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SQL AND & OR 运算符
AND&OR运算符用于根据一个以上的条件过滤记录,即用于组合多个条件以缩小SQL语句中的数据。
WHERE子句可以与AND,OR和NOT运算符结合使用。
AND和OR运算符用于根据多个条件筛选记录:
* 如果由AND分隔的所有条件为TRUE,则AND运算符显示记录。
* 如果使用AND运算符组合N个条件。对于SQL语句执行的操作(无论是事务还是查询),所有由AND分隔的条件都必须为TRUE。
* 如果由OR分隔的任何条件为真,则OR运算符显示记录。
* 如果使用OR运算符组合N个条件。对于SQL语句执行的操作(无论是事务还是查询),OR分隔的任何一个条件都必须为TRUE。
如果条件不为TRUE,则NOT运算符显示记录。
AND语法
OR语法
NOT语法
演示数据库
在本教程中,我们将使用本人的一个数据库:BMS_MVC。
以下是"S_User"表中的数据
AND 运算符实例
以下SQL语句从 "S_User" 表中选择其userId为 "1" 、其roleId为"1" 的人:
实例
结果
OR 运算符实例
以下SQL语句选择userId为1或2的BMS_MVC的所有字段:
实例
结果
NOT运算符实例
以下SQL语句选择roleId不是 3的BMS_MVC的所有字段:
结果
以上就是我所学的SQL AND,OR and NOT(与,或,不是运算符)的方法,如有错误的地方请在评论区为我指出,我会尽量修改的