SQL Server

1. PRIMARY KEY constraint (PRIMARY key)A PRIMARY KEY constraint can define a primary key value in a table that uniquely identifies each record in the table and can have only one PRIMARY KEY constraint per table (only one PRIMARY KEY constraint does

First Paradigm (1NF)(Must have primary key, column is not divided)Any field in a database table is a single attribute and cannot be divided CREATE TABLE AA (ID int,nameage varchar (100))Insert AA values (1, ' infinity-female ')Did not reach the

# #好久一段时间没有更新学习笔记, Inertia is something to overcome.This Saturday, July 4, is about to practice a thing that has not been done before. Why use the word practice? Because, Citrixxendesktop also not have not touched, just before are do POC, really did

Update Dt_article_attribute_value Set end_time = DATEADD

It is often encountered in statistical reports where the child table records are merged into one field. For example, the provincial table of the provincial economic level of the top five of the city statistics.As in the next two tables: dbo province

SQL Server CTP2 officially released on May 29Community Technology Preview (Community Technology previews) is for testing purposes only and should not be installed and used in a production environment. When you install the official version in a

--If you "Prohibit schema changes" in advance, the new columns will not automatically add a large release, you should use Sp_articlecolumn to add the column exec sp_changepublication @publication = N ' publication ', @ property = N ' Replicate_ddl ',

--1. Creating a new Sqlserverext project, writing a C # method to generate a SqlServerExt.dll fileUsing System;Using System.Data;Using System.Data.SqlClient;Using System.Data.SqlTypes;Using System.Text.RegularExpressions;Using

First make sure that the two machines are on the same LAN, and then open the Configuration tool →sql Server Configuration Manager to configure. The TCP/IP (IP1) of the protocol that will be MSSQLSERVER. IP2) TCPPort changed to 1433, enabled instead

We often encounter this situation in a production environment:The front-end OLTP business is busy, but these operational data need to be OLAP, in order to not affect the front-end normal business, so the database needs to be read-write

First, write it in front.In a twinkling of an eye is a year Ching Ming festival, saying "Qingming season rain in succession", the weather in Wuhan with this Qingming festival under a rainstorm, the whole city as the sea, a circle of friends

# #本文档所有安装操作都使用自动化脚本----# # #安装脚本的参数```#!set[Email protected]//SA database passwordSqlcomponent=sqlengine,replication,fulltext,conn,bc,sdk,ssms,adv_ssms,snac_sdk,ocs//Mounting componentsCollation=arabic_bin//Sorting

Use [master] GO ALTER DATABASE [DB name] set RECOVERY simple with no_wait GO ALTER DATABASE [DB name] set RECOVERY simple gouse [database name] GO DBCC shrinkfile (N'[database log file name]'0, TRUNCATEONLY) go use [master] go ALTER

Nonsense not much to say, directly on the code, clean up after the log file is 1M[SQL]View Plaincopyprint? Use [master] GO ALTER Database [db name] SET RECOVERY simple with no_wait GO ALTER Database [db name] SET RECOVERY Simple GO

Original: SQL Server gets the highest value of data in each category/* Data as follows: Name Val Memo a 2 A2 (second value of a) a 1 a1--a first value a 3 a3:a third value B 1 b1--b first value B 3 b3:b third value B 2 b2b2b2b2 B 4 b4b4 B 5

The version of SQL Server database has Enterprise Edition, Standard Edition, Web Edition, Development Board. Enterprise Edition: can only be installed in the server operating system Database classification: Hierarchy: The organizational structure

--Modify the schema in bulk. All tables with the name Xjadminatt are modified to dbo----Copy the result of the execution to the command line and execute the command--Declare @namesysnameDeclareCsr1cursor for Selecttable_name

The leaf page of a clustered index stores the table's data. As a result, table rows are physically sorted by clustered index columns, because table data can only have one physical order, so a table can have only a single clustered index.When we

Examples of using wildcards in SQL Server: server wildcards In some cases, familiarity with the use of SQL Server wildcard can help us solve many problems. -- Use the _ operator to search for USEAdventureWorks2012, a three-letter name ending with an

SQL statement for query and automatic creation of Missing Index and sqlmissing SELECT migs.avg_total_user_cost*(migs.avg_user_impact/ 100.0) *(migs.user_seeks + migs.user_scans) ASimprovement_measure, 'CREATE INDEX[missing_index_' +