逻辑运算符

可以合并两个或更多条件。条件必须由 ANDOR 相关联,例如:

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salary = 40000 AND exempt = 1

逻辑 NOT 运算符用于反转含义,例如:

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NOT (salary = 40000 AND exempt = 1)

示例

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SELECT * FROM Sales_Data WHERE Sales_Data.Company_Name
   NOT LIKE '%University' AND Sales_Data.Amount > 3000

SELECT * FROM Sales_Data WHERE (Sales_Data.Company_Name
   LIKE '%University' OR Sales_Data.Amount > 3000)
   AND Sales_Data.Salesperson_ID = 'SP-1'