SQL Server

Usage of 1.NULL __2018-4-13 Usage of ISNULL () Note the difference between SET ANSI_NULLS on/off; Perform the following two comparison results:SELECT location,*FROM mfsysproduct WHERE location IS NULL; SELECT location,*FROM

SQL de-whitespace function1, LTrim (' content ')--Remove the space code to the left of the character as followsDECLARE @str varcharset @str = ' adfadf ' select @strselect ltrim (@str)2, RTrim (' content ')---Remove the space to the right of the

-- =======================================================================================================--Description: Updates the size of the tables in the query database and stores the results in the data table-- =================================

Preset conditions:Log in to SQL Server Management Studio using the SA account, right-click Security-Login-database username properties, set server role to sysadmin.Delete A stored procedure that already existsString job_bcp_delete_sql = "IF EXISTS

1. Tracking the specified databaseSELECT db_id (' Data name ')Original: https://jingyan.baidu.com/article/647f0115be128a7f2048a87d.html2. Column filter could not find the DatabaseIDCheck Show all columns before entering the column filter to

SQL SERVER migration to MySQL1. The first need to download a mediation software SQLyog. After the installation is complete, click on the target database to import, right click "Import", "Import external database";2. Click to start a new task3. Set

SQL Server copies the data into Excel format into a string, and the result data is stored in the first lattice.I clicked along with the title copy, and then pasted it into Excel, the result is this ....This is not the result I want, in the online

Original sticker: http://www.cnblogs.com/fygh/archive/2011/10/18/2216166.htmlTop 20 Ask the conceptual answer: http://blog.sina.com.cn/s/blog_81b2b2a101010ldu.htmlEach of the following links is a detailed and specific answer.1. The difference

20 million rows of data table, first of the Address field to do '%xxx% ' fuzzy queryThis is the estimated query planThis is the estimated actual query results, took 37 seconds to complete the queryOr the previous data, but this time using ' xxx% '

Original: SQL Server 2012 creating a DB SnapshotNot all MSSQL database versions support database snapshots and are supported only with Enterprise editions.In other versions, in the case of the business Intelligence Edition version, the following

    SQL Server Objectsencryption Method: Add "with Encryption" before the "as" position in the stored procedure, function, and "with encryption" in front of the "for" position, if it is a trigger. Decryption process: 1. Execute the following

Reference Documentation:Https://docs.microsoft.com/zh-cn/sql/t-sql/statements/set-transaction-isolation-level-transact-sqlhttps://msdn.microsoft.com/zh-cn/library/jj856598 (v=sql.120). aspxOne, the transaction isolation level controls the following

first, define variables--simple Assignment Declare @aintSet@a=5Print @a--Use the SELECT statement to assign a value declare @user1 nvarchar ( -) Select@user1 ='Zhang San'print @user1 declare @user2 nvarchar ( -) Select@user2 = Name

Summary: Before following some online tutorials, learned a little knowledge of ABP. Recently wanted to say migrate the default SQL Server data to MySQLFirst, a wave of internet searches.Installing MySql.Data.EntityThen you need to install MySql.Data.

Original: Remove and add publications in SQL Server replication without initializing all items--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

Method One:1, need to install pymssql　　pip install pymssql2. Connection code:import pymssqlconn=pymssql.connect(host=‘127.0.0.1‘,user=‘user‘,password=‘password‘,database=‘MyDB‘)cur=conn.cursor()cur.execute(‘select * from

A database in single-user (Single_user) mode can have only one connection at a time. Databases in restricted User (Restricted_user) mode can only accept connections that are considered "eligible" users--these users belong to the dbcreator or

The database used in a project is SQL Server R2 Express. I did not expect the express version of the features of some restrictions, has not been known before. Baidu Encyclopedia can see its limitations:"1. Database size limit: SQL Server 2005

Table structure--Student Table tblstudent (number stuid, name Stuname, age stuage, gender stusex)--Curriculum Tblcourse (Course number CourseID, course name Coursename, teacher number Teaid)--Score Table Tblscore (student number Stuid, course number

SQL Server transaction log is full solutionOne. Manual shrinkage:1. Database Right-click Properties-Options-recovery mode-drop-down selection simple-last hit OK2. Right-click Database-Task-shrink-File Type-dropdown Select log-shrink operation-not