"Go" [SQL Server] group take maximum minimum value common SQL

Transferred from: http://blog.csdn.net/xys_777/article/details/5711128

--group to take the largest and smallest common SQL
--Test environment
If object_id (' TB ') is not null drop table TB;
Go
CREATE TABLE TB (
col1 int,
col2 int,
Fcount int)
INSERT INTO TB
Select 11,20,1 UNION ALL
Select 11,22,1 UNION ALL
Select 11,23,2 UNION ALL
Select 11,24,5 UNION ALL
Select 12,39,1 UNION ALL
Select 12,40,3 UNION ALL
Select 12,38,4
Go
--Query
--1
SELECT * from TB t where fcount= (select Max (fcount) from TB where col1=t.col1)
--2
SELECT * from TB T where NOT exists (select 1 from TB where col1=t.col1 and Fcount>t.fcount)--much higher efficiency (LUI2015-5-13 notes)
-Results
/*
Col1 col2 Fcount
----------- ----------- -----------
12 38 4
11 24 5

*/

"Go" [SQL Server] group take maximum minimum value common SQL