dynamic query in sql server

UNION All SELECTN'Zhang San'N'English', -GOSELECT * from [Testrows2columns](Figure 2: Sample Data)(b) First, a static way to achieve row to column, the effect of 3 is shown:--1: Static splicing row to columnSELECT [UserName],SUM( Case [Subject] when 'Mathematics' Then [Source] ELSE 0 END) as '[Mathematics]',SUM( Case [Subject] when 'English' Then [Source] ELSE 0 END) as '[English]',SUM( Case [Subject] when 'language' Then [Source] ELSE 0 END) as '[Language]' from [Testrows2colu

UNION All SELECTN'Zhang San'N'English', -GOSELECT * from [Testrows2columns](Figure 2: Sample Data)(b) First, a static way to achieve row to column, the effect of 3 is shown:--1: Static splicing row to columnSELECT [UserName],SUM( Case [Subject] when 'Mathematics' Then [Source] ELSE 0 END) as '[Mathematics]',SUM( Case [Subject] when 'English' Then [Source] ELSE 0 END) as '[English]',SUM( Case [Subject] when 'language' Then [Source] ELSE 0 END) as '[Language]' from [Testrows2colu

I. Dynamic execution of SQLPREPARE from ' Delete from Test ' ; EXECUTE S1;Second, using cursorsDECLARE CURSOR for SELECT from FJDC. V_i_dg_dm_zy_wl_zbhz_attr T; OPEN V_cursor; FETCH into V_deletesql,v_insertsql; CLOSE V_cursor;Third, while loop while true -do expression ENDwhile;Iv. DB2 query table data, generate dynamic

Today, when writing a program, you need to generate an SQL statement from the start ID to the end ID. It turns out that you don't need this feature now. How do you query SQL Server for data SQL statements that are queried between the first few to several in the database?For

Read Catalogue Begin How SQL Server looks for records SQL Server Join method More specific execution procedures Index statistics: The choice of the query plan is based on Optimizing View Queries Recommended Reading-MSDN Articles For

Read SQL Server query planRead Catalogue Begin How SQL Server looks for records SQL Server Join method More specific execution procedures Index statistics: The

This article describes in detail how to optimize SQL Server database queries. There are many reasons for slow query speed in SQL Server databases. The following are common causes: 1. No index or no index is used (this is the most common problem of slow

Server machine, SQL may run concurrently with other programs, such as IIS, and the administrator may try to set up SQL Server to run a fixed amount of memory, in order to control that it does not occupy the memory used for sharing. But this is not necessarily the wish. On the one hand, setting the maximum amount of me

Label:--Paging data----row_number () is called window-opening function, can be paged operation Select Row_number () over (order by ID) as Num,*from gb_data----adds a sequential num value to each column to facilitate the use of the first few data. Select row_number () over (order by ID) as num,* from Gb_data where Num>5and num 10--This line of code is wrong, because the system does not recognize how much num is, why? -Because of the order of execution, the

' English ', 100 GO SELECT * FROM [Testrows2columns] (Figure 2: Sample Data) (b) First, a static way to achieve row to column, the effect of 3 is shown: --1: Static splicing row to column SELECT [UserName], SUM (case [Subject] when ' math ' then [Source] ELSE 0 END) as ' [Math] ', SUM (case [Subject] when ' English ' then [Source] ELSE 0 END) as ' [English] ', SUM (case [Subject] when ' language ' then [Source] ELSE 0 END) as

', n ' language ', UNION all SELECT N ' Zhang San ', N ' English ', 100 GO SELECT * FROM [Testrows2columns] (Figure 2: Sample Data) (b) First, a static way to achieve row to column, the effect of 3 is shown: --1: Static splicing row to column SELECT [UserName], SUM (case [Subject] when ' math ' then [Source] ELSE 0 END) as ' [Math] ', SUM (case [Subject] when ' English ' then [Source] ELSE 0 END) as ' [English