子查询分解不能在 PostgreSQL 中工作

Question

我在使用postgresql的时候，遇到一个problem.Here是代码：

    WITH t1 AS (
    SELECT
    TABLE_NAME AS TABELA
FROM
    INFORMATION_SCHEMA.COLUMNS
WHERE 
    COLUMN_NAME LIKE 'nu_cns' )
SELECT 
    TABLE_NAME,
    COLUMN_NAME
FROM 
    INFORMATION_SCHEMA.COLUMNS
WHERE 
    TABLE_NAME IN t1

如果我运行它，我会得到一个错误：

ERROR:  syntax error at or near "t1"
LINE 14:  TABLE_NAME IN t1
                    ^
SQL state: 42601
Character: 211

但奇怪的是，如果我将 t1 替换为整个子查询，它可以运行成功，如下所示：

    WITH t1 AS (
    SELECT
    TABLE_NAME AS TABELA
FROM
    INFORMATION_SCHEMA.COLUMNS
WHERE 
    COLUMN_NAME LIKE 'nu_cns' )
SELECT 
    TABLE_NAME,
    COLUMN_NAME
FROM 
    INFORMATION_SCHEMA.COLUMNS
WHERE 
    TABLE_NAME IN (
    SELECT
    TABLE_NAME AS TABELA
FROM
    INFORMATION_SCHEMA.COLUMNS
WHERE 
    COLUMN_NAME LIKE 'nu_cns' )

你看，其实子查询跟t1.So完全一样，为什么前者不行？谢谢！

Answer 1

尝试以下操作：您需要从子查询中的 t1 select table_name

WITH t1 AS 
( 
  SELECT TABLE_NAME AS TABELA
  FROM INFORMATION_SCHEMA.COLUMNS
  WHERE COLUMN_NAME LIKE 'nu_cns' 
)

SELECT 
    TABLE_NAME,
    COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME IN (select table_name from t1)

子查询分解不能在 PostgreSQL 中工作

subquery factoring cannot work in PostgreSQL

sql

postgresql

common-table-expression