Posted By

simondiercks on 03/30/10

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Last Edited at 03/30/10 06:16am

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add auto-imcremented column to existing table without ex- and reimporting

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How to add an auto-incremented column to an existing table without ex- and reimporting.

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alter table t1, change id id int (11) DEFAULT '0' NOT NULL, drop primary key;
ALTER TABLE table ADD id2 INT UNSIGNED NOT NULL AUTO_INCREMENT, ADD PRIMARY KEY (id2);
alter table t1, change id2 id2 int (10)  NULL, drop primary key;
alter table t1, change id id int (11)UNSIGNED  DEFAULT '0' NOT NULL AUTO_INCREMENT, add primary key(id);