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1、求和 2、数字统计 3、求平均值 4、最大最小值 5、分组:group by 单个属性分组: 多个属性分组:一个部门的工作相同的员工的平均工资 6、过滤分组:having having的功能和where类似,都是选择符合条件的分组;但是...
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1、应用场景 当要显示的数据在一个页面显示不完的时候需要进行分页,可以与前端结合进行每一页的切换,或者不想查看全部的信息。 2、分页查询 (1)查询全部学生的信息: SELECT* FROM s_student (2)分页查询: SELEC...