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mysql(Group By 分组查询)

卿卿如梦 2022-11-04 阅读 79


1.GROUP_CONCAT()

SELECT   t.gradeName ,GROUP_CONCAT(t.stuName)FROM t_student    t    GROUP BY  t.gradename

mysql(Group By 分组查询)_系统

2.COUNT()

SELECT   t.gradeName ,COUNT(t.stuName) FROM t_student t  GROUP BYt.gradename

mysql(Group By 分组查询)_系统_02

3.HAVING COUNT(t.stuName)>3

SELECT   t.gradeName ,COUNT(t.stuName) FROM t_student t  GROUP BY t.gradenameHAVING COUNT(t.stuName)>3

mysql(Group By 分组查询)_系统_03

4.LIMIT  

SELECT * FROM t_student LIMIT  0,5 



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