Sql server 在复杂查询中使用带并集和别名的ORDER BY

我想用UNION对以下查询的序号进行排序，但无法完成，尽管谷歌搜索了很多次

IF LEN(@_Order_No)=0
BEGIN 
    SELECT a._PROCESS_INST_NO,c._ISSUE_DATE,c._DELIVERY_DATE, a._Order_No,a._GOODS_CD,a._GOODS_NAME ,
            --a._QTY,
            CAST(a._QTY  as DECIMAL (38,2))  as _QTY,
                b._GOODS_CD as RM_CD,b._GOODS_NAME as RM_NAME,b._UNIT,
            (CASE  
                WHEN  LEFT(a._GOODS_NAME,2)='SS' OR LEFT(a._GOODS_NAME,2)='SN'  THEN
                CAST(a._QTY as DECIMAL (38,2)) * CAST(b._QTY  as DECIMAL (38,2))/ NULLIF(SUM(CAST(a._QTY AS decimal(38,2) )) OVER (PARTITION BY  a._Order_No ,b._GOODS_CD),0) 
            ELSE
                CAST(b._QTY  as DECIMAL (38,2))
            END) as  RM_QTY
        FROM [ENVNDIVDB].[dbo].[TBL_PROC_PM] a
        INNER JOIN [ENVNDIVDB].[dbo].[TBL_PROC_PMS] b
        ON a._PROCESS_INST_NO=b._PROCESS_INST_NO 
        INNER JOIN [ENVNDIVDB].[dbo].[TBL_PROC_PH] c
        ON a._PROCESS_INST_NO=c._PROCESS_INST_NO
        WHERE c._DELIVERY_DATE BETWEEN @startDate AND @endDate

    UNION ALL

    SELECT a._PROCESS_INST_NO,c._ISSUE_DATE,c._DELIVERY_DATE, a._Order_No,a._GOODS_CD,a._GOODS_NAME ,
            --a._QTY,
            CAST(a._QTY  as DECIMAL (38,2))  as _QTY,
            b._GOODS_CD as RM_CD,b._GOODS_NAME as RM_NAME,b._UNIT,
            (CASE  
                WHEN  LEFT(a._GOODS_NAME,2)='SS' OR LEFT(a._GOODS_NAME,2)='SN'  THEN
                CAST(a._QTY as DECIMAL (38,2)) * CAST(b._QTY  as DECIMAL (38,2))/ NULLIF(SUM(CAST(a._QTY AS decimal(38,2) )) OVER (PARTITION BY  a._Order_No ,b._GOODS_CD),0) 
            ELSE CAST(b._QTY  as DECIMAL (38,2))
            END) as  RM_QTY
        FROM [ENVNDIVDB].[dbo].[TBL_PROC_PM] a
        INNER JOIN [ENVNDIVDB].[dbo].[TBL_PROC_PMS] b
        ON a._PROCESS_INST_NO=b._PROCESS_INST_NO 
        INNER JOIN [ENVNDIVDB].[dbo].[TBL_PROC_PH] c
        ON a._PROCESS_INST_NO=c._PROCESS_INST_NO
        WHERE c._DELIVERY_DATE BETWEEN @startDate AND @endDate

    SELECT '' as _PROCESS_INST_NO,'' as _ISSUE_DATE,'' as _DELIVERY_DATE, a.X_PO_NO as _Order_No,a.[X_GOODS_CD] as _GOODS_CD ,a.[X_GOODS_NAME1] as _GOODS_NAME ,
        CAST(X_QTY  as DECIMAL (38,2))  as _QTY,'' as RM_CD,'' as RM_NAME , '' as _UNIT,
            0.0 as RM_QTY
        FROM  [ENVIETNAMPO].[dbo].[_TBL_PO_M] a
END
ELSE
BEGIN 
    SELECT a._PROCESS_INST_NO,c._ISSUE_DATE,c._DELIVERY_DATE, a._Order_No,a._GOODS_CD,a._GOODS_NAME,CAST(a._QTY  as DECIMAL (38,2))  as _QTY,
            b._GOODS_CD as RM_CD,b._GOODS_NAME as RM_NAME,b._UNIT,
            (CASE  
                WHEN  LEFT(a._GOODS_NAME,2)='SS' OR LEFT(a._GOODS_NAME,2)='SN'  THEN
                CAST(a._QTY as DECIMAL (38,2)) * CAST(b._QTY  as DECIMAL (38,2))/ NULLIF(SUM(CAST(a._QTY AS decimal(38,2) )) OVER (PARTITION BY  a._Order_No ,b._GOODS_CD),0) 
            ELSE
                CAST(b._QTY  as DECIMAL (38,2))
            END) as  RM_QTY
        FROM [ENVNDIVDB].[dbo].[TBL_PROC_PM] a
        INNER JOIN [ENVNDIVDB].[dbo].[TBL_PROC_PMS] b
        ON a._PROCESS_INST_NO=b._PROCESS_INST_NO 
        INNER JOIN [ENVNDIVDB].[dbo].[TBL_PROC_PH] c
        ON a._PROCESS_INST_NO=c._PROCESS_INST_NO
        WHERE c._DELIVERY_DATE BETWEEN @startDate AND @endDate AND a._Order_No=@_Order_No

    UNION

    SELECT '' as _PROCESS_INST_NO,'' as _ISSUE_DATE,'' as _DELIVERY_DATE, a.X_PO_NO as _Order_No,a.[X_GOODS_CD] as _GOODS_CD ,a.[X_GOODS_NAME1] as _GOODS_NAME ,
            CAST(X_QTY  as DECIMAL (38,2))  as _QTY,'' as RM_CD,'' as RM_NAME , '' as _UNIT, 0.0 as RM_QTY
        FROM  [ENVIETNAMPO].[dbo].[_TBL_PO_M] a        
        WHERE a.X_PO_NO=@_Order_No
END

就这样做吧：

SELECT _Order_No FROM (values(1), (2), (4), (6)) [first](_Order_No)
UNION 
SELECT _Order_No FROM (values(3), (7), (8), (5)) [second](_Order_No)
ORDER BY _Order_No;

输出：

_Order_No
-----------
1
2
3
4
5
6
7
8

---

这是我的解决方案，它是有效的

if(dbo.fn_LisIsActice()=1)
begin
    select a, b, c from TableA
    union all
    select a, b, c from TableB   

           order by a


end
else
begin
    select a, b, c from TableA order by a
end

---

抱歉，但我仍然无法将此应用于我的查询。你能帮我更多吗。谢谢