Question

表1

Color, Total
------------
Red,5
Blue,3
Pink,1

表2

Color, Total
------------
Red,3
Blue,2
Pink,1

期望的结果是：

Results
Color, Total
------------
Red,2
Blue,1
Pink,0

如何从table1中的总列中减去table2中的总列数？

http://sqlfiddle.com/#!3/9eecb7db59d16c80417c72d1/2498

Answer 1

您需要连接表格并减去值：

SELECT t1.color, t1.total - t2.total as Total
FROM @Table1 t1 INNER JOIN @Table2 t2 
    ON t1.color = t2.color

此处已更新SQL Fiddle

Answer 2

使用JOIN

DECLARE @Table1 Table (color nvarchar(4), total int)
INSERT INTO @Table1  Values ('Red', 5)
INSERT INTO @Table1  Values ('Blue', 2)
INSERT INTO @Table1  Values ('Pink', 1)

DECLARE @Table2 Table (color nvarchar(4), total int)
INSERT INTO @Table2  Values ('Red', 3)
INSERT INTO @Table2  Values ('Blue', 1)
INSERT INTO @Table2  Values ('Pink', 1)

SELECT t1.color,t1.total - t2.total as total
from @Table1 t1
join @Table2 t2
on t1.color = t2.color;

SQL Fiddle

Answer 3

JOIN是不错的选择，但我们认为不同：

<强> SqlFiddle

SELECT t.color, SUM(t.total) as total
FROM (
  select color, total  from @Table1
  UNION ALL
  select color, -total  from @Table2) AS t
GROUP BY t.color
ORDER BY total DESC

从table1中的总列中减去table2中的总列数

3 个答案: