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ALTER TABLE REFRESH
ADD COLUMN created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
ADD COLUMN updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
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ALTER TABLE t1
ADD COLUMN created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
ADD COLUMN updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;
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ALTER TABLE t1
ADD COLUMN createdAt TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
ADD COLUMN updatedAt DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;
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CREATE TABLE t1 (
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ,
updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);