A. sql语句 去除重复
select userid,min(username) username,groupid
from table_name
where userid=1
group by userid,groupid
order by 1,3
B. 用SQL语句查询信息,怎么去掉相同的
你这种方法只能用于删除查询结果中的重复信息。(根据姓名进行筛选),结果自然只有不重复的姓名,使用子查询便可解决了
select id,姓名 from table where 姓名 in(
select distinct 姓名 from table where (条件))
C. 【sql去除重复数据】
select
DISTINCT finger,width,height,size,type
form image
order by finger,width,height,size,type
D. SQL查询去除重复记录
select distinct(*)
from 表名
where 职业="无业"
上边distinct 就是去除重复的关键字
E. SQL查询 如何去掉相同的列
太简单了. delete from table where id in (select id from tablename group by sno... having count(*)>1)
F. SQL查询,如何去除重复的记录
首先,先说明一个问题。这样的结果出现,说明系统设计是有问题的。
其次
删除重复数据,你要提供你是什么数据库。
不同数据库会有不同的解决方案。
关键字Distinct 去除重复,如下列SQL,去除Test相同的记录;
1. select distinct Test from Table
2. 如果是要删除表中存在的重复记录,那就逻辑处理,如下:
3. select Test from Table group by Test having count(test)>1
4. 先查询存在重复的数据,后面根据条件删除
还有一个更简单的方法可以尝试一下:
select aid, count(distinct uid) from 表名 group by aid
这是sqlserver 的写法。
如图一在数据表中有两个膀胱冲洗重复的记录。
G. 求SQL消除重复数据语句
select * from #t1
union
select * from #t2
这条语句一起执行是把两个表中唯一的查询出来,如果用union all会把两个表中的结果并集起来
H. SQL查询中如何剔除重复
1,存在两条完全相同的纪录
这是最简单的一种情况,用关键字distinct就可以去掉
example: select distinct * from table(表名) where (条件)
2,存在部分字段相同的纪录(有主键id即唯一键)
如果是这种情况的话用distinct是过滤不了的,这就要用到主键id的唯一性特点及group by分组
example:
select * from table where id in (select max(id) from table group by [去除重复的字段名列表,....])
3,没有唯一键ID
example:
select identity(int1,1) as id,* into newtable(临时表) from table
select * from newtable where id in (select max(id) from newtable group by [去除重复的字段名列表,....])
drop table newtable
(8)sql去除相同扩展阅读
1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断
select * from people
where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
2、删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录
delete from people
where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1)
3、查找表中多余的重复记录(多个字段)
select * from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
I. sql去除重复的项
假设存在一个主键ID,Name为重复列,下面这句可以查出所有的没有重复的数据:
select * from 表 as a where ID=(select min(ID) from 表 where Name=a.Name) 。
根据上面这句就可以删除所有重复项的数据:
delete from 表 where ID not in(select ID from 表 as a where ID=(select min(ID) from 表 where Name=a.Name))。
J. sql去掉重复值
用一个distinct
可以去重:
SELECT
distinct
t5.FBillNo
AS
'订单编号',CONVERT(varchar(10)
,
t5.FDate,120)
AS
'日期'
,
t4.FName
AS
'客户名称',t6.fallamount
AS
'订单金额'
,
t1.fallamount
AS
'开票金额',
t2.FDate
AS
'发票'
,
t3.FPreAmountFor
AS
'预收款'
,
t3.FAmountFor
AS
'现金',
t8.FName
AS
'制单人'
,
t6.FAmount-t3.FPreAmountFor-t3.FPreAmountFor
as
'余额'
,
t6.FInterID
,
t4.FItemID
FROM
ICSaleEntry
t1
,
ICSale
t2
,
t_RP_NewReceiveBill
t3,t_Organization
t4,SEOrder
t5,SEOrderEntry
t6,
--dbo.t_rp_Exchange
t7,dbo.t_User
t8,dbo.t_Department
t9,dbo.t_Currency
t10
where
t1.FOrderInterID=t5.FInterID
AND
t2.FInterID=t1.FInterID
AND
t5.FInterID=t6.FInterID
AND
t5.FCustID=t4.FItemID
AND
t3.fexplanation=t2.fnote
--AND
t3.FBillID=t7.FBillID
AND
t3.FPreparer=t8.FUserID
and
t9.fitemId=t5.FDeptID
and
t10.FCurrencyID=t5.FCurrencyID
AND
t5.FInterID=t6.FInterID
AND
t5.FCustID=t4.FItemID