使用子查询选择创建新表答案

【问题标题】：create new table with subquery select使用子查询选择创建新表
【发布时间】：2012-08-09 11:39:58
【问题描述】：

我正在尝试从子查询选择创建一个新表，但出现以下错误：
')' 附近的语法不正确。

SELECT * INTO foo 
FROM 
(
  SELECT DATEPART(MONTH,a.InvoiceDate) as CalMonth
        ,DATEPART(YEAR,a.InvoiceDate) as CalYear
        ,a.InvoiceDate
        ,a.StockCode
        ,a.QtyInvoiced
        ,a.Volume
  FROM sales a
  UNION ALL
  SELECT ds.CalMonth as CalMonth
        ,ds.CalYear as CalYear
        ,ds.InvoiceDate
        ,ds.StockCode
        ,ds.Cases as QtyInvoiced
        ,ds.Vol as Volume
  FROM sales1 ds
)

【问题讨论】：

您正在使用哪个 RDBMS。究竟是什么错误？
在大多数 DBMS 中，使用 CREATE TABLE foo AS select ... 创建一个新表可能需要使用该语法。

标签： sql subquery

【解决方案1】：

您忘记在查询末尾添加alias。

您可以通过两种方法做到这一点：

1.如果您已经创建了一个表，那么您可以使用Insert Into 执行此操作，如下所示：

INSERT into foo (CalMonth,CalYear,InvoiceDate,StockCode,QtyInvoiced,Volume)
SELECT * FROM
(
SELECT 
    DATEPART(MONTH,a.InvoiceDate) as CalMonth
    ,DATEPART(YEAR,a.InvoiceDate) as CalYear
    ,a.InvoiceDate
    ,a.StockCode
    ,a.QtyInvoiced
    ,a.Volume
FROM sales a
UNION ALL
SELECT 
    ds.CalMonth as CalMonth
    ,ds.CalYear as CalYear
    ,ds.InvoiceDate
    ,ds.StockCode
    ,ds.Cases as QtyInvoiced
    ,ds.Vol as Volume
FROM sales1 ds
) AS table1

例如see this fiddle

2.如果您尚未创建表，则可以使用SELECT * INTO 执行此操作，如下所示：

SELECT * INTO foo from 
(
SELECT 
    DATEPART(MONTH,a.InvoiceDate) as CalMonth,
    DATEPART(YEAR,a.InvoiceDate) as CalYear,
    a.InvoiceDate,
    a.StockCode,
    a.QtyInvoiced,
    a.Volume
FROM sales a
UNION ALL
SELECT 
    ds.CalMonth as CalMonth,
    ds.CalYear as CalYear,
    ds.InvoiceDate,
    ds.StockCode,
    ds.Cases as QtyInvoiced,
    ds.Vol as Volume
FROM sales1 ds
) AS table1

例如see this fiddle

【讨论】：

【解决方案2】：

试试这个

select * into foo from 
(
select 
    DATEPART(MONTH,a.InvoiceDate) as CalMonth,
    DATEPART(YEAR,a.InvoiceDate) as CalYear,
    a.InvoiceDate,
    a.StockCode,
    a.QtyInvoiced,
    a.Volume
from sales a
Union All
select 
    ds.CalMonth as CalMonth,
    ds.CalYear as CalYear,
    ds.InvoiceDate,
    ds.StockCode,
    ds.Cases as QtyInvoiced,
    ds.Vol as Volume
from sales1 ds
) as TAB

只需向您的子查询表提供alias

【讨论】：

【解决方案3】：

试试这个：

    INSERT into foo (CalMonth,CalYear, InvoiceDate,  StockCode, QtyInvoiced, Volume)
Select * From
    (select 
    DATEPART(MONTH,a.InvoiceDate) as CalMonth
    ,DATEPART(YEAR,a.InvoiceDate) as CalYear
    ,a.InvoiceDate
    ,a.StockCode
    ,a.QtyInvoiced
    ,a.Volume
    from sales a
    Union All
    select 
    ds.CalMonth as CalMonth
    ,ds.CalYear as CalYear
    ,ds.InvoiceDate
    ,ds.StockCode
    ,ds.Cases as QtyInvoiced
    ,ds.Vol as Volume
    from sales1 ds
    ) as t

【讨论】：

【解决方案4】：

我认为您要么需要添加已建议的别名，要么（更复杂）删除括号，*、FROM、第二个SELECT 并移动INTO foo：

SELECT  
                                                      --- removed: FROM 
                                                      --- removed: (
                                                      --- removed: SELECT 
         DATEPART(MONTH,a.InvoiceDate) as CalMonth
        ,DATEPART(YEAR,a.InvoiceDate) as CalYear
        ,...
    INTO foo                                          --- moved

  FROM sales a
  UNION ALL
  SELECT ds.CalMonth as CalMonth
        ,...
  FROM sales1 ds ;
                                                      --- removed: )

【讨论】：