select in在mssql和mysql下的差别：
mssql:
select * from upfiles where id in( SELECT picture FROM msg where id=77 );
SELECT picture FROM msg where id=77 结果为：'12,11,10,4'
select * from upfiles where id in( SELECT picture FROM msg where id=77 )结果为：12,11,10,4
mysql:
select * from upfiles where id in( SELECT picture FROM msg where id=77 );
SELECT picture FROM msg where id=77 结果为：'12,11,10,4'
select * from upfiles where id in( SELECT picture FROM msg where id=77 )结果为：12
mssql修正写法：
select * from upfiles where instr(( SELECT picture FROM msg where id=77 ),id)>0;
结果为：12,11,10,4
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