SQL Server

1. Nested Loop Join (Nested Loop Join) Algorithm: The idea is quite simple and straightforward: For each tuples in relation R, r compares them with every tuples in relation S in the JOIN condition field and filters out the qualified tuples. The

I am dealing with an SQL server database problem, but the SQL server trial on the computer has expired. So I want to reinstall it. However, after installing the server several times, the system prompts that the installation is unsuccessful at the

Everyone is familiar with the principles of database backup and recovery. However, how reliable is your current database backup? Can you go to bed with peace of mind? If the answer is yes, you don't have to spend more time reading the following. If

First, the table to be copied is imported to the remote data. Assume that the local table is named hw2 and there is a table named hw in the database with the same structure. There are already 20000 data records. After the import is successful, a

Data processing becomes more and more important and critical in modern enterprise operations, and may even become a bottleneck of enterprise development. the importance of data protection is self-evident. if an enterprise does not have a good data

SQL does not commonly use function summary and transactions, add or delete triggersDelete duplicate rows in distinctDeclare @ x declare a variableConvert (varchar (20), tscore. tenglish) type conversionCast (xx as varchar (10) type conversionWww.jb51

SQL statementCopy codeThe Code is as follows:Reverse (substring (reverse (Path), 1, charindex ('/', reverse (Path)-1 ))How can I retrieve the right character of the last special character in a string, for example, 10*20*300? How can I get 300?Use

When designing a primary key, consider the following:1. Meaningless: the meaning here is defined from the user's perspective. This meaningless solution also reduces database information redundancy to a certain extent. Some people often refer to the

Copy codeThe Code is as follows:Create function fGetStrBySplit(@ Source VARCHAR (max ),@ Index INT,@ SplitChar VARCHAR (1))RETURNS varchar (MAX)ASBEGINDECLARE @ Len INTDECLARE @ n INT = 0DECLARE @ ChIndex INTDECLARE @ Result VARCHAR (MAX)-- Get the

The string search function is frequently used recently.Including1. fully match the search string2. Fuzzy search for stringsBoth the CHARINDEX and PATINDEX functions return the starting position of the specified mode. PATINDEX can use wildcards, but

Copy codeThe Code is as follows:-- Begin Index analysis optimization related SQL-- Returns the index with the current database fragmentation rate greater than 25%.-- Run this statement to scan many data pages-- Avoid running when the system load is

Copy codeThe Code is as follows:Using System;Using System. Data;Using System. Configuration;Using System. Web;Using System. Web. Security;Using System. Web. UI;Using System. Web. UI. WebControls;Using System. Web. UI. WebControls. WebParts;Using

Of course there are other tools to do this, but this script will be useful if the customer does not allow you to install things in the server.Copy codeThe Code is as follows:DECLARE @ tbImportTables table (tablename varchar (128), deleted tinyint)--

For more information about OBJECTPROPERTY, see: http://msdn.microsoft.com/en-us/library/ms176105.aspx Errors are inevitable during development. To correct errors and normalize them. You can use the system stored procedures sp_rename and

An AuditLog is a B/S structure project.Each user can log on to the system, and the operation data (ADD, update, and delete) in the program must be recorded for operation tracking. The information will be inserted into the AuditLog table.Generally,

This is a frequently used paging storage process. I hope you can give me some advice.Copy codeThe Code is as follows:USE [a6756475746]GO/***** Object: StoredProcedure [dbo]. [tbl_order_SearchWhereAndPage] Script Date: 11/01/2011 09:37:39 ******/SET

A query is as follows:Copy codeThe Code is as follows:SELECT c. CustomerId, CompanyNameFROM MERs cWhere exists (SELECT OrderID FROM Orders oWHERE o. CustomerID = cu. CustomerID) How does EXISTS work? The OrderId field is returned by the subquery,

There is a table that you need to operate on in the background and want to dynamically add and delete fields to it. This feature may be fine, but it also needs to be modified together with the original two stored procedures for insertion and update.

The following describes how to use SQL to query consecutive code segments in your database. If you are interested in SQL queries, you may wish to take a look. There is a table structure,Fphm, kshmInt32 00000001Int32 00000002Int32 00000003Int32 00000

Method 1: Copy codeThe Code is as follows:Code provided by Minimsdn.com:-- Turn ON [Display IO Info when execute SQL]SET STATISTICS IO ON-- Turn OFF [Display IO Info when execute SQL]SET STATISTICS IO OFF Link: