SQL Server

1. Table Structure ID type productcode 1 pencil 0001 2 pencil 0002 3 pencil 0003 4 pen 0004 5 pen 0005 6 pen 0004 7 ballpoint pen 0007 8 ballpoint pen 0008 9 ballpoint pen 0007 2. Custom function fun CopyCodeThe Code is as follows: Go /*

Problem: When a. MDF file is attached to the database, the system prompts that the physical file cannot be opened. Operating System Error 5: "5 (Access denied)" error: 5120. Solution: the current account of the database has insufficient permissions

In forums, people often ask such questions.: Why is the result set of the same query sometimes arranged in the desired order, sometimes not, or in the order of SQL2000, to sql2005/2008? In fact, as long as "order by" is not specified in the

How to restore a backup from a backup device (Enterprise Manager)Restore a backup from a backup device Expand the server group and then expand the server. Expand the "Database" folder, right-click the database, point to the "all tasks" sub-menu,

Note: Windows XP cannot install the Enterprise Edition. win2000 \ win2003 Server I. Hardware and Operating System Requirements The following table describes the hardware requirements for installing Microsoft SQL Server 2000 or SQL Server Client

Copy codeThe Code is as follows: -- SQL Server 2000 SELECT a. name AS field name, CASE WHEN EXISTS (SELECT 1 FROM sysobjects WHERE xtype = 'pk' AND parent_obj = a. id AND name IN (SELECT name FROM sysindexes WHERE indid IN (SELECT indid FROM

Copy codeThe Code is as follows: -- Basic SQL operations -- Create a database Create database Studets -- Create a table Create table student (sno char (5), sname char (20), ssex char (2), sage smallint, sdept char (15 )) Create table course (cno

For general string fields in the program, SQL Server has char, varchar, nchar, and nvarchar types. What are the differences between these four types? Here we will make a comparison. 1. Fixed Length or variable length The so-called fixed length is

What is a trace tag? For DBAs, mastering Trace Flag is one of the necessary conditions for them to become masters of SQL Server. In most cases, Trace Flag is just a rare trick, but in many cases, these tags allow you to better control SQL Server

1. OUPUT parameter Return Value Copy codeThe Code is as follows: create procedure [dbo]. [nb_order_insert] ( @ O_buyerid int, @ O_id bigint OUTPUT ) AS BEGIN Set nocount on; BEGIN Insert into [Order] (o_buyerid) VALUES (@ o_buyerid) SET @ o_id = @

Copy codeThe Code is as follows:. The cursor method 1 DECLARE @ Data NVARCHAR (max) SET @ Data = '1, tanw; 2, keenboy '-- Id, Name DECLARE @ dataItem NVARCHAR (100)DECLARE data_cursor cursor for (SELECT * FROM split (@ Data ,';'))OPEN

Default. aspx Copy codeThe Code is as follows: No title page Cellspacing = "0">Style = "FONT-SIZE: 9pt; COLOR: # ffffff; HEIGHT: 16px; BACKGROUND-COLOR: # ff9933; TEXT-ALIGN: center">Write Data from the Access database to the SQL Server

1. subquery Concept(1) the judgment in the where clause of the query is based on the results of another query. This constitutes an external query and an internal query. This internal query is a self-query.(2) Self-query category1) Independent

Introduction Let's take an example. Create a new class in. NET, create a new method in this class, and then call this method in SQL Server. According to Microsoft, SQL Server 2.0 significantly enhanced the database programming model through the

For a database, you need to know more about the basic SQL statements. Below are some basic SQL statements. Create problems • Show database; displays existing databases• Use database_x; database database_x should be used now• Create table coffee (id

Filter is often used to filter out some records when writing SQL statements) Copy codeThe Code is as follows: where amount> 4000 and amount Of course, this does not mean the where clause of SQLSERVER. It means that does not use indexes for

Many people may mix the Primary Key and clustered index, or think this is the same thing. This concept is very incorrect. A primary key is a constraint attached to an index. This index can be a clustered index or a non-clustered index.Therefore, if

Error message: MSSQLSERVERSQLServerAgent cocould not be started (reason: SQLServerAgent must be able to connect to SQLServer as SysAdmin, but "(unknown)" is not a member of the SysAdmin role ). Running Environment: Windows2003R2 32bit + MSSQL2005

1. Create a new data table with the field id. Set the id as the primary key. Copy codeThe Code is as follows: create table tb (id int, constraint pkid primary key (id )) Create table tb (id int primary key) 2. Create a new data table with the

We know that SQL Server's data Row Storage has two data structures: A: heap B: B (binary Tree) Data is sorted and stored according to one of these two types. Friends who have learned the data structure should know the binary tree. Why is binary tree