what is in sql server

transactions and locks in SQL Server The transaction is all about Atomicity (atomicity). The concept of atomicity refers to the idea that some things can be treated as a unit. From a database standpoint, it refers to the smallest combination of one

The code to modify the database sa account name is as follows: Copy Code code as follows: Alter LOGIN SA DISABLE Alter LOGIN sa with NAME = [Systemaccount] "Systemaccount" is the new name for the SA, and when the execution

Each version of SQL Server has gradually become more and more self aligning and maintainable. However, requirements for basic maintenance, such as deleting index fragments, updating statistics, checking database consistency, and making backups are

Transferred from: http://www.cnblogs.com/micheng11/archive/2008/07/08/1237905.htmlThere are two ways to assign values to variables that are already defined in SQL Server, SET and SELECT, respectively.The differences between these two approaches are

Read Catalogue Brief introduction First, the general search conditions used like Second, like special case: Search wildcard characters Back to top introductionLike in sql: Use a good fuzzy query directive in SQL Server

What exactly is the data type uniqueidentifier in SQL Server? This type is typically used as a primary key and can be used to generate a unique value using the NEWID () of the SQL syntax.What I want to ask is, is this value a long

What is parallelism?We have heard from a young age, "more people, more power," "Good people," and so on, the core of the idea is to assign a task to many people, so that everyone only need to do a few things to complete the task. More importantly,

Create a new class library program named Regex, open Visual Studio 2008, click File, click New, click Project, select the class library in the New Project dialog box that pops up, and the project name is regex. Name the class Class1 in your

There are two ways to assign values to variables that are already defined in SQL Server, SET and SELECT, respectively.The differences between these two approaches are explained in more detail in SQL Server Books Online, but many times weDid not

A view is a virtual table whose contents are defined by a query. As with a real table, a view contains a series of column and row data with names. However, the view does not exist in the database as a stored set of data values. Row and column data

Recently a friend and I explored whether statements about where 1=1 and this form would affect performance. The final conclusion is not affected. Although the conclusion is correct, the understanding of the problem is far from the root of solving

IntroductionThe transaction log in SQL Server is undoubtedly one of the most important parts of SQL Server. Because SQL Server uses transaction logs to ensure persistence (durability) and transaction rollback (Rollback). This also partially ensures

partition table in SQL Server 2005 (iv): Delete (merge) a partitionCategory: SQL Server2009-12-04 09:10 8735 People read comments (0) favorite reports SQL Server2010functionmerge Storage DatabaseIn the previous section we described how to create

Original address: http://www.ncloud.hk/%E6%8A%80%E6%9C%AF%E5%88%86%E4%BA%AB/export-query-result-as-json-format-in-sql-server-2016/Use the FOR JSON clause to export the query results as a JSON string, as an attribute that is first available in SQL

For SQL Server databases, performance has been a topic that is not always around. And when we analyze and study performance issues, the execution plan is one of the priorities we've been focusing on.We know that at compile time, SQL Server chooses a

Write in front: This is the first T-SQL query Advanced series article. But the T-SQL query step-up series is far from finished. This topic is advanced and I think it is because this topic requires some advanced knowledge as the basis. If there is

The difference between Select count (*) and Count (1) in SQL server and the execution method, selectcount In SQL Server, Count (*), Count (1), or Count ([column]) is perhaps the most common aggregate function. Many people cannot tell the difference

SQL statement optimization and efficiency in SQL Server, serversql Many people do not know how SQL statements are executed in SQL server. They are worried that the SQL statements they write will be misunderstood by SQL SERVER. For example: Select *

Method 1: Use the BCP command bcp utility in Microsoft? SQLServer? 2000 repeat data between an instance and a data file in the format specified by the user. Syntax bcp {[[database_name.] [owner].] {table_name | view_name} | query} {in | out |

There are several ways to recover data in SQL Server: 1. Backup recovery method Backup This method is the safest and most reliable way to operate is simple, as long as you choose Restore in SQL Server Enterprise Manager. It can also be done with