sql如何获取一个字段中后3位的最大值? 用SUBSTR字符函数=-=SELECT gg,SUBSTR(gg,2),SUBSTR(gg,2,5)FROM nammm;gg SUBSTR(gg,2)substr(gg,2,5)kk1 k1 k1kkggg2 kggg2 kggg2kkkkllss3 kkkllss3 kkkllkkjfkfdfggh6 kjfkfdfggh6 kjfkf查出的结果分别是显示nammm表里gg列:所有字符,从第2个显示到最后,从第2显示到第5个。你要查询出最大的那个序列号可以这样写=SELECT MAX(SUBSTR(gg,9))FROM nammm;
c#怎么获取SQL某个字段的值 我只给你手写大概的,sqlconnection conn=new.连接字符串做参数sqlcommand cmd=new(sql,conn);string name=cmd.executescalar().tostring()
SQL 查询一个表中 两个字段数量都大于2条记录的数据 SELECT*FROM A表 WWHERE EXISTS(SELECT s_id,s_name FROM A表 WHERE sid=W.sid and s_name=W.s_name group by s_id,s_name having count(*)>;=2)
获取字段中多个值的sql语句 DECLARE@TempTable table(UserID int,UserName nvarchar(50));insert into@TempTable(UserID,UserName)values(1,'张三')insert into@TempTable(UserID,UserName)values(2,'李四')insert into@TempTable(UserID,UserName)values(3,'王五')insert into@TempTable(UserID,UserName)values(4,'*')declare@id varchar(1000)declare@name varchar(1000)select@id=isnull(@id,'')+cast(UserID as varchar(10))+',',name=isnull(@name,'')+cast(UserName as varchar(10))+','from@TempTable where UserID in(1,2,3)select@id,@name
SQL 查询一个字段所有的之出现次数大于2的条数 with tmp(Name)asselect '张三2113' union allselect '张三' union allselect '李四' union allselect '王五52614102' union allselect '王五' union allselect '王五' union allselect '赵六' union allselect '赵六')select count(*)fromselect Name from tmp group by Name having count(*)>;1t结果为:1653