SQL Server

1. PRIMARY KEY constraint------I'm the most common (PRIMARY key) Limit: cannot be empty, data unique, one table only one Method: The table is built directly after the column type as follows:1 CREATE TABLE Studb 2 (3CHAR(PRIMARYKEY45

Due to the installation of VS2010 and the installation of SQL Server R2, there are some problems with SQL Server (for example: Begin...end ... Cannot be collapsed, causing the stored procedure to look hundreds of rows to be very painful), so simply

OverviewThe biggest advantage of AlwaysOn relative to database mirroring is the readable copy, which adds a new feature to the read-only route, which is to configure read-only routing to achieve read-write separation; Of course, the read-write

in this example, the begin Tran and with (holdlock) hints are used to observe the locks of SQL Server in the SELECT statement. The transaction is turned on to ensure that the lock is also observed by a very short query, because HOLDLOCK releases the

Using System;Using System.Collections.Generic;Using System.Text;Using Console = System.Console;Using Microsoft.Data.Odbc;Using System.Data;Using System.Data.SqlClient;Namespace ConsoleApplication1{Class Program{static void Main (string[]

Recently encountered a sort of SQL Server problem, have not known before, and then this time met.To find the problem with SQL Server sorting, the null value is the default in the specified column, because the null value defaults to the minimum value

Determine if the database exists if exists (SELECT * from dbo.sysobjects WHERE name = ' database name ')--drop database [DB name]Determine if the table exists if exists (SELECT * from dbo.sysobjects WHERE id = object_id (n ' [table name] ') and

IntroductionA physical failure, an operating system failure, or a SQL Server failure can cause a session between two availability replicas to fail. The availability replica does not periodically check the components on which Sqlservr.exe depends to

Both the database and C # are nullable types. Assign a value of nullparameters[9] to the field directly. Value = null; the execution of the error, a lot of, in short, it is a parameter less. Use the SQL Server Profiler tool to view the execution

First, the window function over the role of two:1, sort order by,row_number, flip page2, zoned area partition by, combined with aggregation function for a part of the data to summarizeSQL Server statements that turn pages:Select from Select as

A value in a field that is separated by a commaFind_in_set (' A ', ' a,b,c,d ') with CHARINDEX (', ' + ' B ' + ', ', ', ' + ' a,b,c ' + ', ') > 0 substitutionIi. examples of group_concat that mimic MySQLselect id,             val= ( select [value] +

When it comes to SQL Server programming or management, you will use the import and export of data, there are many ways to import and export, here is an example of SQL Server Import table data. Explain:1. Open SQL Server Management Studio. In Object

--recursive queryIF object_id('Digui','U') is not NULL DROP TABLEDiguiCREATE TABLEDigui (IdVARCHAR( -), ParentIDVARCHAR( -))INSERT intodbo. Digui (Id, ParentID)Select 'Third Floor','First Floor'Union Select 'Second Floor','First Floor'Union

Statistical continuous time period dataIf OBJECT_ID (n ' Test ', n ' U ') is not nulldrop table Testgo CREATE table Test (pscode decimal, Outputcode int,monitortime da tetime) insert INTO Testselect 4100000406,1,convert (datetime, ' 2015-04-01 00:00

154 Zhang Hao: this semester to learn a new course called the database of practical technology, mainly on the software SQL Server 2008 Learning, just beginning to learn nothing confused, after a week of study, slowly learned how to build a database,

Place the D:\wamp\bin\php\php5.5.12\ext path under theThese two files are copied to php.iniLink Database methods$serverName= "."; $connectionInfo=Array("Database" = "Yunjianyan", "UID" = "sa", "PWD" = "123"); $conn= Sqlsrv_connect

Turn from: Wang Poyang (PS: The current blog has been read, feel good, originally planned to write, then it is not enough time and Bo master write good, so turn around and slightly revised under)FOR XML PATH Some people may know that some people may

using OPENROWSET to blast SQL Server passwords The OPENROWSET function is a connection function provided by SQL Server. It can be used to connect a database using OLE DB and perform operations such as querying data. When you use this function, you

Tag: Code user run reload Word Eve Protocol computer requestThe day before 51, ready to start the database complete my remaining project code, the database Configuration Manager has a problem with the pain of the eggSqlserv Configuration Manager

I copy the schema and data of a database into a script, and then I create a new database to execute the script, but I am prompted with the following error:Problem Description:When a client server does not allow direct backup, it is often deployed by