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SQL ERROR!

>>> Database: xxxxx_ (localhost)

>>>>>> ALTER TABLE xxx_posts ADD COLUMN post_id bigint(20) NOT NULL auto_increment;

>>>>>> Incorrect table definition; there can be only one auto column and it must be defined as a key

SQL ERROR!

>>> Database: xxxxx_ (localhost)

>>>>>> ALTER TABLE xxx_posts ADD PRIMARY KEY (post_id);

>>>>>> Key column post_id doesn't exist in table

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