大家好，小新来为大家解答以上的问题。microsoft sql，关于microsoft sql的介绍很多人还不知道，现在让我们一起来看看吧！
目录1 案发现场2 第一次优化3 第二次优化exists和not exists常用示例说明1.查询a表在b表中存在数据2.查询a表在b表中不存在数据3.查询时间最新记录4.exists替代distinct剔除重复数据总结最近我在公司优化了一些慢查询
While executing join query I am getting duplicate data instead of th开发者_Python百科e \"distinct\" keyword. I dim much more google and gained nothing. The table names are \"Event\" which holds list o
I\'m a newbie, just learni开发者_开发问答ng SQL and have this question: I have two tables with the same columns. Some registers are in the two tables but others only are in one of the tables. To illus
I need to run 3 consecutive queries using the same derived table... I\'m using MS SQL Server 2008 Select a,b,c from categories inner join (select x,y,z from derivedTable where…) …
I am using ASP.NET with C# and I need to make the condition of the query dynamic, Example: Database: NameSex
In most SQL products, I can select from no table or from a dummy table like this: -- Oracle SELECT 1 FROM DUAL
I want the user to upload a profile picture! I want to upload the file (picture), store the string/path and filename in my db and move the file to my images folder! BUT I DON\'T HAVE A CLUE HOW TO DO
I\'m trying to retrieve the closest adjacent rows (above and below) a record in a result set that match a certain condition.
My apologies if this has been asked and wasn\'t able to find this.I\'ve searched for a long time, with no luck.
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