SQL Server

The merge keyword is a magical DML keyword. It was introduced in SQL Server 2008, it can be insert,update,delete simple and as a sentence. MSDN's interpretation of the merge is very short: "Insert, update, or delete operations on the target table

After a period of study, but also some knowledge of the database, the database is basically composed of tables, relationships, operations; for beginners to learn the first picture wins "Ten" words: SQL Server Database SummaryA rough summary.After a

SQL Servercursors are generally used to traverse tables, andSQL Server can easily loop through cursors to implement SQL Server traversal records in tables. However, cursors are not recommended for actual development. We know that you can also

1.1 Introduction In SQL Server, the User-Defined table type refers to the type defined by the user-defined table structure. You can use a user-defined table type to declare Table value parameters for stored procedures or functions, or declare the

If windows Integrated Identity Authentication is used during SQL logon, the logon box displays the logon name in the format of "machine name \ current system user name" and the logon name and password are gray, user input is not allowed. I learned

Data Operations in databases are an important skill. data recovery and restoration are also common. I wonder if you have encountered an error message such as "device activation error during database recovery, please use the with move option to mark

Create a table, a primary key column, and an index column. Insert a batch of data and call select * from test_ B. It can be found that the output result is not sorted by Id, but by Type. If you want to order by Id, you can use the force index

With the development of the information age, more and more information systems are used, and more information is available. As the amount of information increases, data presentation, especially reports, is demanding more and more system presentation

By default, SQL Server is case insensitive. For example, userName = 'jesse 'and userName = 'jesse' have the same results. When verifying the password, you may need to be case sensitive to the string. You need to perform some processing to introduce

Steps for automatic backup in SQL Server 2005 database:In the left Toolbox (if not, press Ctrl + Alt + X), drag the "backup database task" to the yellow area in the middle. Double-click the task to be dragged out. The design attribute window is

　　1. A trigger is a special stored procedure. It cannot be explicitly called. Instead, it is automatically activated when a record is inserted, updated, or deleted into the table.Therefore, triggers can be used to implement complex integrity

Please follow these steps. Do not take the following steps if the previous steps are not performed to avoid damage to your database. Generally, steps 4 and 6 are not recommended. Steps 4 are not secure and may damage the database or cause data loss.

Recent projects mainly archive data and pull the data from one database to another, resulting in a large log file for the new database; or the log files are continuously increased during the use of the database, this reduces database performance and

Recently, I have been studying how to store big data files in databases. I have seen the FileStream function and recorded it for future use. FileStream is not enabled by default during installation. if you pay attention to it, there is a label

Php calls the Stored Procedure Code of mssql 2000, which I made yesterday. Let's take a look at the code for calling the stored procedure of mssql using php. $ Start = isset ($ _ GET ['start'])? $ _ GET ['start']: 0; $ End = isset ($ _ GET ['end'])

1. enable Ad Hoc Distributed Queries Enable the Ad Hoc Distributed Queries service before using openrowset/opendatasource. Because this service is insecure, SqlServer is disabled by default. How to enable Ad Hoc Distributed Queries SQL Server blocks

A deadlock occurs when two or more threads compete for a certain resource during execution. Without external force, they will not be able to push forward, and deadlocks may occur when they die. These processes that are always waiting for each other

SQL Server has a powerful replication function. In addition to replicating data and database objects from one database and distributing them accurately, it also implements synchronization between databases. SQL Server replication is divided into

Principle:Step 1: The application sends the SQL query statement to the server for execution.When we execute SQL statements at the data layer, the application will connect to the corresponding database server and send the SQL statements to the server

Chapter 7 multi-Table Design 1. A foreign key is a column in a table. It refers to a unique key in another table, generally a primary key. The foreign key is used to confirm that the rows in one table correspond to the rows in the other table. 2.