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文件名称：逻辑操作符-SQL语言基础
文件大小：5.26MB
文件格式：PPT
更新时间：2021-04-25 19:38:11
SQL 基础
逻辑操作符
*
操作符
AND
OR
NOT
含义
两个条件都为TRUE ，则返回TRUE
两个条件中任何一个为TRUE，则返回TRUE
如果条件为FALSE，返回TRUE
*
Logical Operators
A logical operator combines the result of two component conditions to produce a single result based on them or to invert the result of a single condition. Three logical operators are available in SQL:
AND
OR
NOT
All the examples so far have specified only one condition in the WHERE clause. You can use several conditions in one WHERE clause using the AND and OR operators.