SQL 错误 [156] [S0001]：关键字“union”附近的语法不正确答案

【问题标题】：SQL Error [156] [S0001]: Incorrect syntax near the keyword 'union'SQL 错误 [156] [S0001]：关键字“union”附近的语法不正确
【发布时间】：2021-04-26 00:30:25
【问题描述】：

WITH a AS
(
    SELECT 
        ii.RPTCategory AS Cat,
        YEAR(ii.CreateDate) AS CatYear, MONTH(ii.CreateDate) AS CatMonth,
        COUNT(*) AS CatNo
    FROM 
        InsInvoice ii 
    WHERE
        ii.RPTCategory IN ('12')
    GROUP BY
        ii.RPTCategory, YEAR(ii.CreateDate), MONTH(ii.CreateDate)
),
b AS
(
    SELECT 
        ii.Category AS Cat,
        YEAR(ii.CreateDate) AS CatYear, MONTH(ii.CreateDate) AS CatMonth,
        COUNT(*) AS CatNo
    FROM 
        InsInvoice ii 
    WHERE
        ii.Category IN ('41')
    GROUP BY
        ii.Category, YEAR(ii.CreateDate), MONTH(ii.CreateDate)
)
SELECT *
FROM 
    (a UNION b)

我得到了错误

关键字 union 附近的语法不正确

我完成的所有搜索，用户在他们的子选择语句中使用order by 时遇到错误，但我没有这样做。我尝试将其拆分为子选择语句而不是使用 with 子句，但我得到了同样的错误。

【问题讨论】：

标签： sql union

【解决方案1】：

union 的正确用法是：

select a.*
from a
union
select b.*
from b;

【讨论】：

那行得通。我会在允许的情况下尽快接受。感谢您清理我的原始编辑！