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Author: GW? Reprint annotated Source??The SQL statement creates the table format:? CREATE table?? ( ??? [column-Level integrity constraints]? [, [column-Level integrity constraints] ...]? [,? );??--above is the format of the table if you do not

Reprint: Http://blog.csdn.net/jaketseng/archive/2007/06/03/2206513.aspxMySQL's numeric data types can be roughly divided into two categories, one is an integer and the other is a floating-point or decimal. Many different subtypes are available for

MySQL supports a number of data types, and choosing the right data type is critical to getting high performance. There is a simple principle in choosing to help make better choices .The simple principle:A, usually the smallest is the bestThis can

I. Preface Redis is not a simple key-value data container, it can not be understood as static storage data, it is a dynamic interaction of the data structure of the server, could be used as a cache, high-performance k-v database and so on. It

MySQL data types describe numeric types (integer type tinyint,smallint,mediumint,int,bigint; floating point decimal data type float and double, fixed-point decimal type Decimal), Date/Time type (year, Time,date,datetime,timestamp) and String types

The options for our system's selection box are stored in a database table, which roughly contains the ID of the selection box and the data for selecting options, roughly the following table. Where FieldID is of type int , Optionval is int ,

I. Overview of the MySQL engineThe 1.MyISAM Storage Engine MyISAM table is independent of the operating system, which means that it can be easily ported from a Windows Server to a Linux server, and whenever we build a table for a MyISAM engine, we

It suddenly occurred to me today that a sample of the tool from Astah-professional specialized in the ER diagram was used to get the Java code, a pretty good piece of code that only needs to be connected by JDBC to obtain database information,

Introduction: Recently looking at high performance MySQL, record writing study notes: High performance MySQL learning notes (ii) schema and data type optimization Note core content: How to choose the correct data type of MySQL, the difference

Original address: Http://social.technet.microsoft.com/wiki/contents/articles/4995.sql-server-columnstore-performance-tuning.aspxSQL Server's Columnstore index is a new version of SQL Server release that improves query performance for the Data

This article is from the "Spin Wood Technology Blog" blog, please be sure to keep this source http://mrxiong.blog.51cto.com/287318/1651098I. Numeric typeMySQL supports all numeric types in standard SQL, including strict data types

Numeric typeMySQL's numeric data types can be roughly divided into two categories, one is an integer and the other is a floating-point or decimal. Many different subtypes are available for each of these categories, and each subtype supports data of

MySQL supports a number of data types, and choosing the right data type is critical to getting high performance. There is a simple principle in choosing to help make better choices.The simple principle:A, usually the smallest is the bestThis can

Python uses UTF-8 encoding by default A python3 version of the HelloWorld code is as follows: #!/usr/bin/env pythonprint (' Hello world! ')If this Python script file is named: hello.py, there are two ways to run this script file: 1. Python hello.py

MySQL numeric data can be roughly divided into two types: one is an integer and the other is a floating point or decimal. Many different subtypes are available for each of these classes. Each subtype supports data of different sizes. MySQL allows us

ElasticSearch NEST notes, elasticsearchnest ElasticSearch NEST notes 1. What is ElasticSearch? ElasticSearch is a powerful open source search and analytics engine that makes data easy to learn E.   It can be simply understood as a indexing and

C # knowledge point, C # Cross-language and java cross-platform C # is an object-oriented language Three basic features of object-oriented architecture:1. Encapsulation2. Inheritance3. Polymorphism Output line breaksConsole. write ();Output line

Oracle string types: Oracle has four basic string types: CHAR, VARCHAR2, NCHAR, and NVARCHAR2. In Oracle, all strings are stored in the same format. The most comprehensive range of database blocks is 1 ~ The 3-byte length field is followed by the

Select the MYSQL column typeWhen creating a table, how does one determine which types to use? This section describes the factors that should be taken into account before making a decision. The most "common" column type is the string type. Any data

High-performance MySql evolution (1): Data Type optimizationThe database performance tuning process involves a lot of knowledge, including whether the attribute settings of fields are appropriate, whether the index is created properly, and whether