SQL Server

I am making a report today, but I did not pay attention to it at first glance. I checked it carefully. It turns out that I want to count the sales volume for a certain period of time in a sales detail list in SQL Server and compare it by week, I had

SQL Server 2005 T-SQL: CTE Concept:Common table expression (CTE) is a common table expression. Usage:It is difficult to deal with SQL statements of previous versions, such as paging and recursive queries... Basic usage:   With ()As()Select

Reference Source: http://sqlforums.windowsitpro.com/web/forum/messageview.aspx? Catid = 74 & threadid = 47900 & enterthread = y When using a database, we sometimes need to know the disk space occupied by the database. In the past, the disk space

If the default value of a column is set when a table column is added dynamically, If you use the alter table tablename drop column columnname statement, an error is returned, For example: "Message 5074, level 16, status 1, 1st row object 'df _

How to copy a table using t_ SQL statements I have a database datahr and demo in SQL Server 2000. Their structures are the same. Other tables are named gbitem. now I want to copy all the contents of the Table Name: gbitem of the demo database to

-- Obtain the version number of MS SQL Execute master .. sp_msgetversion -- Obtain the hard disk file information-- Parameter description: directory name, directory depth, and whether to display filesExecute master .. xp_dirtree 'C :'Execute

Declare @ temp table([ID] int identity (1, 1 ),[Name] varchar (10))Declare @ tempid int, @ tempname varchar (10) Insert into @ temp values ('A ')Insert into @ temp values ('B ')Insert into @ temp values ('C ')Insert into @ temp values ('D ')Insert

Baya pavliashvili 07.31.2003 Rating: --- (out of 5) Reseeding identities in SQL Server identity columns are commonly used as primary keys for SQL Server tables. if you're not familiar with identity columns, they are automatically

C # create an SQL Server database After creating a database connection object, we canProgramUse it. First, we dynamically create an SQL Server database in C # in the program. We create the database in the C: \ mysql directory. to practice this

Create Table # T1(Id int identity (1, 1)Not null,BH int)Insert into # T1Select 1, 492417420Select *From # T1Drop table # T1-- Update a piece of data, which actually affects 0 rows-- 4 secondsUpdate test. [sgoa_data]. [DBO]. [NSB]Set flag = 1

Reference: http://www.cnblogs.com/xbf321/archive/2008/11/02/1325067.html Exec('Select * From tablename ') Declare @ Slideavg Real Declare @ Sql1 Nvarchar ( 1000 ) Set @ Sql1 = ' Select@ Slideavg= AVG (VAL) from S ' + @

The databases used by the company's SharePoint system share the same database with other applications. During the planning period, due to lack of experience, only the size of the content stored in SharePoint was taken into account, and the log size

Cursors are evil! In relational databases, we think about queries in a set. The cursor breaks this rule and changes the way we think about it into a row-by-row approach. For C-like developers, this approach is more comfortable. The normal way

For XML Path some people may not know. In fact, it shows the query result set in XML format, with this feature, we can simplify our query statements to implement some work that may previously need to be completed through the function live storage

A recent project is about the synchronization of different databases. Considering the timeliness of dataProgramAdded multipleactiveresultsets to the database link string; Multipleactiveresultsets is used to specify whether the result set of

Select Convert ( Varchar (100 ), Getdate (), 0): 05 16 2006 AM Select Convert ( Varchar (100 ), Getdate (), 1): 05/16/06 Select Convert ( Varchar (100 ), Getdate (), 2): 06.05.16 Select Convert ( Varchar (100 ), Getdate (), 3): 16/05/06

Basic knowledge of SQL server indexing (1) --- basic format of record data [from] http://blog.joycode.com/ghj/archive/2008/01/02/113290.aspx As I needed to train my colleagues on database indexing knowledge, I collected and sorted out this series

Address: http://www.cnblogs.com/lzrabbit/archive/2012/04/22/2465313.html    ArticleGuide SQL query for where in Use charindex or like to implement where in parameterization Use exec to dynamically Execute SQL to implement where in

SQL Server Index Structure and usage (III)Author: freedk I. An in-depth understanding of the index structureIi. Improve SQL statements General paging display and storage process for small data volumes and massive data Creating a Web application

Second kill is no stranger. Second kill is more of a reflection on concurrency for our programmers. It may be a genius to consider how to make a second kill to sweep the "second kill ". The last day was invited to optimize the SQL statement for the