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Summary of MySQL key challenges (2)

2022-07-02 04:51:00 【Go and be safe~】

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according to dept_no To summarize , Belonging to the same department emp_no Connect by comma , The results show that dept_no And the connected results employees

CREATE TABLE `dept_emp` (
`emp_no` int(11) NOT NULL,
`dept_no` char(4) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`dept_no`));
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