Tune query on dual table.

Hello,
I am using ORACLE 11g and RHEL 5.
I have a performance tuning issue.
One of the query which returns the output in 0.016 seconds i.e. the below one
select to_number((sysdate- to_date('1970-01-01 00:00:00','YYYY-MM-DD HH24:MI:SS')) * 86400 -
((substr(TZ_OFFSET(sessiontimezone),1,
instr(TZ_OFFSET(sessiontimezone),':')-1) * 3600)+((substr(TZ_OFFSET(SESSIONTIMEZONE),
(instr(TZ_OFFSET(sessiontimezone),':')+1), 2)*60)))) TIME_STAMP ,
to_number(to_char(systimestamp,'FF')) MICROSEC
from dualI want to optimize this query at such a extend that it should give the output in less than 10 microseconds
now this query returns the output in 0.016 seconds...which is way to more as per the need.
I can also adjust if the output time is constant all the time....
for ex:-
if the query returns the output in 15 microsecond when fired for the first time then it should return the output in 15 microsecond for all the consequential execution. If the query gets executed for 10 times then i should get the output in 15 microsecond for all the 10 times.
can anyone guide me how to tune this query to get the output in less than 10 microsecond ???
else
how can i execute this query to return the output in the same time at every execution ???
Thanks in advance ...

Hi,
VJ4 wrote:
can anyone guide me how to tune this query to get the output in less than 10 microsecond ???I don't think it is possible using a (disk based) database. Their purpose is not to measure time but to serve and manipulate relational data.
As far as i know, <10µs will be hard to achieve.
Maybe TimesTen IMDB (InMemoryDataBase) can do that...
but wouldn't warranty the constant exec time.
VJ4 wrote:
how can i execute this query to return the output in the same time at every execution ???Well, I don't think you can. The Oracle database is not real-time. The execution time will higly depends on several factors, like parsed query still in shared pool, database server not being too charged, etc...
More over : assuming the query will always execute at exactly the same "speed" in order to measure how fast you are processing unit is not a good idea, as it assumes your unit processing speed is constant.
I think you should try to explain the big picture, and how you came to decide you need a query that return in less than 10µs.
Tell us why you cannot just execute it one in a while, and do the usual math :
processing speed = ("units processed at T2" - "units processed at T1") / (T2 - T1)

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Sql query and dual table

Hi,
1. Do dual table take any physical space in the database or it is only logically present?
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Thanks,
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user3001930 wrote:
Hi,
1. Do dual table take any physical space in the database or it is only logically present?Dual table is physically stored. But starting from 10g (I guess) they indroduced the FAST DUAL access path. Which means if you use the DUAL table not to get the value from the table and only to select a constant value then it will not hit the actually table.
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user557052 wrote:
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hey
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COUNT(*)
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Doubt in DUAL TABLE

Hi,
below is one query
SQL> select * from dual;
D
XNow from the below Query I came to know that there is one field in the dual table DUMMY which is having VARCHAR2(1)
SQL> desc dual;
Name                                                  Null?    Type
DUMMY                                                          VARCHAR2(1)now my doubt is when I run the below query how it is displaying text more than 1 character
SQL> select 'how are you' from dual;
'HOWAREYOU'
how are youplease explain
thanks in advance.

Hi,
What you are SELECTing here nas no relation to any column in the table.
There's nothing special about the dual table regarding literals. Try
SELECT 'Hello'
FROM    scott.dept;Notice that scott.dept does not have any 5-character columns, yet a query on scott.dept is producing a 5-character column.
When you query a table, you don't have to SELECT all of the columns in the table. In fact, you don't have to SELECT any of the columns in the table, as you demonstrated.
The query you posted, like the query above, does not refer to any columns in its base table; it's not surprising that the output doesn't resemble any column in the base table. In the case of the query above, which is based on a table that has 3 columns, the one column that we are SELECTing can't have the characteristics of all 3 columns in the table. Which column do you think the output should resemble, and why? 'Hello' is the first column of output; does that mean it has to resemble the first column in the table, which happens to be defined as NUMBER (2)? 'Hello' is also the last column of output; does that mean it has to resemble the last column of the table? 'Hello' is directly in the center of the output; does that mean it has to resemble the column that happens to be in the middle of the table? Of course not!
Once agian, it is perfectly legal, and sometimes extremely useful, to have columns in a result set that have no connection at all to any column in the table.

