Queries executed on generic buffered tables form table structure?!
Hi,
generic buffered tables only store parts in the buffer that were queried or rather are queried. Thus the WHERE clause of an SQL stmt defines which parts of a table to store, when a part is read for the first time.
An example:
A table has 3 key fields. I execute a first query and parametrize two of the key fields. Now a generic region is loaded into to buffer corresponding to the two parametrized key fields.
If I execute another query attaching only the first key field within my query, what will happen, if we assume that the key field is parametrized with the same content like in the first query?
Will there be one big and one smaller region holding the same data like the big one?
Hi Holger ,
Queries which donot fully parametrize the generic key will not load / reload the buffer .
Say Table has 5 Keys, you define generic key as 3.
Queries which have parametrized 3 or more key will load / reload the buffer . If you only parametrize 2 keys it will not load the buffer . Different key combinations of first three keys will exist as different generic areas in buffer .
Check this
http://help.sap.com//saphelp_470/helpdata/EN/cf/21eab8446011d189700000e8322d00/frameset.htm
<b>It is also possible that too many accesses will bypass the buffer and go directly to the database, <u>since they do not fully define the generic key of the table</u>.</b>
Cheers
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PreethaHi,
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Audit, Trigger and custom profiler can be used.
Balmukund Lakhani
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Buffering table not up to date error message when creating a Cart
Hi Folks,
We are getting a 'Buffering table not up to date' error message when attempting to create a Cart. The error message only happens to the one end user ID only with the others not getting this error, therefore suggesting that my SRM org plan set-up is correct.
Has anyone come across this previously and what checks are available in the system to resolve this? As mentioned, the attribute check is okay and I have also removed the user ID from the SRM org plan and reassigned again but this has not corrected the problem. We are on SRM 5.
Thanks. Mike.
Message:
Buffering table not up to date
Method: GET_STRUCTURE_PATHS_UP of program CL_BBP_ES_EMPLOYEE_MYS========CP
Method: IF_BBP_ES_EMPLOYEE~GET_RL_UNIT_IDS of program CL_BBP_ES_EMPLOYEE_MYS========CP
Method: IF_BBP_ES_PROFESSIONAL~GET_WORKPLACE_ADDRESS_IDS of program CL_BBP_ES_EMPLOYEE_MYS========CP
Method: IF_BBP_ES_PROFESSIONAL~GET_WORKPLACE_ADDRESS_ID of program CL_BBP_ES_EMPLOYEE_MYS========CP
Method: IF_BBP_ES_PROFESSIONAL~GET_WORKPLACE_ADDRESS of program CL_BBP_ES_EMPLOYEE_MYS========CP
Form: USER_DETAIL_GET of program SAPLBBP_SC_APP
Form: GLOBAL_FILL of program SAPLBBP_SC_APP
Form: SC_INIT of program SAPLBBP_SC_APP
Function: BBP_SC_APP_EVENT_DISPATCHER of program SAPLBBP_SC_APP
Form: APP_EVENT_HANDLER of program SAPLBBP_SC_UI_ITS
Edited by: Mike Pallister on Nov 5, 2008 11:44 AMPlease advise on this problem. When I try to check the Approval Overview tab for these two shopping carts.
I got a dump.can anyone help me.
Information on where terminated
Termination occurred in the ABAP program "CL_BBP_ES_EMPLOYEE_MYS========CP" -
in "IF_BBP_ES_EMPLOYEE~GET_RL_UNIT_IDS".
The main program was "SAPMHTTP ".
In the source code you have the termination point in line 35
of the (Include) program "CL_BBP_ES_EMPLOYEE_MYS========CM008".
The termination is caused because exception "CX_BBP_ES_INTERNAL_ERROR" occurred
in
procedure "/SAPSRM/IF_PDO_DO_APV_EXT~GET_AGENT_DETAILS" "(METHOD)", but it was
neither handled locally nor declared
in the RAISING clause of its signature.
