过滤

阅读(706) 标签: 过滤, where,

语法描述:

SELECT select_list

FROM T

WHERE search_condition

参数说明:

search_condition

T的过滤条件

举例:

SELECT CustID,CustName,Contact,ContactTitle,CityCode

FROM Customer  WHERE  ContactTitle == "Owner"

查询ContactTitleOwner的记录

SELECT CustID,CustName,Contact,ContactTitle,CityCode

FROM Customer  WHERE  ([30101,30201,50101]).contain(CityCode)

查询CityCode30101,30201,50101的员工信息

 

知识点:

1search_condition 中除了常规的大于,小于,等于等单值判断,还可以使用集算器函数,例如上例中使用contain()