㈠ sql 查詢語句 資料庫 過濾重復記錄
使用分析函數抄row_number(大部分襲資料庫的新頒布都支持),對數據按你需要的重復欄位進行編號,然後只取編號值為1的記錄。
類似於:
select d.*
from (
-- 按mobile, area, address, post_code對記錄進行分組排序,並且按accept_name升序排
select row_number() over (group by mobile, area, address, post_code order by accept_name) as row_idx, s.*
from dt_orders s
) d
where d.row_idx = 1
㈡ sql語句查詢過濾重復數據
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
復制代碼代碼如下:
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
復制代碼代碼如下:
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)
㈢ sql查詢去掉重復記錄
1、打抄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:
㈣ 用SQL語句怎麼過濾重復數據
有一半是添加表的,因為我沒有你的結果集,所以拼了個表變數做為結果集
,重點在後半部分,處理邏輯是按你的想寫的,前提是如果我沒有理解錯的話
這個方法的結果集返回的是每一年的數據,年數遞增的,行數以有多少個城市為准,不過我感覺你要這樣的結果集沒有什麼意義
declare @tab table(name nvarchar(20), both int)
declare @tabtmp table(name nvarchar(20), both int)
declare @tabname table(name nvarchar(20))
declare @name nvarchar(20)
declare @both int
insert into @tab
select N'上海',1996
union
select N'上海',1997
union
select N'北京',1996
union
select N'北京', 1997
insert into @tabname
select distinct name from @tab
select top 1 @name=name from @tab order by name asc
select @both=MIN(both) from @tab
while(@name is not null)
begin
insert into @tabtmp
select @name,@both
update @tab set name='' where name=@name
set @name=null
select top 1 @name =name from @tab where name<>'' order by name asc
select top 1 @both=both from @tab where both>@both order by both asc
end
select * from @tabtmp
㈤ SQL如何過濾特定欄位重復
你是要每個單位一條記錄嗎?
select 單位=a.dw,MAX(單位屬性=c.dwsx),MAX(商品編碼=a.bh),MAX(品規=a.pm),MAX(分類=b.lm1,MAX(電話=c.dh)
FROM gjht A
LEFT JOIN SPML B ON A.BH=B.BH
LEFT JOIN KHML C ON A.DW=C.DW where b.lm1 like '食品%'
GROUP BY 單位=a.dw
㈥ sql 查詢去除重復行
order by (select 1)與order by 1一樣按第一列排序,按照查詢的結果集第一列排序
㈦ sql 如何過濾重復記錄
SQL過濾重復記錄有兩種辦法:
通過SQL結構化查詢語言來實現,在Select後面加上關鍵字DISTINCT,意思就是查詢行無重復,注意DISTINCT關鍵字是針對行,不是某一列,如果想得到某一列不重復記錄,那就SELECT DISTINCT後面只放一個欄位。
通過存儲過程,過濾重復記錄,存儲過程逐條查詢,比對之前的記錄,如果有重復就跳到下一條,如果不重復游標繼續。
㈧ sql查詢語句過濾重復數據。
SELECT Id,SiteId,InsertTime,IP,Referrer,Url
FROM
(
SELECT ROW_NUMBER()OVER(PARTITION BY IP ORDER BY Id DESC) number,
Id,SiteId,InsertTime,IP,Referrer,Url
From YourTable
)T
where number = 1
拿走不謝
㈨ sql 如何過濾重復記錄
問題背景
在一個多表查詢的sql中正常情況下產生的數據都是唯一的,但因為資料庫中存在錯誤(某張表中存在相同的外鍵ID)導致我這邊查詢出來的數據就會有重復的問題
下面結果集中UserID:15834存在多個
參考:
MSDN: OVER 子句 (Transact-SQL)
stackoverflow sql query distinct with Row_Number
SQL Trick: row_number() is to SELECT what dense_rank() is to SELECT DISTINCT
㈩ SQL查詢中如何剔除重復
1,存在兩條完全相同的紀錄
這是最簡單的一種情況,用關鍵字distinct就可以去掉
example: select distinct * from table(表名) where (條件)
2,存在部分欄位相同的紀錄(有主鍵id即唯一鍵)
如果是這種情況的話用distinct是過濾不了的,這就要用到主鍵id的唯一性特點及group by分組
example:
select * from table where id in (select max(id) from table group by [去除重復的欄位名列表,....])
3,沒有唯一鍵ID
example:
select identity(int1,1) as id,* into newtable(臨時表) from table
select * from newtable where id in (select max(id) from newtable group by [去除重復的欄位名列表,....])
drop table newtable
(10)sql查找過濾重復代碼擴展閱讀
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 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)