mysql change all values in a column

Question

I want to change all values in the tablecolumn "Quellendatum".

When the row-value is 2005-06-20 then it should be replaced with 2012-06-20. When the row-value is NULL or empty, then it should be untouched.

Currently i modify this manually by selecting the row:

UPDATE  `outgoing2`.`tbl_hochschule`  SET  `Quellendatum` =  '2012-06-20'  WHERE  `tbl_hochschule`.`id` =1; 

Is there a way to automate this task?

Answer 1

How about:

UPDATE outgoing2.tbl_hochschule  SET Quellendatum = '2012-06-20'  WHERE Quellendatum = '2005-06-20'  AND !isnull( Quellendatum ); 

Answer 2

In MySql you can do:

UPDATE TABLENAME     SET IDCOLUMN=VALUE     WHERE IDCOLUMN=VALUE     AND !isnull (IDCOLUMN)