oracle with as 用法

select  * from _tempTable

例子：

with _tempStudent as(

select * from t_student t where class = '初二3班'

)

select sex,count(1) nums from _tempStudent where sex = '男' and height > '170'

union all

select sex,count(1) nums from _tempStudent where sex = '女' and height > '160'

多个with as 用法 每个临时存量直接用 "," 隔开

with t1 as (

     select * from student where name in('张三','李四')

),t2 as (

     select * from student where name in('王五')

)

select * from t1

union 

select * from t2

如果with as 有嵌套的情况， 多个with as，后面的as内部可以直接调用先声明的临时对象

with t1 as (

     select * from student where name in('张三','李四')

),t2 as (

     select * from t1 where name in('王五')

)

select * from t2

oracle with as 用法

标签：oracle   with as   查询结果重复使用