Question

有没有办法将两个表联合起来，但是保持第一个表中的行首先出现在结果集中？但是，orderby列不在选择查询

中

例如：

表1

name        surname
-------------------
John         Doe
Bob          Marley
Ras          Tafari

表2

name       surname
------------------
Lucky      Dube
Abby       Arnold
Result

预期结果：

name        surname
-------------------
John         Doe
Bob          Marley 
Ras          Tafari
Lucky      Dube
Abby       Arnold

我通过以下查询

来提供数据

SELECT name,surname FROM TABLE 1 ORDER BY ID  
UNION  
SELECT name,surname FROM TABLE 2

上述查询未在联合后跟踪订单 P.S - 我不想在我的选择查询中显示ID 我通过连接表获得ORDER BY Column。以下是我的真实查询

  SELECT tbl_Event_Type_Sort_Orders.Appraisal_Event_Type_ID AS Appraisal_Event_Type_ID , ISNULL(tbl_Appraisal_Event_Types.Appraisal_Event_Type_Display_Name, 'UnCategorized') AS  Appraisal_Event_Type_Display_Name 
INTO #temptbl
FROM tbl_Event_Type_Sort_Orders 
INNER JOIN tbl_Appraisal_Event_Types
ON tbl_Event_Type_Sort_Orders.Appraisal_Event_Type_ID = tbl_Appraisal_Event_Types.Appraisal_Event_Type_ID
WHERE 1=1
AND User_Name='abc' 
ORDER BY tbl_Event_Type_Sort_Orders.Sort_Order

SELECT * FROM #temptbl 
UNION 
SELECT DISTINCT (tbl_Appraisal_Event_Types.Appraisal_Event_Type_ID) AS Appraisal_Event_Type_ID , ISNULL(tbl_Appraisal_Event_Types.Appraisal_Event_Type_Display_Name, 'UnCategorized') AS  Appraisal_Event_Type_Display_Name 
FROM tbl_Appraisal_Event_Types
INNER JOIN tbl_Appraisal_Events
ON tbl_Appraisal_Event_Types.Appraisal_Event_Type_ID = tbl_Appraisal_Events.Event_Type_ID
INNER JOIN tbl_Appraisals 
ON tbl_Appraisal_Events.Appraisal_ID = tbl_Appraisal_Events.Appraisal_ID
WHERE 1=1
AND ((tbl_Appraisals.Assigned_To_Staff_User) = 'abc'  OR (tbl_Appraisals.Assigned_To_Staff_User2) = 'abc' OR (tbl_Appraisals.Assigned_To_Staff_User3) = 'abc')

Answer 1

将UNION ALL放在派生表中。要保持重复消除，请执行select distinct并在第二个选择中添加NOT EXISTS，以避免在两个表中找到同一个人两次：

select name, surname
from
(
    select distinct name, surname, 1 as tno
    from table1
    union all
    select distinct name, surname, 2 as tno
    from table2 t2
    where not exists (select * from table1 t1
                      where t2.name = t1.name
                        and t2.surname = t1.surname)
) dt
order by tno, surname, name

Answer 2

您可以写如下，如果您对重复数据没问题，那么请使用UNION ALL它会更快：

SELECT NAME, surname FROM (
SELECT ID,name,surname FROM TABLE 1 
UNION
SELECT ID,name,surname FROM TABLE 2 ) t ORDER BY ID

Answer 3

只需使用UNION条款而不使用order by。

   SELECT name,surname FROM TABLE 1 
   UNION
   SELECT name,surname FROM TABLE 2

如果您想订购第一张表，请使用以下查询。

;WITH cte_1
AS
 (SELECT name,surname,ROW_NUMBER()OVER(ORDER BY  Id)b FROM TABLE 1 )
SELECT name,surname
FROM cte_1
UNION 
SELECT name,surname 
FROM TABLE 2

Answer 4

您可以使用表格的列和要按以下顺序排列的ID：

SELECT x.name, x.surname FROM (
    SELECT ID, TableID = 1, name, surname
    FROM table1

    UNION  ALL

    SELECT ID = -1, TableID = 2, name, surname
    FROM table2
) x
ORDER BY x.TableID, x.ID

Answer 5

这将首先按照您需要的任何顺序排列第一行集（尚未测试代码）

;with cte_1
as 
 (SELECT ID,name,surname,1 as table_id FROM TABLE 1 
  UNION
  SELECT ID,name,surname,2 as table_id FROM TABLE 2 ) 
SELECT name, surname 
FROM cte_1
ORDER BY table_id,ID

SQL - 如何在UNION查询中排序

5 个答案: