Question

根据Redshift WITH Clause documentation，您可以使用带有INSERT INTO...SELECT语句的WITH子句。但是在测试时，我收到以下错误。这是不可能的，还是我的语法错了？

CREATE TABLE TestCTEInsert (SomeTimestamp TIMESTAMP);
WITH CTE AS
(SELECT GETDATE() as SomeTimestamp)
INSERT INTO TestCTEInsert
    (SomeTimestamp) SELECT SomeTimestamp from CTE;

错误：42601：语法错误在或附近＆＃34;插入＆＃34;

有趣的是，它确实支持插入新表格，即

WITH CTE AS
(SELECT GETDATE() as SomeTimestamp)
INSERT SomeTimestamp INTO NewTable 
SELECT SomeTimestamp from CTE;

命令成功完成（受影响的一行）

编辑：要确认，使用INTEGER列而不是TIMESTAMP时会出现同样的错误：

CREATE TABLE TestCTE (SomeInt INTEGER);
WITH CTE AS
(SELECT 1 as SomeInt)
INSERT INTO TestCTEInsert 
SELECT SomeInt from CTE;

错误：42601：语法错误在或附近＆＃34;插入＆＃34;

Answer 1

尝试将CTE放入插入物中（不确定是否胜过该点）

INSERT INTO TestCTEInsert
WITH CTE AS
(SELECT CURRENT_TIMESTAMP as SomeTimestamp)
SELECT SomeTimestamp from CTE;

Answer 2

; 终止一个语句，所以它需要在语句的末尾，而不是在中间的某个地方：

您可以通过两种方式执行此操作，使用create table as select

create table TestCTEInsert 
as
WITH CTE AS
(  
   SELECT current_timestamp as SomeTimestamp
)
SELECT SomeTimestamp 
from CTE; -- ; only at the end

或分两步：

CREATE TABLE TestCTEInsert (SomeTimestamp TIMESTAMP); -- end this with a ;

insert into TestCTEInsert
WITH CTE AS
(  
   SELECT current_timestamp as SomeTimestamp
)
SELECT SomeTimestamp 
from CTE; -- ; only at the end

以上是在一个vanilla Postgres安装上运行的，我无法访问RDS

Answer 3

将脚本更改为此

  CREATE TABLE TestCTE (SomeInt INTEGER)
  WITH CTE AS (SELECT 1 as SomeInt) 
  INSERT INTO TestCTE  SELECT SomeInt from CTE;

Answer 4

试试这个

 CREATE TABLE TestCTE (SomeInt INTEGER)
;WITH CTE AS
(SELECT 1 as SomeInt)
INSERT (SomeInt) INTO TestCTE
SELECT SomeInt FROM CTE;

Redshift从CTE INSERT INTO TABLE

4 个答案: