Vadim,
Monday, April 29, 2002, 7:10:27 PM, you wrote:
V> My company migrated to MySQL a few months ago from Sybase Adaptive
V> Server Anywhere. Where I'm very impressed with the performance and the
V> simplicity of management I find its very difficult, however, to run
V> regular updates or deletes because joins are not supported on delete and
V> update. I can live without stored procedures, triggers and views
V> (although, they are very useful simply can not function as a DBA /SQL
V> developer without being able to perform simple delete on a table set
V> based on the result of a join.
V> Can someone, please, show me an example on how can I delete/update table
V> based on the records in another tables. This is query that works on ASA:
V> delete from t1
V> from t1, t2
V> where t1.col1 = t2.col1
V> and t2.col2 is NULL ;
V> update t1, t2
V> set t1.col=''
V> where t1.col1 = t2.col1
V> and t2.col2 is NULL
Create script with SQL statement:
SELECT CONCAT('UPDATE t1 SET t1.col=\'\' WHERE t1.col1 = ', t1.col1, ';')
FROM t1, t2
WHERE t1.col1= t2.col1
AND t2.col2 IS NULL;
and then run the script as described in the manual:
http://www.mysql.com/doc/A/N/ANSI_diff_Sub-selects.html
V> This syntax does not work in MySQL.
V> Thank you very much for you time.
V> Vadim Kulikov
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