Select query on a table with 13 million of rows

Hi guys,
I have been trying to perform a select query on a table which has 13 millions of entries however it took around 58 min to complete.
The table has 8 columns with 4 Primary keys looks like below:
(PK) SegmentID > INT
(PK) IPAddress > VARCHAR (45)
MAC Address > VARCHAR (45)
(PK) Application Name > VARCHAR (45)
Total Bytes > INT
Dates > VARCHAR (45)
Times > VARCHAR (45)
(PK) DateTime > DATETIME
The sql query format is :
select ipaddress, macaddress, sum(totalbytes), applicationname , dates,
times from appstat where segmentid = 1 and datetime between '2011-01-03
15:00:00.0' and '2011-01-04 15:00:00.0' group by ipaddress,
applicationname order by applicationname, sum(totalbytes) desc
Is there a way I can improve this query to be faster (through my.conf or any other method)?
Any feedback is welcomed.
Thank you.
Mus

Tolls wrote:
What db is this?
You never said.
Anyway, it looks like it's using the Primary Key to find the correct rows.
Is that the correct number of rows returned?
5 million?
Sorted?I am using MySQL. By the way, the query time has been much more faster (22 sec) after I changed the configuration file (based on my-huge.cnf).
The number of rows returned is 7999 Rows
This is some portion of the my.cnf
# The MySQL server
[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
skip-locking
key_buffer = 800M
max_allowed_packet = 1M
table_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 16M
log = /var/log/mysql.log
log-slow-queries = /var/log/mysqld.slow.log
long_query_time=10
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 6
Is there anything else I need to tune so it can be faster ?
Thanks a bunch.
Edited by: user578505 on Jan 17, 2011 6:47 PM

Dbms_xmlgen.newcontext query from multiple tables and ||

I have two questions
How do I get a dbms_xmlgen.context to query from multiple tables? I have been able to make it work with using one table only, but not with multiple tables.
And how to get the || (concat) to work within my query for my output to an xml file?
Here is my current query:
create or replace function get_xml return clob is
result clob;
qryctx dbms_xmlgen.ctxHandle;
SELECT DBMS_XMLGEN.getxml('select prefix, suffix, fiscal_yr
FROM rcv.recv_accessions ra
where ra.prefix = 8 and ra.fiscal_yr = 11')xml into result FROM dual;
result := DBMS_XMLGEN.getXML(qryCtx);
This is what I desire:
SELECT DBMS_XMLGEN.getxml('select ra.prefix||'-'|| ra.suffix||'-'|| ra.fiscal_yr accession, ss.date_in, st.test
FROM rcv.recv_accessions ra, ser.sero_samples ss, ser.sero_tests st
where ra.prefix = 8 and ra.fiscal_yr = 11 and ss.raid = ra.id and st.ssid = ss.id')xml into result FROM dual;
On this both the reference to multiple tables and the concat function cause errors.
Thank you
Edited by: user583094 on Mar 2, 2011 3:36 PM

Hi,
for the concat do I use xmlconcat?No, XMLConcat is used to concatenate XMLType fragments.
The || operator will do fine, but you must escape any single quote inside the string :
SELECT DBMS_XMLGEN.getxml(
'SELECT ra.prefix ||''-''|| ra.suffix ||''-''|| ra.fiscal_yr as accession,
        ss.date_in,
        st.test
FROM rcv.recv_accessions ra,
      ser.sero_samples ss,
      ser.sero_tests st
WHERE ra.prefix = 8
AND ra.fiscal_yr = 11
AND ss.raid = ra.id
AND st.ssid = ss.id'
INTO result
FROM dual;Or, use the quoting operator to define a custom string delimiter :
SELECT DBMS_XMLGEN.getxml(
q'{SELECT ra.prefix ||'-'|| ra.suffix ||'-'|| ra.fiscal_yr as accession,
        ss.date_in,
        st.test
FROM rcv.recv_accessions ra,
      ser.sero_samples ss,
      ser.sero_tests st
WHERE ra.prefix = 8
AND ra.fiscal_yr = 11
AND ss.raid = ra.id
AND st.ssid = ss.id
INTO result
FROM dual;BTW, a good practice would be to use bind variables for the query. DBMS_XMLGEN can handle them nicely :
CREATE OR REPLACE FUNCTION get_xml
RETURN CLOB
IS
qryctx   DBMS_XMLGEN.ctxHandle;
v_out    CLOB;
qrystr   VARCHAR2(4000) :=
'SELECT ra.prefix ||''-''|| ra.suffix ||''-''|| ra.fiscal_yr as accession,
        ss.date_in,
        st.test
FROM rcv.recv_accessions ra,
      ser.sero_samples ss,
      ser.sero_tests st
WHERE ra.prefix = :b_prefix
AND ra.fiscal_yr = :b_fiscal_yr
AND ss.raid = ra.id
AND st.ssid = ss.id';
BEGIN
qryctx := DBMS_XMLGEN.newContext(qrystr);
DBMS_XMLGEN.setBindValue(qryctx, 'b_prefix', '8');
DBMS_XMLGEN.setBindValue(qryctx, 'b_fiscal_yr', '11');
-- to generate empty elements if necessary :
DBMS_XMLGEN.setNullHandling(qryctx, DBMS_XMLGEN.EMPTY_TAG);
v_out := DBMS_XMLGEN.getXML(qryctx);
DBMS_XMLGEN.closeContext(qryctx);
RETURN v_out;
END;

