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/********************* Character Set (character) and proofing Rules (collation) ****************************/Description: The character set is used to define how MySQL stores strings, and proofing rules are used to define how strings are compared;

Ensureindex () methodTo create an index, you need to use the Ensureindex () method of MongoDB.Grammar:The basic syntax for the Ensureindex () method is as follows yiibai.com >db. Collection_name. Ensureindex({KEY:1 The key here is to

ArticleDirectory Response results without Indexes Results Use SQL Use tools such as SQL Server Management Studio Basic indexing concepts Indexes and conditions The following table lists the index types available in SQL

Combination object,AlgorithmWhen I was just learning this lesson, I also looked down on him. Then he realized his importance when writing algorithms, especially the brute force method. Let's talk about his usefulness first. Some combination

Is null and is not null in SQL SERVER cause index failure ?, Sqlnull In fact, there is nothing to say about this problem. I encountered an SQL statement during optimization today. Because it is interesting, I have cut and simplified the SQL

For a summary of the cache, refer to: computer system a programmer's perspective original version _ second version Locality: The number or command recently operated by other commands, or itself. Good temporal locality: The referenced memory has been

About CPU Cache--The program apes need to know. This article will describe some of the CPU cache related knowledge that a program ape or it practitioner should know Article welcome reprint, but reproduced when please retain

This is an exam for 2014 Alibaba intern on the Beijing site: In MySQL, indexes belong to the storage engine level. Different storage engines implement indexes differently, such as MyISAM and InnoDB Storage engines. MyISAM index implementation: The

/ This article will describe some of the CPU cache related knowledge that a program ape or it practitioner should know Article welcome reprint, but reproduced when please retain this paragraph text, and placed on the top of

No free lunch in the world, this article reproduced in: http://cenalulu.github.io/linux/all-about-cpu-cache/ Let's take a look at a mind map of all the concepts in this article:Why do I need a CPU CacheAs the process has increased in recent

This is the two faces of the 2014 Beijing station. Ali intern problems are torn together:in the MySQL the. Indexes are the concept of storage engine level, and different storage engines implement indexes differently, such as the MyISAM and InnoDB

This text address:http://cenalulu.github.io/linux/all-about-cpu-cache/ Let's take a look at a mind map of all the concepts in this article.Why do I need a CPU CacheAs the process has increased in recent decades, CPU frequency has been

In fact, there is nothing to say about this problem, today's optimization encountered an SQL statement, because it is more interesting, so I intercepted, simplified the SQL statement, to show you, as shown belowDECLARE @bamboo_Code varchar (3);Set

This example describes the Zend_Registry object usage in the ZendFramework tutorial. For your reference, the object Registry (or object repository) is) the container that stores objects and values in the container. By storing objects in it, we

Zend Framework Tutorial Zend_registry Object Usage analysis, Zendzend_registry This example describes the Zend_registry object usage of the Zend Framework tutorial. Share to everyone for your reference, as follows: Using the Object Registry

This article mainly introduces the Zend_Registry object usage in the ZendFramework tutorial, and analyzes the specific functions and usage skills of the Object Registry Zend_Registry based on the instance form, for more information, see the

The code is as follows:Copy code SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGO/* By kudychen 2011-9-28 */CREATE function [dbo]. [SplitString](    @ Input nvarchar (max), -- input string to be separated@ Separator nvarchar (max) = ',', -- a string

This example describes the Zend_registry object usage of the Zend Framework tutorial. Share to everyone for your reference, specific as follows: Using the Object Registry (Registry) The object registry (or Object warehouse) is a container for

SETAnsi_nulls onGOSETQuoted_identifier onGO/**************** Split string ****************/CREATE function [dbo].[splitstring](@Input nvarchar(Max),@Separator nvarchar(Max)=',', @RemoveEmptyEntries bit=1 )returns @TABLE Table ([Id] int Identity(1,1),

Program Startup principle and UIApplicationFirst, UIApplication1. Brief introduction(1) The UIApplication object is a symbol of the application, and a UIApplication object represents an application. (2) Each application has its own UIApplication