The procedure is in program "/SAPSRM/CL_PDO_DO_APV_EXT=====CP "; its source
code begins in line
1 of the (Include program "/SAPSRM/CL_PDO_DO_APV_EXT=====CM00E ". -
How to improve speed of queries that use ORM one table per concrete class
Hi,
Many tools that make ORM (Object Relational Mapping) like Castor, Hibernate, Toplink, JPOX, etc.., have the one table per concrete class feature that maps objects to follow structure:
CREATE TABLE ABSTRACTPRODUCT (
ID VARCHAR(8) NOT NULL,
DESCRIPTION VARCHAR(60) NOT NULL,
PRIMARY KEY(ID)
CREATE TABLE PRODUCT (
ID VARCHAR(8) NOT NULL REFERENCES ABSTRACTPRODUCT(ID),
CODE VARCHAR(10) NOT NULL,
PRICE DECIMAL(12,2),
PRIMARY KEY(ID)
CREATE UNIQUE INDEX iProduct ON Product(code)
CREATE TABLE BOOK (
ID VARCHAR(8) NOT NULL REFERENCES PRODUCT(ID),
AUTHOR VARCHAR(60) NOT NULL,
PRIMARY KEY (ID)
CREATE TABLE COMPACTDISK (
ID VARCHAR(8) NOT NULL REFERENCES PRODUCT(ID),
ARTIST VARCHAR(60) NOT NULL,
PRIMARY KEY(ID)
there is a way to improve queries like
SELECT
pd.code CODE,
abpd.description DESCRIPTION,
DECODE(bk.id,NULL,cd.artist,bk.author) PERSON
FROM
ABSTRACTPRODUCT abpd,
PRODUCT pd,
BOOK bk,
COMPACTDISK cd
WHERE
pd.id = abpd.id AND
bk.id(+) = abpd.id AND
cd.id(+) = abpd.id AND
pd.code like '101%'
or like this:
SELECT
pd.code CODE,
abpd.description DESCRIPTION,
DECODE(bk.id,NULL,cd.artist,bk.author) PERSON
FROM
ABSTRACTPRODUCT abpd,
PRODUCT pd,
BOOK bk,
COMPACTDISK cd
WHERE
pd.id = abpd.id AND
bk.id(+) = abpd.id AND
cd.id(+) = abpd.id AND
abpd.description like '%STARS%' AND
pd.price BETWEEN 1 AND 10
think in a table with many rows, then exists something inside MaxDB to improve this type of queries? like some anotations on SQL? or declare tables that extends another by PK? on other databases i managed this using Materialized Views, but i think that this can be faster just using PK, i'm wrong? the better is to consolidate all tables in one table? what is the impact on database size with this consolidation?
note: with consolidation i will miss NOT NULL constraint at database side.
thanks for any insight.
ClóvisHi Lars,
i dont understand because the optimizer get that Index for TM at execution plan, and because dont use the join via KEY column, note the WHERE clause is "TM.OID = MF.MY_TIPO_MOVIMENTO" by the key column, and the optimizer uses an INDEX that the indexed column is ID_SYS, that isnt and cant be a primary key, because its not UNIQUE, follow the index columns:
indexes of TipoMovimento
INDEXNAME COLUMNNAME SORT COLUMNNO DATATYPE LEN INDEX_USED FILESTATE DISABLED
ITIPOMOVIMENTO TIPO ASC 1 VARCHAR 2 220546 OK NO
ITIPOMOVIMENTO ID_SYS ASC 2 CHAR 6 220546 OK NO
ITIPOMOVIMENTO MY_CONTA_DEBITO ASC 3 CHAR 8 220546 OK NO
ITIPOMOVIMENTO MY_CONTA_CREDITO ASC 4 CHAR 8 220546 OK NO
ITIPOMOVIMENTO1 ID_SYS ASC 1 CHAR 6 567358 OK NO
ITIPOMOVIMENTO2 DESCRICAO ASC 1 VARCHAR 60 94692 OK NO
after i create the index iTituloCobrancaX7 on TituloCobranca(OID,DATA_VENCIMENTO) in a backup instance and get surprised with the follow explain:
OWNER TABLENAME COLUMN_OR_INDEX STRATEGY PAGECOUNT
TC ITITULOCOBRANCA1 RANGE CONDITION FOR INDEX 5368
DATA_VENCIMENTO (USED INDEX COLUMN)
MF OID JOIN VIA KEY COLUMN 9427
TM OID JOIN VIA KEY COLUMN 22
TABLE HASHED
PS OID JOIN VIA KEY COLUMN 1350
BOL OID JOIN VIA KEY COLUMN 497
NO TEMPORARY RESULTS CREATED
JDBC_CURSOR_19 RESULT IS COPIED , COSTVALUE IS 988
note that now the optimizer gets the index ITITULOCOBRANCA1 as i expected, if i drop the new index iTituloCobrancaX7 the optimizer still getting this execution plan, with this the query executes at 110 ms, with that great news i do same thing in the production system, but the execution plan dont changes, and i still getting a long execution time this time at 413516 ms. maybe the problem is how optimizer measure my tables.
