*******************************************SQLServer2000重複資料刪除資料(總結)******************************************* 一、具有主鍵的情況 I.具有唯一性的欄位id(為唯一主鍵) delete 使用者表 where id not in ( select max(id) from 使用者表 group by col1,col2,col3... ) grou
如何用一條sql語句刪除表中所相同的記錄?重複資料刪除資料 一、具有主鍵的情況 a.具有唯一性的欄位id(為唯一主鍵) delete table where id not in ( select max(id) from table group by col1,col2,col3... ) group by 子句後跟的欄位就是你用來判斷重複的條件,如只有col1, 那麼只要col1欄位內容相同即表示記錄相同。 b.具有聯合主鍵 假設col1+','+col2+','...col5
-- ======================================================--列出SQL SERVER 所有表,欄位名,主鍵,類型,長度,小數位元等資訊--在查詢分析器裡運行即可,可以產生一個表,匯出到EXCEL中-- ======================================================SELECT (case when a.colorder=1 then d.name else '' end)表名,
How to Debug your Stored Procedure? In many cases, you might want to test your SP on various scenarios and go through each step on how your data gets changed at each step. The below steps should help you to achieve the goal:a) Go to SQL
-- Script to analyze table space usage using the-- output from the sp_spaceused stored procedure-- Works with SQL 7.0, 2000, and 2005set nocount onprint 'Show Size, Space Used, Unused Space, Type, and Name of all database
Delete與Top連用限制刪除行 晚上寫程式,希望使用top關鍵字限制刪除行的範圍,試了幾次總是發現語句不能執行。當時自己的思路是這樣的 delete producttemp where productid in (select top 5* from producttemp)google了一下發現Csdn上面給類似問題的回複與我寫出的sql語句思路差不多,估計大家都沒有實驗過,就憑自己感覺這麼寫了吧。最後還是在MSDN上面得到正解: 可以使用 TOP 子句限制 DELETE
Declare @str varchar(50)set @str=''declare @str2 varchar(50)set @str2=''declare @i intset @i=0while(@i<=1000000000000)begin SELECT top 6 @str=@str+[Number]+',' FROM [Infosys_Connie].[dbo].[DoubleBall] order by newid() print @str SELECT top 1
Unisys的筆試題 似乎每次有人去都是一樣的題目 趁空隙就記了下來 希望對學弟學妹有所協助oo:1.what is virtual method?2.what is Polymorphism?3.difference between overloading and overriding4.difference between abstract class and interface?How to decide to use which one?c++:1.difference between