sql查询用逗号分隔的字符串参数，在逗号分隔的字段中查询

string str="fuhui,zhaoying";

select * from S_space where CHARINDEX(','+LTRIM(userid)+',',','+'@str'+',')>0;

逗号分隔的字符串中查询 

string str="fuhui,zhaoying";

select * from  S_space_Activity where patindex('%,str,%',','+Fans+',')>0

Fans 字段的值是已逗号分隔的 fuhui,zhaoying