Question

这句话有什么问题？我收到以下错误：

第15行，第1行，第4行关键字“ORDER”附近的语法不正确。

第15行，第15行，第1行，第9行关键字“ORDER”附近的语法不正确。

(SELECT TOP 1 dbo.ZERORATES.Maturity_Date AS Date1, dbo.ZERORATES.Zero_Rate AS Rate1
    FROM dbo.ZERORATES
    WHERE dbo.ZERORATES.Maturity_Date < '2013-05-16'
    ORDER BY dbo.ZERORATES.Maturity_Date DESC)
UNION
(SELECT TOP 1 dbo.ZERORATES.Maturity_Date AS Date2, dbo.ZERORATES.Zero_Rate AS Rate2
    FROM dbo.ZERORATES
    WHERE dbo.ZERORATES.Maturity_Date > '2013-05-16'
    ORDER BY dbo.ZERORATES.Maturity_Date ASC)

Answer 1

尝试将您的查询嵌入选择

select * from
(SELECT TOP 1 dbo.ZERORATES.Maturity_Date AS Date1, dbo.ZERORATES.Zero_Rate AS Rate1
    FROM dbo.ZERORATES
    WHERE dbo.ZERORATES.Maturity_Date < '2013-05-16'
    ORDER BY dbo.ZERORATES.Maturity_Date DESC) as T
UNION
select * from
(SELECT TOP 1 dbo.ZERORATES.Maturity_Date AS Date2, dbo.ZERORATES.Zero_Rate AS Rate2
    FROM dbo.ZERORATES
    WHERE dbo.ZERORATES.Maturity_Date > '2013-05-16'
    ORDER BY dbo.ZERORATES.Maturity_Date ASC) as T

Answer 2

UNION只能有一个订单，只能在最后一个选择中，子查询只能有1列，将其更改为：

SELECT TOP 1 dbo.ZERORATES.Maturity_Date AS Date1, dbo.ZERORATES.Zero_Rate AS Rate1
    INTO #Temp1
FROM dbo.ZERORATES    
WHERE dbo.ZERORATES.Maturity_Date < '2013-05-16'  
ORDER BY dbo.ZERORATES.Maturity_Date DESC
UNION
SELECT TOP 1 dbo.ZERORATES.Maturity_Date AS Date1, dbo.ZERORATES.Zero_Rate AS Rate1
    INTO #Temp2    
FROM dbo.ZERORATES    
WHERE dbo.ZERORATES.Maturity_Date > '2013-05-16'    
ORDER BY dbo.ZERORATES.Maturity_Date ASC

SELECT * FROM #Temp1
UNION 
SELECT * FROM #Temp2

Answer 3

ORDER BY在视图EDIT（仅在SQLServer中）中无效，除非指定了SELECT TOP / EDIT。在加入表格后尝试订购结果集。

Answer 4

UNION只能有一个ORDER，以获得可以使用MIN和MAX的顶部和底部值

SELECT MAX(dbo.ZERORATES.Maturity_Date) AS Date, dbo.ZERORATES.Zero_Rate AS Rate
FROM dbo.ZERORATES
WHERE dbo.ZERORATES.Maturity_Date < '2013-05-16'
GROUP BY dbo.ZERORATES.Zero_Rate

UNION

SELECT MIN(dbo.ZERORATES.Maturity_Date) AS Date, dbo.ZERORATES.Zero_Rate AS Rate
FROM dbo.ZERORATES
WHERE dbo.ZERORATES.Maturity_Date > '2013-05-16'
GROUP BY dbo.ZERORATES.Zero_Rate

Answer 5

如果每个日期的行数不超过1行，则会执行以下操作：

SELECT z.Maturity_Date AS Date
     , z.Zero_Rate AS Rate
FROM
    dbo.ZERORATES z
        JOIN 
        (   SELECT MAX(dbo.ZERORATES.Maturity_Date) AS D
            FROM dbo.ZERORATES
            WHERE dbo.ZERORATES.Maturity_Date < '2013-05-16'
        UNION  
            SELECT MIN(dbo.ZERORATES.Maturity_Date) AS D
            FROM dbo.ZERORATES
            WHERE dbo.ZERORATES.Maturity_Date > '2013-05-16'
        )
    AS maxmin
        ON z.Maturity_Date = maxmin.D

我确信使用OVER()和PARTITION BY有更优雅的解决方案，但我现在不在SQL服务器附近进行检查。

带有ORDER的SQL UNION

5 个答案: