Question

有没有办法合并两个表，但是保持第一个表中的行首先出现在结果集中？

例如：

表1

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

表2

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

我希望结果集为：

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

不幸的是，工会以某种方式重新排序表。有办法解决这个问题吗？

Answer 1

试试这个： -

Select * 
from
( 
Select name,surname, 1 as filter
from  Table1
Union all
Select name,surname , 2 as filter
from Table2
)
order by filter

Answer 2

保证输出顺序的唯一方法是使用ORDER BY：

SELECT name,surname,1 as rs
FROM table1
UNION ALL
SELECT name,surname,2
FROM table2
ORDER BY rs

如果您不希望rs出现在最终结果集中，请将UNION作为子查询执行：

SELECT name,surname
FROM (
  SELECT name,surname,1 as rs
  FROM table1
  UNION ALL
  SELECT name,surname,2
  FROM table2
) t
ORDER BY rs

Answer 3

;WITH cte as (
    SELECT name, surname, 1 as n FROM table1
    UNION ALL
    SELECT name, surname, 2 as n FROM table2
    UNION ALL
    SELECT name, surname, 3 as n FROM table3
)
SELECT name, surname
FROM cte
ORDER BY n;

Answer 4

。喜欢这个？

CREATE TABLE #Table1 (Names VARCHAR(50))
CREATE TABLE #Table2 (Names VARCHAR(50))

INSERT INTO #Table1
(
    Names
)
VALUES
    ('John Doe'), ('Bob Marley'), ('Ras Tafari') 

INSERT INTO #Table2
(
    Names
)
VALUES
    ('Lucky Dube'), ('Abby Arnold') 


SELECT ArbSeq   = 1, *
FROM #Table1
UNION ALL
SELECT ArbSeq   = 2, *
FROM #Table2
ORDER BY ArbSeq

应该注意，未明确定义时不保证排序。如果表具有聚簇索引，则通常会按索引的顺序返回行 - 但这不能保证。

Sql server联合但保持顺序

4 个答案: