Mailing List
Home
MySQL General - General MySQL discussion
MaxDB - Everything about MaxDB, formerly known as SAP DB
MySQL on Win32 - Runing MySQL on Windows 9x/Me/NT/2000/XP
MySQL++ - Programming with the C++ API to MySQL
ODBC - ODBC with the MySQL Connector/ODBC driver
Java Help - Mostly related to the MySQL Connector/J driver
Perl - Perl support for MySQL with DBI and DBD::mysql
GUI - MySQL GUI Tools
Announcement
Subjects
• mysql openssl Question
• mysql:it 's a db not a dbms how it 's possible?!
• Does the binary log enabling affect the MySQL performances?
• Strange behavior, Table Level Permission
• FULLTEXT query format question
• Preventing Duplicate Entries
• Comparing and writing out BLOBS
• Executing MySQL Commands From Within C Program
• Can 't access mysql after kernel upgrade
• Mysql 4 0 Oracle Stored Procedure Trigger Conversion
• Downgrade Mysql from 4 to 3 23
• MySQL Cluster Software
• mysql test 4 1 fails with the gis test
• ERROR 2002: Can 't connect to local MySQL server through socket
• Getting Identity after INSERT
• Update one field with more fields from another table
• ERROR 1045: Access denied for user: 'root@localhost ' (Using
password: NO)
• mysql have same function mthod as Oracle decode()
 
Search:  
Power your search with and, or, +, -, or "some phrase" operators.
AW: Exists Query

AW: Exists Query

2004-05-11       - By Anhaus, Thomas

 Back

>How can I implement an IF statement with a Exist predicate
>ej.
>if exists(select 1 from dba.mytable where mycolumnpk=1) then begin
>    insert into z values (1);
>end;

It is not possible to place a sql statement into a IF statement. As a
workaround you could extract the select statement from the IF statement :

VAR cnt integer;
select count(*) into :cnt from dba.mytable where
                              mycolumnpk = 1 and rowno <= 1;
IF cnt > 0
then
  insert into z values(1);

Best Regards,
Thomas

--
MaxDB Discussion Mailing List
For list archives: http://lists.mysql.com/maxdb
To unsubscribe:    http://lists.mysql.com/maxdb?unsub=thomas.anhaus@(protected)

--
MaxDB Discussion Mailing List
For list archives: http://lists.mysql.com/maxdb
To unsubscribe:    http://lists.mysql.com/maxdb?unsub=mysql@(protected)