ALTER TABLE tag
MODIFY COLUMN gmt_create datetime NULL DEFAULT CURRENT_TIMESTAMP AFTER create_by,
MODIFY COLUMN gmt_modified datetime NULL ON UPDATE CURRENT_TIMESTAMP DEFAULT CURRENT_TIMESTAMP;
ALTER TABLE tag
MODIFY COLUMN gmt_create datetime NULL DEFAULT CURRENT_TIMESTAMP AFTER create_by,
MODIFY COLUMN gmt_modified datetime NULL ON UPDATE CURRENT_TIMESTAMP DEFAULT CURRENT_TIMESTAMP;
本文标题：datetime
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