i checked in DBAnalyser that the problem is catalog cache hit rate (we discussed this at [catalog cache hit rate, how to increase?|;
) and the low selectivity of this SQL command, then its because of this that to achieve a better selectivity i must have an index with, MF.MY_SACADO, MF.TIPO and TC.DATA_VENCIMENTO, as explained in previous posts, since this type of index inside MaxDB isnt possible, i have no choice to speed this type of query without changing tables structure.
MaxDB developers can develop this type of index? or a feature like this dont have any plans to be made?
if no, i must create another schema, to consolidate tables to speed queries on my system, but with this consolidation i will get more overhead, i must solve the less selectivity because i think if the data on tables increase, the query becomes impossible, i see that CREATE INDEX supports FUNCTION, maybe a FUNCTION that join data of two tables can solve this?
about instance configuration it is:
Machine:
Version: '64BIT Kernel'
Version: 'X64/LIX86 7.6.03 Build 007-123-157-515'
Version: 'FAST'
Machine: 'x86_64'
Processors: 2 ( logical: 8, cores: 8 )
data volumes:
ID MODE CONFIGUREDSIZE USABLESIZE USEDSIZE USEDSIZEPERCENTAGE DROPVOLUME TOTALCLUSTERAREASIZE RESERVEDCLUSTERAREASIZE USEDCLUSTERAREASIZE PATH
1 NORMAL 4194304 4194288 379464 9 NO 0 0 0 /db/SPDT/data/data01.dat
2 NORMAL 4194304 4194288 380432 9 NO 0 0 0 /db/SPDT/data/data02.dat
3 NORMAL 4194304 4194288 379184 9 NO 0 0 0 /db/SPDT/data/data03.dat
4 NORMAL 4194304 4194288 379624 9 NO 0 0 0 /db/SPDT/data/data04.dat
5 NORMAL 4194304 4194288 380024 9 NO 0 0 0 /db/SPDT/data/data05.dat
log volumes:
ID CONFIGUREDSIZE USABLESIZE PATH MIRRORPATH
1 51200 51176 /db/SPDT/log/log01.dat ?
parameters:
KERNELVERSION KERNEL 7.6.03 BUILD 007-123-157-515
INSTANCE_TYPE OLTP
MCOD NO
_SERVERDB_FOR_SAP YES
_UNICODE NO
DEFAULT_CODE ASCII
DATE_TIME_FORMAT ISO
CONTROLUSERID DBM
CONTROLPASSWORD
MAXLOGVOLUMES 2
MAXDATAVOLUMES 11
LOG_VOLUME_NAME_001 /db/SPDT/log/log01.dat
LOG_VOLUME_TYPE_001 F
LOG_VOLUME_SIZE_001 6400
DATA_VOLUME_NAME_0005 /db/SPDT/data/data05.dat
DATA_VOLUME_NAME_0004 /db/SPDT/data/data04.dat
DATA_VOLUME_NAME_0003 /db/SPDT/data/data03.dat
DATA_VOLUME_NAME_0002 /db/SPDT/data/data02.dat
DATA_VOLUME_NAME_0001 /db/SPDT/data/data01.dat
DATA_VOLUME_TYPE_0005 F
DATA_VOLUME_TYPE_0004 F
DATA_VOLUME_TYPE_0003 F
DATA_VOLUME_TYPE_0002 F
DATA_VOLUME_TYPE_0001 F
DATA_VOLUME_SIZE_0005 524288
DATA_VOLUME_SIZE_0004 524288
DATA_VOLUME_SIZE_0003 524288
DATA_VOLUME_SIZE_0002 524288
DATA_VOLUME_SIZE_0001 524288
DATA_VOLUME_MODE_0005 NORMAL
DATA_VOLUME_MODE_0004 NORMAL
DATA_VOLUME_MODE_0003 NORMAL
DATA_VOLUME_MODE_0002 NORMAL
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DATA_VOLUME_GROUPS 1
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OPMSG1 /dev/console
OPMSG2 /dev/null
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CHECK_BACKUP NO
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CHECK_COMMON 0
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SUBTREE_LOCKS NO
MONITOR_READ 2147483647
MONITOR_TIME 2147483647
MONITOR_SELECTIVITY 0
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CALLSTACKLEVEL 0
OMS_RUN_IN_UDE_SERVER NO
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LOGABOVELIMIT 50L75L90M95M96H97H98H99H
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USESELECTFETCH YES
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UPDATESTAT_SAMPLE_ALGO 1
SIMULATE_VECTORIO IF_OPEN_DIRECT_OR_RAW_DEVICE
COLUMNCOMPRESSION YES
TIME_MEASUREMENT NO
CHECK_TABLE_WIDTH NO
MAX_MESSAGE_LIST_LENGTH 100
SYMBOL_RESOLUTION YES
PREALLOCATE_IOWORKER NO
CACHE_IN_SHARED_MEMORY NO
INDEX_LEAF_CACHING 2
NO_SYNC_TO_DISK_WANTED NO
SPINLOCK_LOOP_COUNT 30000
SPINLOCK_BACKOFF_BASE 1
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ROW_LOCKS_PER_TRANSACTION 50
USEUNICODECOLUMNCOMPRESSION NO
about send you the data from tables, i dont have permission to do that, since all data is in a production system, the customer dont give me the rights to send any information. sorry about that.
best regards
Clóvis -
MSS - Unable to work teamviewer with generic view table iview
Hi Portal experts !
I work on a portal migration project from EP5 to EP6 and I have a problem to work together a "teamviewer" iview and a "generic view table" iview.
The teamviewer displays all my employees and when I click on a employee, the "generic view table" iview must display me his/her career in the company (the iview execute a SAP query with in input the personal ID of the selected employee).
On EP5, it is working.
But on EP6, it is not working. I have no error message displayed but it throughs me on the first folder of the test portal role I have created.
I have used the same templates from EP5 to create EP6 iviews.
There are few parameters on each iviews, so I don't know where can be the origin of problem :/.
If you have any clue, it would be great !
Thanks by advance
Best regards,
NicolasI've found the solution: I have to set the "isolation method" property to "Pumped" for the iView which catches the event launched by the teamviewer.
What is looked strange is that isolation method is deprecated
Hope that it will help someone on this subject.
Nicolas -
Inner join on Buffred table and not buffered table.
Hi guys,
Can you suggest me how can i write select query using inner join on buffered table and not buffered table. i written like this. is it right?
SELECT a~vbeln
a~vkorg
a~kunnr
a~kunag
a~wadat_ist
a~xblnr
b~bukrs
FROM likp AS a INNER JOIN tvko AS b
ON avkorg = bvkorg BYPASSING BUFFER
INTO TABLE itab_likp
WHERE vbeln = s_vbeln.
Thanks.
RAJHi Raj ,
Please find below my Commentes :
1. When you use "Bypassing buffer" clause in Select statement , the data what is there in the buffer of application sever is always ignored and Read is performed from the Physical database always. This Clause is advisable where you require realtime data (Not recommended generally in reporting)
2. It is advisable that you should not use small table in the innerjoin with big table. In the query you have written there are 2 tables:- LIKP and TVKO outof which TVKO is a master table containing very few records than LIKP (Contains huge data for Delivery header).
So my recommendation will be : -
1. Eliminate the "Bypassing Buffer" clause from your Query
2. Break the select query into 2 select queries breaking the join and with some ABAP logic populate the Internal table "itab_likp".
This will be optimum way inwhich you can write the select query for your senarion. Also Ensure that indexes are being used for better selectivity.
Hope this will help to you.
Regards,
Nikhil -
Error while insert data using execute immediate in dynamic table in oracle
Error while insert data using execute immediate in dynamic table created in oracle 11g .
first the dynamic nested table (op_sample) was created using the executed immediate...
