SQL Server

For some businesses, the storage of data in the table is exactly the same as the final result of reversing the source table. At this time, we encountered the problem of converting rows into columns, to simplify the problem, you do not have to worry

If you encounter an exception when using LINQ to SQL: SQL server does not handle comparison of ntext, text, XML, or image data types, ntext may be used in your database table fields, for the text, XML, or image type, you must add updatecheck = never

I suddenly thought of this problem recently and recorded it to consolidate my knowledge. Tables, temporary tables, and table variables are used by many people. truncate Table @ table variables may report errors. I believe many people have

Original article address: Http://www.cnblogs.com/thtfria/archive/2012/04/04/2432167.html   However, this project has been in the past n days, but the data synchronization section was initially some of my design ideas. This project is a

In SQL Server, the optimizer dynamically determines a low-cost connection policy between two tables based on the table or index structure and table data. SQL Server has three connection policies: Nested Loop Join, Merge Join, and Hash Join. Nested

  Create a database environment Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->use mastergoif not exists(select * from sysdatabases where name='stuDB')create database stuDBgo   Create a data table

InSQLServer, the view is a stored T-SQLQuery. View DefinitionSQLServer saves, so that it can be used as a virtual table to simplify queries, and adds another layer of security to the base table. However, it does not occupy any space in the database.

Original article: http://blog.csdn.net/ylqmf/article/details/4972034 Method 1 Write a function   -- String comparison functions that are case sensitive to stringsCreate function [dbo]. [StrComp] (@ Str1 NVARCHAR (50), @ Str2 NVARCHAR (50 ))Returns

This article summarizes how to save images to SQL Server in. Net WinForm and. Net WebForm (asp.net) and read the display method. 1. Use asp.net to upload images and store them in SQL Server. Then, read and display the images from SQL Server: 1)

Sqlserver2000, error when opening service manager: [Microsoft] [odbc SQL Server Driver] [dbnetlib] SQL server does not exist or access is denied"     [I] (A machine acts as a server and a client, and the software connection appears:[Dbnetlib]

[Transfer] http://www.cnblogs.com/CareySon/archive/2013/05/04/PlanCacheInSQLServer.htmlIntroduction The SQL statements we usually write are essentially the logic for obtaining data, rather than the physical path for obtaining data. When the SQL

1 -- zhxia 2 DECLARE @ username VARCHAR (20), @ flag BIT, @ ncount int 3 DECLARE mycursor cursor for -- DECLARE the CURSOR 4 SELECT user_name FROM RBAC_User 5 OPEN mycursor -- OPEN the cursor 6 SET @ flag = 0 7 SET @ ncount = 0 8 WHILE (@ flag = 0) 9

When we create a database and want to classify different types of databases scattered in different places in this new database, especially during data validation, purification, and conversion, there will be great challenges. Fortunately, SQL Server

1. To optimize the query, try to avoid full table scanning. First, consider creating an index on the columns involved in where and order. 2. Try to avoid null value determination on the field in the where clause. Otherwise, the engine will discard

At work, you often encounter backing up an application database. At the beginning, you may manually back up the database once a day, but after a long time, you may think of automatic backup, the following describes the automatic backup method that I

Visual C # tutorial on Dynamically Operating SQL Server database instances (6): Method for returning a field The preceding describes how to execute SQL statements with parameters and stored procedures with parameters.Method for returning a fieldIt

Use and optimization of SQL Server Indexes-------------------------------------------------------------------------------- In application systems, especially online transaction processing systems, data query and processing speed have become the

I. use tools to observe and analyze lock information in the database For concurrent systems and business systems with a large number of read/write database operations, when multiple people access the database at the same time, one of the most

SQL SERVER query performance optimization-analysis of transactions and locks (III)   Ii. Cause and related handling of deadlocks There are many causes of deadlocks, especially when the front-end application does not properly use transactions or

For xml path some people may not know. In fact, it shows the query result set in XML format, with this feature, we can simplify our query statements to implement some work that may previously need to be completed through the function live storage