如何判断表某列内容并返回值

如何判断表某列内容并返回值
MSSQL2000

表 TEST,
列
BILLID , ITEMNO,QTY
1 , 1 , 2
1 , 2 , 44
1 , 3 , 55
1 , 4 , 88

如何可以判断到该列QTY全部大于0时返回T,如果有其中一个数小于0则返回F



[解决办法]

SQL code

if exists(select 1 from test twhere not exists(select 1 from test where billid=t.billid and qty<=0))  print 'T'else   print 'F'
[解决办法]
SQL code
--> 测试数据：[TEST]if object_id('[TEST]') is not null drop table [TEST]create table [TEST]([BILLID] int,[ITEMNO] int,[QTY] int)insert [TEST]select 1,1,2 union allselect 1,2,44 union allselect 1,3,55 union allselect 1,4,-3 union allselect 1,5,88select      case         when exists(select 1 from test where [QTY]<0)             then 'F' else 'T' end as [state]/*state------------F*/