object is
CREATE OR REPLACE TYPE ASI.sub_mark AS OBJECT (
mark1 number,
mark2 number
t_sub_mark is a class of type sub_mark
CREATE OR REPLACE TYPE ASI.t_sub_mark is table of sub_mark;
create table sam1(id number,name varchar2(30));
nested table is created below:
begin
EXECUTE IMMEDIATE ' create table '||op_sample||'
(id number,name varchar2(30),subject_obj t_sub_mark) nested table subject_obj store as nest_tab return as value';
end;
now data from sam1 table and object (subject_obj) are inserted into the dynamic table
declare
subject_obj t_sub_mark;
begin
subject_obj:= t_sub_mark();
EXECUTE IMMEDIATE 'insert into op_sample (select id,name,subject_obj from sam1) ';
end;
and got the below error:
ORA-00904: "SUBJECT_OBJ": invalid identifier
ORA-06512: at line 7
then when we tried to insert the data into the dynam_table with the subject_marks object as null,we received the following error..
execute immediate 'insert into '||dynam_table ||'
(SELECT887684 wrote:
ORA-00904: "SUBJECT_OBJ": invalid identifier
ORA-06512: at line 7The problem is that your variable subject_obj is not in scope inside the dynamic SQL you are building. The SQL engine does not know your PL/SQL variable, so it tries to find a column named SUBJECT_OBJ in your SAM1 table.
If you need to use dynamic SQL for this, then you must bind the variable. Something like this:
EXECUTE IMMEDIATE 'insert into op_sample (select id,name,:bind_subject_obj from sam1) ' USING subject_obj;Alternatively you might figure out to use static SQL rather than dynamic SQL (if possible for your project.) In static SQL the PL/SQL engine binds the variables for you automatically. -
How to use single buffered table with FOR ALL ENTRIES KEYWORD
Hai,
I'm Using TJ02T Database table, It is single buffered table but at the same time I want to use FOR ALL ENTRIES KEYWORD , Please Help me.
Regards,
S.JananiHi,
FOR ALL ENTRIES will not depend on the buffering nature of the table. The single buffered table will only only buffer one record into memory. You can still use the statement to query the values, but it may have performance problems if the data volume is high since the records are not completely buffered into memory, the time will spent in getting data from DB.
Thanks..
Preetham S -
Generic extraction (table,view,functionmodule)
hi
In generic Extaction when we use table and view and function module and sap qu (scenario)
AND
plz send some examples
Please search the forums before postingHi,
when Standard Extractors are not supporting to your requirement then we go with Generic Extraction.
Here we have Three different types to design generic extractors
Table
View
Function Module
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/a0f46157-e1c4-2910-27aa-e3f4a9c8df33
https://websmp103.sap-ag.de/~sapidb/011000358700007535452002
Hope this will help you.
Thanks
Prasad -
Anybody please resolve my doubt
types tb_std_type type table of sflight.
-->this i understand as not a generic table type.'NON-UNIQUE" and DEFAULT KEYS are implicity defined .
data it_std type tb_std.-->Since i could declare an internal table of tb_std_type,i strongly belive tb_std_type is not a genric table type.
But when i try to declare another type of same table type tb_std_type ie
types tb2_type type tb_std_type.
This is giving me an error saying\
tb_std_type has a generic type.Use of this type is only possible for typing field symbols and formal parameters.
If thats true then how was i able to create a internal table out of it...
In case of sorted and hashed tables it behaves as exactly as it is defined.(Like if generic,can only be used for typing formal params.field symbold..and if non generic--internal tables declaration and normal typing is possible)
Please resolve this
*Would be great if could avoid a copy paste from std.help..because i have been through it..Hello Teenu,
Query#1
types tb2_type type tb_std_type.
This is giving me an error saying\
tb_std_type has a generic type.Use of this type is only possible for typing field symbols and formal parameters.
Why is the table generic? An excerpt from SAP documentation clearly states that:
An internal table that has no table key or an incomplete table key is generic with respect to the table key. A table type of this nature can be used only for typing formal parameters or field symbols.
Query#2
If thats true then how was i able to create a internal table out of it...
SAP says:
A standard table type with a generic primary table key can only be specified after TYPE when DATA is used.
Source: [http://help.sap.com/abapdocu_70/en/ABAPTYPES_KEYDEF.htm|http://help.sap.com/abapdocu_70/en/ABAPTYPES_KEYDEF.htm]
BR,
Suhas -
Using execute immediate creating a table from another
hi friend i wanted to create a table from a select statement in a pl sql procedure. i am using execute immediate but getting problems with it pls can anyone help me.
here is the query i am using
EXECUTE IMMEDIATE 'CREATE TABLE table_name AS (SELECT * FROM a_view WHERE column_name LIKE '%some_string%');
i need to know if this can be done and if yes how. pls help me its bit urgent too. the schema name is same and the privileges are available to create tables too.Your syntax is wrong.