DUAL Table problem

As a quick way to grant privileges to almost all the objects in my schema to a role, i created a procedure (Courtesy of user CD from Oracle Forums). But when i executed the below mentioned procedure i got the error :
ORA-01720: grant option does not exist for 'SYS.DUAL'
To avoid granting privileges to sys.dual, I tried adding AND OBJECT_NAME < > 'SYS.DUAL' and AND OBJECT_NAME < > 'DUAL' to the query. But that this didn't help.
But when i query SELECT * FROM DUAL; i can see that DUAL table exists in my schema.
Any thoughts?
Here is what i did
CREATE ROLE newrole;
DECLARE
v_sql VARCHAR2(4000);
BEGIN
FOR obj IN (SELECT object_name
, object_type
, DECODE (OBJECT_TYPE,
'PROCEDURE','EXECUTE',
'FUNCTION' ,'EXECUTE',
'PACKAGE' ,'EXECUTE',
'SYNONYM' ,'SELECT' ,
'SEQUENCE' ,'SELECT' ,
'MATERIALIZED VIEW','SELECT',
'SELECT, INSERT, UPDATE, DELETE') rights
FROM user_objects where object_type IN
('FUNCTION','PROCEDURE','PACKAGE','SYNONYM','SEQUENCE','MATERIALIZED VIEW','TABLE','VIEW'))
LOOP
v_sql := 'GRANT ' || obj.rights || ' ON ' || obj.object_name || ' TO NEWROLE';
dbms_output.put_line(v_sql);
EXECUTE IMMEDIATE v_sql;
END LOOP;
END;
/

One of your views must reference DUAL, perhaps indirectly.
If this comes up again you can create an exception to catch the error inside the loop for the current item and continue. Not pretty, but it should work something like (untested)
for record in cursor loop
    --block to catch exception
    declare
       my_error exception;
      --substitute proper error number for -000001 below
      pragma exception_init(-000001,my_error)
    begin
    exception
      when my_error then
        null;
    end;
    --continue processing with next loop item
end loop;

Silly question on dual table

Hello gurus
This dual table is a dummy table with varchar2(1)....my question is how it can select many psedocolumns from dual doesn't it exceed the allowed space of varchar2(1)
Edited by: 964145 on Oct 9, 2012 5:35 PM

>
it cannot be a real table
>
Not sure why you say that.
The DDL for it is in the dcore.bsq file (11.2) in the rdbms/admin folder
create table dual /* pl/sql's standard pckg requires dual. */
(dummy varchar2(1)) /* note, the optimizer knows sys.dual is single row */
storage (initial 1)
insert into dual values ('X')
/See the SQL Language doc
http://docs.oracle.com/cd/B28359_01/server.111/b28286/queries009.htm#SQLRF20036
>
Selecting from the DUAL Table
DUAL is a table automatically created by Oracle Database along with the data dictionary. DUAL is in the schema of the user SYS but is accessible by the name DUAL to all users. It has one column, DUMMY, defined to be VARCHAR2(1), and contains one row with a value X. Selecting from the DUAL table is useful for computing a constant expression with the SELECT statement. Because DUAL has only one row, the constant is returned only once. Alternatively, you can select a constant, pseudocolumn, or expression from any table, but the value will be returned as many times as there are rows in the table. Refer to "About SQL Functions" for many examples of selecting a constant value from DUAL.
>
And the Database Concepts doc
http://docs.oracle.com/cd/B28359_01/server.111/b28318/datadict.htm
>
The DUAL Table
The table named DUAL is a small table in the data dictionary that Oracle Database and user-written programs can reference to guarantee a known result. This table has one column called DUMMY and one row containing the value X.
>
And those pseudo-columns you ask about
>
select sysdate,UID,rowid from dual;
>
You can query those from any table but as the doc quote above says you will get as many values as there are rows in the table.

