sql字段为逗号分开的字符串值的关联查询

1.TREE表:

[strID] [int] IDENTITY(1,1) NOT NULL,
[strName] [nvarchar](50) NOT NULL,

2.SubInfo

CREATE TABLE [dbo].[SubInfo](
 [SuBID] [int] NOT NULL,
 [SubTreeID] [nvarchar](max) NULL,

SQL语句为:

select a.strID,a.strName from Tree as a where exists(select * from SubInfo where charindex(cast(a.strID as varchar(max))+',',SubTreeID)>0)

这里红色加的分号必须要加上，不然的花,如果是215,连21也会区配.

查询后结果为:

如果SubTreeID:1,2,3,215则select a.strID,a.strName from Tree as a where exists(select * from SubInfo where charindex(cast(a.strID as varchar(max)),SubTreeID)>0)

查询结果为

本来21为思茅的是不应该查询出来的,所以要叫逗号来处理

4.select a.strID,a.strName,b.* from Tree as a join SubInfo as b on charindex(cast(a.strID as varchar(max))+',',SubTreeID)>0
这个是把SubInfo 表的数据也显示出来

结果为: