only coding examples
note: no links pls
regards,
virushi,
Work Area
Description for a data object that is particularly useful when working with internal tables or database tables as a source for changing operations or a target for reading operations.
WORKAREA is a structure that can hold only one record at a time. It is a collection of fields. We use workarea as we cannot directly read from a table. In order to interact with a table we need workarea. When a Select Statement is executed on a table then the first record is read and put into the header of the table and from there put into the header or the workarea(of the same structure as that of the table)of the internal table and then transferred top the body of the internal table or directly displayed from the workarea.
Each row in a table is a record and each column is a field.
While adding or retrieving records to / from internal table we have to keep the record temporarily.
The area where this record is kept is called as work area for the internal table. The area must have the same structure as that of internal table. An internal table consists of a body and an optional header line.
Header line is a implicit work area for the internal table. It depends on how the internal table is declared that the itab will have the header line or not.
.g.
data: begin of itab occurs 10,
ab type c,
cd type i,
end of itab. " this table will have the header line.
data: wa_itab like itab. " explicit work area for itab
data: itab1 like itab occurs 10. " table is without header line.
The header line is a field string with the same structure as a row of the body, but it can only hold a single row.
It is a buffer used to hold each record before it is added or each record as it is retrieved from the internal table. It is the default work area for the internal table.
With header line
SELECT.
Put the curson on that word and press F1 . You can see the whole documentation for select statements.
select statements :
SELECT result
FROM source
INTO|APPENDING target
[[FOR ALL ENTRIES IN itab] WHERE sql_cond]
Effect
SELECT is an Open-SQL-statement for reading data from one or several database tables into data objects.
The select statement reads a result set (whose structure is determined in result ) from the database tables specified in source, and assigns the data from the result set to the data objects specified in target. You can restrict the result set using the WHERE addition. The addition GROUP BY compresses several database rows into a single row of the result set. The addition HAVING restricts the compressed rows. The addition ORDER BY sorts the result set.
The data objects specified in target must match the result set result. This means that the result set is either assigned to the data objects in one step, or by row, or by packets of rows. In the second and third case, the SELECT statement opens a loop, which which must be closed using ENDSELECT. For every loop pass, the SELECT-statement assigns a row or a packet of rows to the data objects specified in target. If the last row was assigned or if the result set is empty, then SELECT branches to ENDSELECT . A database cursor is opened implicitly to process a SELECT-loop, and is closed again when the loop is ended. You can end the loop using the statements from section leave loops.
Up to the INTO resp. APPENDING addition, the entries in the SELECTstatement define which data should be read by the database in which form. This requirement is translated in the database interface for the database system´s programming interface and is then passed to the database system. The data are read in packets by the database and are transported to the application server by the database server. On the application server, the data are transferred to the ABAP program´s data objects in accordance with the data specified in the INTO and APPENDING additions.
System Fields
The SELECT statement sets the values of the system fields sy-subrc and sy-dbcnt.
sy-subrc Relevance
0 The SELECT statement sets sy-subrc to 0 for every pass by value to an ABAP data object. The ENDSELECT statement sets sy-subrc to 0 if at least one row was transferred in the SELECT loop.
4 The SELECT statement sets sy-subrc to 4 if the result set is empty, that is, if no data was found in the database.
8 The SELECT statement sets sy-subrc to 8 if the FOR UPDATE addition is used in result, without the primary key being specified fully after WHERE.
After every value that is transferred to an ABAP data object, the SELECT statement sets sy-dbcnt to the number of rows that were transferred. If the result set is empty, sy-dbcnt is set to 0.
Notes
Outside classes, you do not need to specify the target area with INTO or APPENDING if a single database table or a single view is specified statically after FROM, and a table work area dbtab was declared with the TABLES statement for the corresponding database table or view. In this case, the system supplements the SELECT-statement implicitly with the addition INTO dbtab.
Although the WHERE-condition is optional, you should always specify it for performance reasons, and the result set should not be restricted on the application server.
SELECT-loops can be nested. For performance reasons, you should check whether a join or a sub-query would be more effective.
Within a SELECT-loop you cannot execute any statements that lead to a database commit and consequently cause the corresponding database cursor to close.
SELECT - result
Syntax
... lines columns ... .
Effect
The data in result defines whether the resulting set consists of multiple rows (table-like structure) or a single row ( flat structure). It specifies the columns to be read and defines their names in the resulting set. Note that column names from the database table can be changed. For single columns, aggregate expressions can be used to specify aggregates. Identical rows in the resulting set can be excluded, and individual rows can be protected from parallel changes by another program.
The data in result consists of data for the rows lines and for the columns columns.
SELECT - lines
Syntax
... { SINGLE }
| { { } } ... .
Alternatives:
1. ... SINGLE
2. ... { }
Effect
The data in lines specifies that the resulting set has either multiple lines or a single line.
Alternative 1
... SINGLE
Effect
If SINGLE is specified, the resulting set has a single line. If the remaining additions to the SELECT command select more than one line from the database, the first line that is found is entered into the resulting set. The data objects specified after INTO may not be internal tables, and the APPENDING addition may not be used.
An exclusive lock can be set for this line using the FOR UPDATE addition when a single line is being read with SINGLE. The SELECT command is used in this case only if all primary key fields in logical expressions linked by AND are checked to make sure they are the same in the WHERE condition. Otherwise, the resulting set is empty and sy-subrc is set to 8. If the lock causes a deadlock, an exception occurs. If the FOR UPDATE addition is used, the SELECT command circumvents SAP buffering.
Note
When SINGLE is being specified, the lines to be read should be clearly specified in the WHERE condition, for the sake of efficiency. When the data is read from a database table, the system does this by specifying comparison values for the primary key.
Alternative 2
Effect
If SINGLE is not specified and if columns does not contain only aggregate expressions, the resulting set has multiple lines. All database lines that are selected by the remaining additions of the SELECT command are included in the resulting list. If the ORDER BY addition is not used, the order of the lines in the resulting list is not defined and, if the same SELECT command is executed multiple times, the order may be different each time. A data object specified after INTO can be an internal table and the APPENDING addition can be used. If no internal table is specified after INTO or APPENDING, the SELECT command triggers a loop that has to be closed using ENDSELECT.
If multiple lines are read without SINGLE, the DISTINCT addition can be used to exclude duplicate lines from the resulting list. If DISTINCT is used, the SELECT command circumvents SAP buffering. DISTINCT cannot be used in the following situations:
If a column specified in columns has the type STRING, RAWSTRING, LCHAR or LRAW
If the system tries to access pool or cluster tables and single columns are specified in columns.
Note
When specifying DISTINCT, note that you have to carry out sort operations in the database system for this.
SELECT - columns
Syntax
| { {col1|aggregate( col1 )}
{col2|aggregate( col2 )} ... }
| (column_syntax) ... .
Alternatives:
1. ... *
2. ... {col1|aggregate( col1 )}
{col2|aggregate( col2 )} ...
3. ... (column_syntax)
Effect
The input in columns determines which columns are used to build the resulting set.
Alternative 1
Effect
If * is specified, the resulting set is built based on all columns in the database tables or views specified after FROM, in the order given there. The columns in the resulting set take on the name and data type from the database tables or views. Only one data object can be specified after INTO.
Note
If multiple database tables are specified after FROM, you cannot prevent multiple columns from getting the same name when you specify *.
Alternative 2
... {col1|aggregate( col1 )}
{col2|aggregate( col2 )} ...
Effect
A list of column labels col1 col2 ... is specified in order to build the resulting list from individual columns. An individual column can be specified directly or as an argument of an aggregate function aggregate. The order in which the column labels are specified is up to you and defines the order of the columns in the resulting list. Only if a column of the type LCHAR or LRAW is listed does the corresponding length field also have to be specified directly before it. An individual column can be specified multiple times.
The addition AS can be used to define an alternative column name a1 a2 ... with a maximum of fourteen digits in the resulting set for every column label col1 col2 .... The system uses the alternative column name in the additions INTO|APPENDING CORRESPONDING FIELDS and ORDER BY. .
Column labels
The following column labels are possible:
If only a single database table or a single view is specified after FROM, the column labels in the database table - that is, the names of the components comp1 comp2... - can be specified directly for col1 col2 ... in the structure of the ABAP Dictionary.
If the name of the component occurs in multiple database tables of the FROM addition, but the desired database table or the view dbtab is only specified once after FROM, the names dbtab~comp1 dbtab~comp2 ... have to be specified for col1 col2 .... comp1 comp2 ... are the names of the components in the structure of the ABAP Dictionary.
If the desired database table or view occurs multiple times after FROM, the names tabalias~comp1 tabalias~comp2 ... have to be specified for col1 col2 .... tabalias is the alternative table name of the database table or view defined after FROM, and comp1 comp2 ... are the names of the components in the structure of the ABAP Dictionary.
The data type of a single column in the resulting list is the datatype of the corresponding component in the ABAP Dictionary. The corresponding data object after INTO or APPENDING has to be selected accordingly.
Note
If multiple database tables are specified after FROM, you can use alternative names when specifying single columns to avoid having multiple columns with the same name.
Example
Read specific columns of a single row.
DATA wa TYPE spfli.
SELECT SINGLE carrid connid cityfrom cityto
INTO CORRESPONDING FIELDS OF wa
FROM spfli
WHERE carrid EQ 'LH' AND connid EQ '0400'.
IF sy-subrc EQ 0.
WRITE: / wa-carrid, wa-connid, wa-cityfrom, wa-cityto.
ENDIF.
Alternative 3
... (column_syntax)
Effect
Instead of static data, a data object column_syntax in brackets can be specified, which, when the command is executed, either contains the syntax shown with the static data, or is initial. The data object column_syntax can be a character-type data object or an internal table with a character-type data type. The syntax in column_syntax, like in the ABAP editor, is not case-sensitive. When specifying an internal table, you can distribute the syntax over multiple rows.
If column_syntax is initial when the command is executed, columns is implicitly set to * and all columns are read.
If columns are specificied dynamically without the SINGLE addition, the resulting set is always regarded as having multiple rows.
Notes
Before Release 6.10, you could only specify an internal table with a flat character-type row type for column_syntax with a maximum of 72 characters. Also, before Release 6.10, if you used the DISTINCT addition for dynamic access to pool tables or cluster tables, this was ignored, but since release 6.10, this causes a known exception.
If column_syntax is an internal table with header line, the table body and not the header line is evaluated.
Example
Read out how many flights go to and from a city. The SELECT command is implemented only once in a sub-program. The column data, including aggregate function and the data after GROUP BY, is dynamic. Instead of adding the column data to an internal l_columns table, you could just as easily concatenate it in a character-type l_columns field.
PERFORM my_select USING `CITYFROM`.
ULINE.
PERFORM my_select USING `CITYTO`.
FORM my_select USING l_group TYPE string.
DATA: l_columns TYPE TABLE OF string,
l_container TYPE string,
l_count TYPE i.
APPEND l_group TO l_columns.
APPEND `count( * )` TO l_columns.
SELECT (l_columns)
FROM spfli
INTO (l_container, l_count)
GROUP BY (l_group).
WRITE: / l_count, l_container.
ENDSELECT.
ENDFORM.
SELECT - aggregate
Syntax
... { MAX( col )
| MIN( col )
| AVG( col )
| SUM( col )
| COUNT( DISTINCT col )
| COUNT( * )
| count(*) } ... .
Effect
As many of the specified column labels as you like can be listed in the SELECT command as arguments of the above aggregate expression. In aggregate expressions, a single value is calculated from the values of multiple rows in a column as follows (note that the addition DISTINCT excludes double values from the calculation):
MAX( col ) Determines the maximum value of the value in the column col in the resulting set or in the current group.
MIN( col ) Determines the minimum value of the content of the column col in the resulting set or in the current group.
AVG( col ) Determines the average value of the content of the column col in the resulting set or in the current group. The data type of the column has to be numerical.
SUM( col ) Determines the sum of the content of the column col in the resulting set or in the current group. The data type of the column has to be numerical.
COUNT( DISTINCT col ) Determines the number of different values in the column col in the resulting set or in the current group.
COUNT( * ) (or count(*)) Determines the number of rows in the resulting set or in the current group. No column label is specified in this case.
If you are using aggregate expressions, all column labels that are not listed as an argument of an aggregate function are listed after the addition GROUP BY. The aggregate functions evaluate the content of the groups defined by GROUP BY in the database system and transfer the result to the combined rows of the resulting set.
The data type of aggregate expressions with the function MAX, MIN or SUM is the data type of the corresponding column in the ABAP Dictionary. Aggregate expressions with the function AVG have the data type FLTP, and those with COUNT have the data type INT4. The corresponding data object after INTO or APPENDING has to be selected accordingly.
Note the following points when using aggregate expressions:
If the addition FOR ALL ENTRIES is used in front of WHERE, or if cluster or pool tables are listed after FROM, no other aggregate expressions apart from COUNT( * ) can be used.
Columns of the type STRING or RAWSTRING cannot be used with aggregate functions.
When aggregate expressions are used, the SELECT command makes it unnecessary to use SAP buffering.
Null values are not included in the calculation for the aggregate functions. The result is a null value only if all the rows in the column in question contain the null value.
If only aggregate expressions are used after SELECT, the results set has one row and the addition GROUP BY is not necessary. If a non-table type target area is specified after INTO, the command ENDSELECT cannot be used together with the addition SINGLE. If the aggregate expression count( * ) is not being used, an internal table can be specified after INTO, and the first row of this table is filled.
If aggregate functions are used without GROUP BY being specified at the same time, the resulting set also contains a row if no data is found in the database. If count( * ) is used, the column in question contains the value 0. The columns in the other aggregate functions contain initial values. This row is assigned to the data object specified after INTO, and unless count( * ) is being used exclusively, sy-subrc is set to 0 and sy-dbcnt is set to 1. If count( *) is used exclusively, the addition INTO can be omitted and if no data can be found in the database, sy-subrc is set to 4 and sy-dbcnt is set to 0.
if helpful reward points -
Design a procedure which returns a result set of a select Query
Hi...
Can some one help me out with a brief design or work around for creating a stored procedure which runs a select Query and Returns a result set...
If not a stored procedure, at least a function which makes the job simple....
Awaiting help in this regard ........Hi...
I am sorry for providing insufficient Info...
Actually I am using Oracle 10G DB...
I have a select Query..
Since I am a part of team which is building a Complete Data Driven site, Even an SQL Query and a PL/SQL function body was stored in the Table itself to bring in some kind of Dynamism in the site.... But the master table was loaded with a lot of data and hence Now we decided to Store everythin in a generic package..
I used REF CURSORS to store a result set of a simple SELECT Query.... and declaring it as an out parameter in my Procedure body so that the JAVA team can directly access the Procedure from the JAVA layer....
Now I want to know can I do anything more efficient to carry out the above operation.... -
Complex select query read in Java
I want to use a custom complex select query with join of multiple tables Explicitly to read the object which itself is associated with other object through one-to-many mapping. The objects have been generated through Toplink without Indirection.
The scenario is like this:
Table: Purchase_Order Object: PurchaseOrder
2nd Table: Purchase_Order_Line Object: PurchaseOrderLine
Relationship is one-to-many between Purchase_Order and Purchase_Order_Line. Corresponding to this, PurchaseOrder has the Collection of PurchaseOrderLine without indirection.
I want to override the internal approach of Toplink by my custom select query to fetch a few attributes only. I tried it in some way but it does not return me PurchaseOrderLine collection.
Please elaborate what should be the approach to run such query in Java using Toplink API?
Thanks in advance!Could you include the query that you have currently tried.
TopLink 9.0.4 did not support joining 1-m relationships, so this would not be possible, but TopLink 10.1.3 did add this support. You would need to add the 1-m joined attribute to the query to be able to use SQL that joins the 1-m relationship.
In terms of only selecting partial objects, you would need to enable partial object reading on the query to only have some of the object's attributes built, but I believe that 1-m joins are not currently supported for partial object reading.
You may also consider using batch reading on the 1-m in TopLink, as batch reading is more efficient at reading 1-m relationships than joining. -
SELECT query performance issue
Hello experts!!!
I am facing the performance issue in the below SELECT query. Its taking long time to execute this query.
Please suggest how can i improve the performance of this query.
SELECT MBLNR MATNR LIFNR MENGE WERKS BUKRS LGORT BWART INTO CORRESPONDING FIELDS OF TABLE IT_MSEG
FROM MSEG
WHERE MATNR IN S_MATNR
AND LIFNR IN S_LIFNR
AND WERKS IN S_WERKS
AND BUKRS IN S_BUKRS
AND XAUTO = ''
AND BWART IN ('541' , '542' , '543' , '544', '105' , '106').
Thanks in advance.
Regards
AnkurHi Ankur,
the MSEG index for material is
Index MSEG~M
MANDT
MATNR
WERKS
LGORT
BWART
SOBKZ
It could be used very efficient if you supply values for MATNR, WERKS and LGORT.
There is no index on LIFNR. IKf you want the data for specific vendor(s), you should select from EKKO first, ir has index Index EKKO~1
MANDT
LIFNR
EKORG
EKGRP
BEDAT
You can JOIN EKKO and EKBE to get the BSEG key fields GJAHR BELNR BUZEI directly.
I don't know your details but I think you can get all you need from EKKO and EKBE. You may also consider EKPO as is has a material index Index EKPO~1
MANDT
MATNR
WERKS
BSTYP
LOEKZ
ELIKZ
MATKL
Do you really need the (much bigger) MSEG?
Regards,
Clemens -
How to run batch select query ?
I have multiple "select" query .
how do i run the query in a efficient way and absorp the values into an ArrayList ?
addbatch() method is mainly used for "insert" kind of query .
and also , it would be bad idea to run "select:" query one by one .
can you tell whats the best use ?Are your queries related to each other, I mean, do you have something like
select xpto from someTable where someValue = 1
select xpto from someTable where someValue = 2
select xpto from someTable where someValue = 3
If it's something like this you can group
select xpto from someTable where someValue in(1,2,3)
If it is not I think there's no other way but running one at a time.
mleiria -
Hi Experts,
I am having a select query in which I am using a variable in the where condition but it is giving error. Please suggest how to use variable in the select query.
The query I am using is a s below.
select * from zexc_rec into table it_ZEXC_REC
where
LIFNR in S_LIFNR and
DOCNO in S_DOCNO and
DOCTYP in doc_typ and
DATE1 in S_DATE1 and
MATNR in S_MATNR.
Here doc_typ is a variable.
Thanks.Rahul,
use RANGES type variable instead of variable . It acts as a select-options variable. Thn use this variable in SELECT query with IN.
Eg :
RANGES r_t510 FOR t510-lgart.
r_t510-low = '1600'.
APPEND r_t510.
r_t510-low = '3190'.
APPEND r_t510.
Note : can be use SIGN, OPTIONS properties too in RANGES type.
More deatils go through on HELP of RANGES
Rgds,
Ranjith
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