當前位置:首頁 » 編程語言 » sql語句中去掉重復所有元組
擴展閱讀
webinf下怎麼引入js 2023-08-31 21:54:13
堡壘機怎麼打開web 2023-08-31 21:54:11

sql語句中去掉重復所有元組

發布時間: 2022-09-21 11:51:25

『壹』 如何在sql中將重復的所有欄位刪除

用SQL語句,刪除掉重復項只保留一條

在幾千條記錄里,存在著些相同的記錄,如何能用SQL語句,刪除掉重復的呢
1、查找表中多餘的重復記錄,重復記錄是根據單個欄位(peopleId)來判斷
select * from people
where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)

2、刪除表中多餘的重復記錄,重復記錄是根據單個欄位(peopleId)來判斷,只留有rowid最小的記錄
delete from people
where peopleName in (select peopleName from people group by peopleName having count(peopleName) > 1)
and peopleId not in (select min(peopleId) from people group by peopleName having count(peopleName)>1)

3、查找表中多餘的重復記錄(多個欄位)
select * from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)

4、刪除表中多餘的重復記錄(多個欄位),只留有rowid最小的記錄
delete from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)

5、查找表中多餘的重復記錄(多個欄位),不包含rowid最小的記錄
select * from vitae a
where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
6.消除一個欄位的左邊的第一位:
update tableName set [Title]=Right([Title],(len([Title])-1)) where Title like '村%'
7.消除一個欄位的右邊的第一位:
update tableName set [Title]=left([Title],(len([Title])-1)) where Title like '%村'
8.假刪除表中多餘的重復記錄(多個欄位),不包含rowid最小的記錄
update vitae set ispass=-1
where peopleId in (select peopleId from vitae group by peopleId

『貳』 在sql語言中去掉重復值的命令是

distinct。
SQLserver中很明顯的去重復的語句是distinct。selectdistinct是去除重復的記錄行,count(distinctColumn),消除重復值。還有一些不明顯的具有去重功能的詞,例如union,會去除重復的記錄行或值。

『叄』 SQL語句查詢 如何刪除重復多餘的數據

這個是SQL中distinct的典型用法:
1)從字面意思就可以了解到:
distinct
[dis'tiŋkt]
adj.
明顯的;獨特的;清楚的;有區別的
2)在SQL中用distinct來消除重復出現的
欄位
值。
使得每個欄位值只出現一次。
具體用法如下:
select
distinct
欄位名
from
表;
distinct
欄位名
意思就是只顯示一次該欄位名
一般情況下和order
by
結合使用,這樣可以提高效率。
所以這個問題的答案是:select
distinct
1,2,3,4
from
表;
1,2,3,4分別代表第一,二,三,四列的欄位名,我猜測可能第一列就是每個人的ID,
這樣你把重復的ID過濾留下一個,估計就是你想要的結果了。
希望我的回答能讓您滿意。

『肆』 如何在Sql中將重復的所有欄位刪除

用SQL語句,刪除掉重復項只保留一條
在幾千條記錄里,存在著些相同的記錄,如何能用SQL語句,刪除掉重復的呢
1、查找表中多餘的重復記錄,重復記錄是根據單個欄位(peopleId)來判斷
select
*
from
people
where
peopleId
in
(select
peopleId
from
people
group
by
peopleId
having
count(peopleId)
>
1)
2、刪除表中多餘的重復記錄,重復記錄是根據單個欄位(peopleId)來判斷,只留有rowid最小的記錄
delete
from
people
where
peopleName
in
(select
peopleName
from
people
group
by
peopleName
having
count(peopleName)
>
1)
and
peopleId
not
in
(select
min(peopleId)
from
people
group
by
peopleName
having
count(peopleName)>1)
3、查找表中多餘的重復記錄(多個欄位)
select
*
from
vitae
a
where
(a.peopleId,a.seq)
in
(select
peopleId,seq
from
vitae
group
by
peopleId,seq
having
count(*)
>
1)
4、刪除表中多餘的重復記錄(多個欄位),只留有rowid最小的記錄
delete
from
vitae
a
where
(a.peopleId,a.seq)
in
(select
peopleId,seq
from
vitae
group
by
peopleId,seq
having
count(*)
>
1)
and
rowid
not
in
(select
min(rowid)
from
vitae
group
by
peopleId,seq
having
count(*)>1)
5、查找表中多餘的重復記錄(多個欄位),不包含rowid最小的記錄
select
*
from
vitae
a
where
(a.peopleId,a.seq)
in
(select
peopleId,seq
from
vitae
group
by
peopleId,seq
having
count(*)
>
1)
and
rowid
not
in
(select
min(rowid)
from
vitae
group
by
peopleId,seq
having
count(*)>1)
6.消除一個欄位的左邊的第一位:
update
tableName
set
[Title]=Right([Title],(len([Title])-1))
where
Title
like
'村%'
7.消除一個欄位的右邊的第一位:
update
tableName
set
[Title]=left([Title],(len([Title])-1))
where
Title
like
'%村'
8.假刪除表中多餘的重復記錄(多個欄位),不包含rowid最小的記錄
update
vitae
set
ispass=-1
where
peopleId
in
(select
peopleId
from
vitae
group
by
peopleId

『伍』 SQL去掉重復的元組

SELECT NAME,IP,MIN(TIME) FROM TABLE
GROUP BY NAME,IP

『陸』 SQL語句查詢 如何刪除重復多餘的數據

這個是SQL中distinct的典型用法:
1)從字面意思就可以了解到:
distinct [dis'tiŋkt] adj. 明顯的;獨特的;清楚的;有區別的
2)在SQL中用distinct來消除重復出現的欄位值。
使得每個欄位值只出現一次。

具體用法如下:
select distinct 欄位名 from 表;
distinct 欄位名 意思就是只顯示一次該欄位名
一般情況下和order by 結合使用,這樣可以提高效率。

所以這個問題的答案是:select distinct 1,2,3,4 from 表;
1,2,3,4分別代表第一,二,三,四列的欄位名,我猜測可能第一列就是每個人的ID,
這樣你把重復的ID過濾留下一個,估計就是你想要的結果了。
希望我的回答能讓您滿意。

『柒』 sql查詢去掉重復記錄

1、打開要去掉重復數據的資料庫,這里新建一張含有重復數據的user表做示例,如下圖所示:

『捌』 SQL中怎麼樣取消一個集合中存在的重復元祖

SELECT 表1.*
FROM 表1 INNER JOIN
(SELECT UserName, JXS FROM 表1 GROUP BY UserName, JXS HAVING COUNT(*)>1) B ON 表1.UserName = B.UserName AND 表1.JXS = B.JXS

『玖』 SQL語句消除表中重復元組

用distinct 例select distinct 列1 from 表