Question

Configuration:
WAMP Server on WinServer 2008 R2, MySQL v5.1.36
I’m running my query directly in the MySQL Terminal.
The table being targeted is an InnoDB table, and the field being set is a lookup field against a string FK.

Challenge:
The query results say that there are a bunch of matches, but that no changes are being made.
What am I missing?

BTW: My experience level with MySQL Terminal is quite limited. In fact, I’m really only using it now because PhpMyAdmin chokes on the query (time exceeded throwing PMA session error).

Code:
The SQL I’m using is extremely basic:

UPDATE `my_table_name` 
SET `vendor_type` = 'master'
WHERE `data_source` = 'Group One'

Here are the results of the query:

Query OK, 0 Rows affected (15.94 sec)
Rows matched: 149947 Changed: 0 Warnings: 0

As you can see, there are almost 150k records that “should” be getting updated, but aren’t.

Answer 1

Perhaps because they all have the value “master” already.