Question

我有一个简单的表格如下

CREATE TABLE [accounting].[ExtractControl](
    [SourceSchema] [varchar](50) NOT NULL,
    [SourceTable] [varchar](150) NOT NULL,
    [SourceDatabase] [varchar](50) NOT NULL)

我想使用 SourceSchema 和 SourceTable 值选择 SourceDatabase

目前我正在进行多项查询，如下所示

Select @s1 = SourceDatabase from accounting.ExtractControl where SourceSchema = 'xxx' and SourceTable = 'xxx'
Select @s2 = SourceDatabase from accounting.ExtractControl where SourceSchema = 'yyy' and SourceTable = 'yyy'
Select @s3 = SourceDatabase from accounting.ExtractControl where SourceSchema = 'xxx' and SourceTable = 'yyy'

我相信这可以用更优雅的方式完成！谢谢你的帮助！

Answer 1

你在问这样的事吗？

select SourceDatabase from accounting.ExtractControl
where SourceSchema in ('xxx', 'yyy') and SourceTable in ('xxx', 'yyy');

这将返回SourceDatabase，其中SourceSchema为'xxx'或'yyy'，SourceTable为'xxx'或'yyy'。

Answer 2

带有一个查询的

选项

SELECT @s1 = MAX(CASE WHEN SourceSchema = 'xxx' and SourceTable = 'xxx' THEN SourceDatabase END),
       @s2 = MAX(CASE WHEN SourceSchema = 'yyy' and SourceTable = 'yyy' THEN SourceDatabase END),
       @s3 = MAX(CASE WHEN SourceSchema = 'xxx' and SourceTable = 'yyy' THEN SourceDatabase END)
FROM accounting.ExtractControl

SQL Fiddle上的演示

Answer 3

select * from accounting.ExtractControl
where SourceSchema = 'xxx' or SourceSchema = 'yyy'

Answer 4

这个查询怎么样......

select SourceDatabase
from accounting.ExtractControl
where SourceSchema in ('xxx', 'yyy')
      and SourceTable in ('xxx', 'yyy')
      and SourceTable = SourceSchema

我没试过，但我认为这就是你所需要的

SQL使用where选择多个列到多个变量

4 个答案: