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-- add temporary column
ALTER TABLE guild ADD COLUMN created_temp bigint(20) default '0';
-- update temporary columns data
UPDATE guild SET created_temp = UNIX_TIMESTAMP(createdate);
-- drop current column
ALTER TABLE guild DROP COLUMN createdate;
-- create new column with correct type
ALTER TABLE guild ADD COLUMN createdate bigint(20) NOT NULL default '0' AFTER motd;
-- copy data to new column
UPDATE guild set createdate = created_temp;
-- remove old column
ALTER TABLE guild DROP COLUMN created_temp;
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