sql - 别名 POSTGRES select 语句

Question

我想在查询中创建新表并在最后使用它们进行最终查询。我不记得语法是什么，也无法在任何地方找到它。 (这里是一个仅供说明的基本示例)。

phones as 
    (
        SELECT phone_number from customers
    )


emails as 
    (
        SELECT emails from customers
    )

// do something with both

Answer 1

您正在寻找 CTE 的

With phones as 
    (
        SELECT phone_number from customers
    )
,emails as 
    (
        SELECT emails from customers
    )
select * from phones--/emails