Using sql query as a table name

hello,
I have a table(say table1) which is storing the names of some other tables. I want to access the name of a table from table1 using sql query and then use the result of this query as the table name to access the data from
retrieved table name. How can I do this ?
ex:
select * from (select tablename from table1 where tableid='1');
I want to do something likw this. How can I do this?

I want to access the name of a table from table1 using sql query and then use the result of this query as the table name to access the data from retrieved table name. How can I do this ?e.g. like this:
SQL> with table1 as (
select 'emp' tablename from dual
select extractvalue(x.column_value, 'ROW/ENAME') ename
from table1, xmltable('ROWSET/ROW' passing dbms_xmlgen.getxmltype('select * from ' || tablename)) x
ENAME
SMITH
ALLEN
WARD
JONES
MARTIN
BLAKE
CLARK
SCOTT
KING
TURNER
ADAMS
JAMES
FORD
MILLER
14 rows selected.

Avoid Hard Parsing for executing dynamic SQL using DUAL table Oracle

I want to know if dynamic sql statements involving DUAL table can be modified to remove HARD PARSING.
We have several SQL statements are stored in configuration table, here is sample example
-- query 1 before replacing index values as stored in config table ---
select count(*) from dual where 'REPLACE_VALUE_OF_INDEX_3' IN ('K')
AND (('REPLACE_VALUE_OF_INDEX_13' IN ('1053','1095','1199') ) OR ('REPLACE_VALUE_OF_INDEX_13' IN ('1200') ))
AND 'REPLACE_VALUE_OF_INDEX_2' IN ('6')
AND 'REPLACE_VALUE_OF_INDEX_15' IN ('870001305')
-- query 1 after replacing index values--
select count(*) from dual where 'REPLACE_VALUE_OF_INDEX_10' IN ('K')
AND (('1030' IN ('1053','1095','1199') ) OR ('1030' IN ('1200') ))
AND '2' IN ('6')
AND 'X' IN ('870001305')
-- query 2 before replacing index values as stored in config table --
select count(*) from dual where 'REPLACE_VALUE_OF_INDEX_5' IN ('361A','362A')
AND 'REPLACE_VALUE_OF_INDEX_22' BETWEEN '200707' AND '200806'
-- query 2 after replacing index values--
select count(*) from dual where '3MAA' IN ('361A','362A') AND '201304' BETWEEN '200707' AND '200806'

If I got it right you have some (maybe lots of) conditions stored in a table (be patient - it's my interpretation)
create table eb_conditions as
select 1 rid,q'{:5 IN ('361A','362A') AND :3 BETWEEN '200707' AND '200806'}' cndtn from dual union all
select 2,q'{:2 IN ('361A','362A') AND :3 BETWEEN '200707' AND '200806'}' from dual union all
select 3,q'{:1 IN ('K') AND ((:2 IN ('1053','1095','1199') ) OR (:4 IN ('1200') )) AND :3 IN ('6') AND :5 IN ('870001305')}' from dual
RID
CNDTN
1
:5 IN ('361A','362A') AND :3 BETWEEN '200707' AND '200806'
2
:2 IN ('361A','362A') AND :3 BETWEEN '200707' AND '200806'
3
:1 IN ('K') AND ((:2 IN ('1053','1095','1199') ) OR (:4 IN ('1200') )) AND :3 IN ('6') AND :5 IN ('870001305')
and you have to check the conditions using values stored in an array
I used a table instead: the vl at rid = 1 representing the value of bind variable :1 in eb_conditions table and so on ...
create table eb_array as
select 1 rid,'K' vl from dual union all
select 2,'1199' from dual union all
select 3,'200803' from dual union all
select 4,'1000' from dual union all
select 5,'870001305' from dual
RID
VL
1
K
2
1199
3
200803
4
1000
5
870001305
You want to check the conditions using select count(*) from dual where <condition with binds substituted fron the array>
Judging from the title Hard Parsing represents the major problem and you cannot avoid it since every condition to be verified is different from every other condition.
I think your best bet is not to evaluate conditions row by row - context shift cannot be avoided and there might be more than one for each iteration.
So try to do it in a single step:
declare
w_cndtn varchar2(4000);
w_clob clob;
w_cursor sys_refcursor;
one number;
two number;
begin
dbms_lob.createtemporary(w_clob,false);
for rw in (select rid,
                    max(cndtn) cndtn,
                    listagg(val,',') within group (order by rn)||',' usng
               from (select c.rid,c.cndtn,c.rn,c.bind,
                            replace(rtrim(c.bind),':'||to_char(v.rid),''''||v.vl||'''') val
                       from (select rid,
                                    cndtn,
                                    regexp_substr(cndtn,':\d+ ',1,level) bind,
                                    level rn
                               from eb_conditions
                             connect by level <= regexp_count(cndtn,':')
                                    and prior rid = rid
                                    and prior sys_guid() is not null
                            ) c,
                            eb_array v
                      where instr(c.bind,':'||v.rid||' ') > 0
              group by rid
loop
    w_cndtn := rw.cndtn;
    while instr(w_cndtn,':') > 0
    loop
      w_cndtn := replace(w_cndtn,trim(regexp_substr(w_cndtn,':\d+ ',1,1)),substr(rw.usng,1,instr(rw.usng,',') - 1));
      rw.usng := substr(rw.usng,instr(rw.usng,',') + 1);
    end loop;
    w_cndtn := 'select '||to_char(rw.rid)||' cndtn_id,count(*) from dual where '||w_cndtn||' union all ';
    w_clob := w_clob ||' '||w_cndtn;
end loop;
w_clob := substr(w_clob,1,instr(w_clob,'union all',-1,1) - 1);
open w_cursor for w_clob;
loop
    fetch w_cursor into one,two;
    exit when w_cursor%notfound;
    dbms_output.put_line(to_char(one)||':'||to_char(two));
end loop;
dbms_lob.freetemporary(w_clob);
end;
1:0
2:0
3:0
Statement processed.
Regards
Etbin

How to use dual table in ODI in source side for nested queries?

Hi,
Any idea how to use dual table in source for more than once. I want to build a ODI interface for the following source query
SELECT ACTV_TYP.ACTV_TYP_SRC_CD, ACTV_TYP.ACTV_TYP, PORT_ACTV_TYP.PORT_ACTV_TYP_SRC_CD, PORT_ACTV_TYP.PORT_ACTV_TYP, SFT_DLT_STS.SFT_DLT_STS_SRC_CD, SFT_DLT_STS.SFT_DLT_STS
FROM
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FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BRKR_PORTS'
AND COLUMN_NAME = 'WORK_PORT_TYPE') PORT_ACTV_TYP,
(SELECT LOW_VALUE SFT_DLT_STS_SRC_CD, MEANING SFT_DLT_STS
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BANKS'
AND COLUMN_NAME = 'REC_STATUS') SFT_DLT_STS,
(SELECT 1 ACTV_TYP_SRC_CD, '?????' ACTV_TYP FROM DUAL
UNION ALL
SELECT 2 ACTV_TYP_SRC_CD, '???????' ACTV_TYP FROM DUAL) ACTV_TYP
Regards

If the below query is equivalent , it seems you don't need dual table at all , just default the values in the interface.
You are using dual tables to populate values ACTV_TYP.ACTV_TYP_SRC_CD, ACTV_TYP.ACTV_TYP values. Look at your query in the following manner :
SELECT '1', '?????', PORT_ACTV_TYP.PORT_ACTV_TYP_SRC_CD, PORT_ACTV_TYP.PORT_ACTV_TYP, SFT_DLT_STS.SFT_DLT_STS_SRC_CD, SFT_DLT_STS.SFT_DLT_STS
FROM
SELECT LOW_VALUE PORT_ACTV_TYP_SRC_CD, MEANING PORT_ACTV_TYP
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BRKR_PORTS'
AND COLUMN_NAME = 'WORK_PORT_TYPE') PORT_ACTV_TYP,
(SELECT LOW_VALUE SFT_DLT_STS_SRC_CD, MEANING SFT_DLT_STS
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BANKS'
AND COLUMN_NAME = 'REC_STATUS') SFT_DLT_STS
UNION
SELECT 2 , '??????', PORT_ACTV_TYP.PORT_ACTV_TYP_SRC_CD, PORT_ACTV_TYP.PORT_ACTV_TYP, SFT_DLT_STS.SFT_DLT_STS_SRC_CD, SFT_DLT_STS.SFT_DLT_STS
FROM
SELECT LOW_VALUE PORT_ACTV_TYP_SRC_CD, MEANING PORT_ACTV_TYP
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BRKR_PORTS'
AND COLUMN_NAME = 'WORK_PORT_TYPE') PORT_ACTV_TYP,
(SELECT LOW_VALUE SFT_DLT_STS_SRC_CD, MEANING SFT_DLT_STS
FROM CUSTOMS.DOMAIN_ALLOW_COLUMNS_VALUES
WHERE TABLE_NAME = 'BANKS'
AND COLUMN_NAME = 'REC_STATUS') SFT_DLT_STS
Now you can use dataset to make UNION.

Run a query on linked tables to create a new datasource

Using Crystal XI
I have a report that draws from two data sources. They can't be joined at the server side, but they are linked in Crystal Database Expert.
I can't figure out if Crystal gives me a way to write an SQL Query to run an aggregate function referencing both tables. The results of this query would be the datasource for a graph in the report. I'm wondering if Crystal gives me a way, maybe through subreports, to write the query I need.
More concretely:
And I want to include in my datasource alarmId, Hour and the Maximum amount of calls received in any one hour for any one station (this maximum is to provide scale for a graph)
In one table nameed AlarmStartTimes I have data like
Alarms
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Alarm1       8       Joe
Alarm23 10      Mark
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Joe         Station1
Mark         Station2
Linda          Station1
So if I could just join my talbes at the server side I'd use a query like:
select *, max(select count(AlarmID) from Alarms, EELocation from Alarms Join EELocationo on Alarms.Recipient=EELocation.Recipient group by Hour, Location) AS from Alarms
Anyway, that's probably got a syntax error or 4 in it, but you get the idea.
I can't group on the database side. Since Crystal is able to link the two tables and successfully group them out by Location, it seems like there should be some way for me to run a query against the tables reflecting that existing link, but I can't see how to do it.
The reason I can't link on database side is that the data is in two databases, and it's not known what the location of the databases is at report-writing time. The location of the databases gets set via the Crystal API when the report is launched from an application.

Since you have 2 datasource in the report you are limited on what you can use in crystal, such as crystal will not allow you to use sql expressions.

How to get save result from EXECUTE from a dynamic SQL query in another table?

Hi everyone,
I have this query:
declare @query varchar(max) = ''
declare @par varchar(10)
SELECT @par = col1 FROM Set
declare @region varchar(50)
SELECT @region = Region FROM Customer
declare @key int
SELECT @key = CustomerKey FROM Customer
SET @query = 'SELECT CustomerKey FROM Customer where ' + @par + ' = '+ @key+ ' '
EXECUTE (@query)
With this query I want get col1 from SET and compare it to the column Region from Customer. I would like to get the matching CustomerKey for it.
After execution it says commands are executed successfully. But I want to save the result from @query in another table. I looked it up and most people say to use sp_executesql. I tried a few constructions as sampled and I would always get this error:
Msg 214, Level 16, State 2, Procedure sp_executesql, Line 12
Procedure expects parameter '@statement' of type 'ntext/nchar/nvarchar'.
So the output should be a list of CustomerKeys in another table.
How can I save the results from EXECUTE into a variable? Then I assume I can INSERT INTO - SELECT in another table.
Thanks

CREATE TABLE Customer
(CustomerKey INT , Name NVARCHAR(100));
GO
INSERT dbo.Customer
VALUES ( 1, N'Sam' )
GO
DECLARE @query nvarchar(max) = ''
declare @par varchar(10) = 'Name',
@key varchar(10) = 'Sam'
CREATE TABLE #temp ( CustomerKey INT );
SET @query =
insert #temp
SELECT CustomerKey
FROM Customer
where ' + @par + ' = '''+ @key+ ''' '
PRINT @query
EXEC sp_executesql @query
SELECT *
FROM #temp
DROP TABLE #temp;
DROP TABLE dbo.Customer
Cheers,
Saeid Hasani
Database Consultant
Please feel free to contact me at [email protected] as well as on Twitter and Facebook.
[My Writings on TechNet Wiki] [T-SQL Blog] [Curah!]
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Tune query on dual table.

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