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.
Update columns with not NULL

Update columns with not NULL

2004-04-07       - By Dusan Kolesar

 Back
Reply:     1     2     3  

Hello,

Is it posible to make :
update tab1 (col1, col2) values (:myvar1, :myvar2) where id=1;
But I want to update only columns where myvarX is not NULL,
when the value is NULL I want to let previous value of column.
I know when I divide my query :
if (myvar1 <> NULL) then
  update tab1 (col1) values (:myvar1) where id=1;
if (myvar2 <> NULL) then
  update tab1 (col2) values (:myvar2) where id=1;
it will work, but when I have some UPDATE trigger defined for the table,
this trigger will fire for every update and I prefer when it fires only
once.

Thank you, for your suggestions.

Best regards, Dusan

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