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PHP/Mysql: Drop Column

Posted on 2007-11-30
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Last Modified: 2013-12-12
I am doing this:

mysql_query("ALTER TABLE model DROP COLUMN Column1");

but it says:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'column='Column1'' at line 1

But if i check the table, the column does get removed though...

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Question by:jtcy
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nplib earned 250 total points
ID: 20383001
You've got an error in another sql statement, probably one that runs after that column gets removed and tries to reference the removed column.
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by:Steve Bink
Steve Bink earned 250 total points
ID: 20385671
I'm with nplib.  You'll have to narrow down when the error is coming back, and which query is causing it.  The manual has this to say about altering tables:

>>> In most cases, ALTER TABLE works by making a temporary copy of the original
>>> table. The alteration is performed on the copy, and then the original table is
>>> deleted and the new one is renamed. While ALTER TABLE  is executing, the
>>> original table is readable by other clients. Updates and writes to the table are
>>> stalled until the new table is ready, and then are automatically redirected to
>>> the new table without any failed updates.

If you have other updates or writes going on in the background (for example, on another httpd thread using the same database), those queries will be delayed until the ALTER TABLE is finished.  When they do run, they will on the new version of the table.
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