If you would use a syntax higlighted editor, it would show.
Yout try to execute a string where another string is embedded. Please use two times single quote or use the 'q' function:
This one is correct:
EXECUTE IMMEDIATE 'CREATE TABLE table_name AS (SELECT * FROM a_view WHERE column_name LIKE ''%some_string%'')';
or this one:
EXECUTE IMMEDIATE q'|CREATE TABLE table_name AS (SELECT * FROM a_view WHERE column_name LIKE '%some_string%')|';
good luck -
Few queries across the BSEG & REGUP tables.
Hi all.
Am hoping that you might be able to assist. I have a dataset that has a few tables from a SAP system & I have been asked to run a few queries across the BSEG & REGUP tables.
I have tried using EBELN, BELNR, AUFNR and REBZG to try and join the two tables but unfortunately these fields are not consistently populated. Is there any other fields that I could use that are common to both tables and should be populated by default ??
Any assistance that could be provided would be appreciated.Hi Ashutosh Kumar
You can join both table with
BUKRS - Company Code
BELNR - Accounting Docu. No.
GJAHR - Fiscal Year.
BSCHL - Posting Key.
SAKNR - G/L account number.
Reward Me Points .
Thanks
Pari -
Generic Internal Tables unassign
I am using a generic internal tables to get some data one by one. if i get it onece, how i make it to generic internal table again?
just like:
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = it_fldcat
IMPORTING
ep_table = em_str
EXCEPTIONS
generate_subpool_dir_full = 1
OTHERS = 2.
ASSIGN em_str->* TO <fs_table>.
TRY .
em_pyst = <fs_table>.
CATCH cx_sy_dyn_call_illegal_type .
ENDTRY.
and i'd like to use em_pyst again, but it already has the same structure of last <fs_table>. how can i make it correct?I am using a generic internal tables to get some data one by one. if i get it onece, how i make it to generic internal table again?
Not sure what is your point here.
First you create dyncamic table em_str . It already receives some structure which you determined in fieldcatalog. Than you have to dereference it (assign it to field symbol in order you can address it) ASSIGN em_str->* TO <fs_table> .
Finally you want to retrun this empty dynamically generated table to exporting parameter em_pyst . If this parameter is typed as any table it will take on the structure from your field symbol <fs_table> . I think for generic parameter this is the point to pass it generic TO function/method and receive it typed FROM the function.
If you clarify what exactly you want to achieve it will be easier to help you.
Regards
Marcin -
Hi all,
I am joining two buffered tables.Code inspector it is giving warning.what i need to do
regards,
rakesh.if it is not affecting your report result then ignore the warning
-
In which sequence are queries and sub-queries executed by the SQL Engine
In which sequence are queries and sub-queries executed by the SQL Engine?
Which is correct ?
a. primary query -> sub query -> sub sub query and so on
b. sub sub query -> sub query -> prime query
c. the whole query is interpreted at one time
d. there is no fixed sequence of interpretation, the query parser takes a decision on the flyIn which sequence are queries and sub-queries executed by the SQL Engine?
Which is correct ?
a. primary query -> sub query -> sub sub query and so on
b. sub sub query -> sub query -> prime query
c. the whole query is interpreted at one time
d. there is no fixed sequence of interpretation, the query parser takes a decision on the fly
Hi, below may help you understanding simple subquery & correlated subquery
refer :
http://sqlmag.com/t-sql/t-sql-starters-simple-and-correlated-subqueries
a) if it is correlated subquery
A correlated subquery is one that depends on a value in the outer query. In programming terms, you pass the subroutine an argument, then the subroutine evaluates the query and returns a result. You move on to the next record and repeat the process. The
net effect is that the subquery runs once for every row in the main query; this situation is inefficient.
A possible alternative is to rewrite the correlated subquery as a join. However,
some situations require a subquery. Eg- IN(with outer table refernce)
so main query -> subquery
b) if it is simple subquery
A subquery is a query that SQL Server must evaluate before it can process the main query, Eg- IN(with out outer table refernce)
so subquery-> main query
c) correlated query interpreted row by row with subquery, while subquery is interpreted at one time(outer table and inner table)
d) in most case it depends on the whether it is correlated subquery or simple subquery
Thanks
Saravana Kumar C
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