SQL Server

Create an IMG table in the database, which contains an IMG field, type: image or binary 'Store bytes into the database Dim stream as new IO. memorystream Picturebox1.image. Save (stream, system. Drawing. imaging. imageformat. BMP) Stream. Flush (

SQL Server provides two data types to store character information. In SQL ServerProgramThe two data types are roughly the same. The difference is that nvarchar is used to store Unicode data that processes multilingual data in database charts. Other

When writing SQL statements that query by time period, we generally write the query conditions as follows: Where date> = '2014-01-01 'and date However, some SQL statements are converted into the following: Where date> = '2014-01-01 0:00:00 'and

Solution:Use System. dbnull. Value to give dsenddate a default date, and then make a judgment when adding it.// Assume that dsenddate is the date content you saved to the database, and make the following judgment:If (dsenddate. to1_datestring ()! = "

SQL Server Program Users often need to write T-SQL in SSMs (SQL Server Management studio) or query analyzer (before 2000) Code . The following skills can improve work efficiency. The following describes ss2005 as an example, and ss2008 also

During routine maintenance of SQL Server, you can view the SQL Server Error Log to confirm the running status of the service, such as service start/stop, backup and restore operations, and logon authentication, you need to check it regularly. You

Use environment: determines whether a string is contained in a paragraph of text. Usage: The charindex and patindex functions are often used to search for characters or strings in a string. If the searched characters contain the characters to be

Every system cannot avoid list pages, while list pages generally require pagination. Although all languages provide the internal paging function, the efficiency is very poor when there is a large amount of data, especially in the B/S architecture.

@ IdentityReturns the last inserted id value. Syntax@ Identity Return typeNumeric NoteAfter an insert, select into, or large-capacity copy statement is completed, @ identity contains the final id value generated by this statement. If this

Make a comprehensive comparison between the title char and varcharSource: [ogdev] Browse: [86] It is proved that Char has better performance than varchar when the character length is certain, while char fields have slightly worse performance when

Reading images is much easier than storing images. To output an image, we must use the binarywrite method of the response object. Set the image format. In this article, we will discuss how to retrieve images from sqlserver. I will also learn the

BCP is a command line tool used in SQL Server to import and export data. It is based on DB-library and can efficiently import and export large batches of data in parallel. BCP can be used to export tables or views of a database, or filter tables or

The first and last days of a known year are obtained in the project. I think the network is good and I will leave it as a backup.1. The first day of a month Select dateadd (mm, datediff (mm, 0, getdate (), 0) 2. Monday of the week Select dateadd (

-- ===================================================== ====== -- Author: -- Create Date: -- Description: -- ===================================================== ====== Alter function [DBO]. [split] ( @ String varchar (255, @ Separator char = ',

Create a table: Create Table [testtable] ([ID] [int] identity (1, 1) not null,[Firstname] [nvarchar] (100) Collate chinese_prc_ci_as null,[Lastname] [nvarchar] (100) Collate chinese_prc_ci_as null,[Country] [nvarchar] (50) Collate chinese_prc_ci_as

In the current Internet application development process, it is often found that the query or operation data speed is slow. There are many causes, which are common:1. No index or no index is used (this is a defect in Database Design)2. Low I/O

Syntax Set xact_abort {on | off} When set xact_abort is on, if a running error occurs in a Transact-SQL statement, the entire transaction is terminated and rolled back. When it is off, only the wrong Transact-SQL statement is returned, and the

Step 1. Optimize the application workload The first step to optimize application performance is to optimize the workload. The optimization steps listed in this part of optimization methodology can solve many common performance and scalability

My project is similar to that of Baidu. Of course it is much easier to know than Baidu. On a problem sharing platform, if the user does not handle the problem within the specified period (the user does not take the correct answer, closes the problem,

For database optimization, we have already introduced it to you, that is, database Optimization for overall website optimization. This is applicable to most databases. SQL Server databaseWhat is the optimization of the stored procedure? In fact,