sql auto update dupdated at

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1ALTER TABLE t1
2ADD COLUMN created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
3ADD COLUMN updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;
4

1CREATE TABLE t1 (
2  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ,
3  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
4);
5

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