255 characters

17/7/91. The master-slave architecture (Client-server model) or the client-server (CLIENT-SERVER) structure is called C/s structure, is a network architecture, usually in this network architecture software is divided into clients and servers. 2. The

Reprint Https://www.baidu.com/s?ie=UTF-8&wd=cnblogThe original tears Yunshan Hai blog MySQL data type1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (

MySQL has a large number of data types that can be divided into: date and time, numeric value, and string. Let's summarize them separately.Database type selection has a significant impact on the performance of the database1. Data types can affect

1, after the installation of MySQL and service startup, System Preferences have started the MySQL service button to see that running is available 2. Access MySQL via terminalGo to the MySQL path first (the default installation does not configure the

Data types for MySQL Integral type (xxxint) Floating-point type (float and double) Fixed-point number (decimal) String (Char,varchar,xxxtext) Binary data (XXXBLOB) Date Time Type Properties of the data type 1.

Date and time data types MySQL data type Meaning Date 3 bytes, date, format: 2014-09-18 Time 3 bytes, time, format: 08:42:30 Datetime 8 bytes, date time, format: 2014-09

This article transferred from: http://www.cnblogs.com/zbseoag/archive/2013/03/19/2970004.html1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m)

Oracle Database Type Character typechar[(length)] fixed length character up to 2000 bytesvarchar2[(length)] variable-length character data type with a maximum of 4000 bytesnchar[(length)] fixed-length character data type, composed of international

1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m) 2 byte range ( -32768~32767) Mediumint (M) 3 byte range ( -8388608~83

I. Overview1. What is a database?　A: Data warehouses, such as: In the ATM example we created a DB directory called the database2. What is MySQL, Oracle, SQLite, Access, MS SQL Server, etc.?　A: They are all software and have two main functions:

About MySQL1. What is a database?A database is a warehouse that organizes, stores, and manages data according to its structure, which is generated more than more than 60 years ago, with the development of information technology and markets,

1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m) 2 byte range ( -32768~32767) Mediumint (M) 3 byte range ( -8388608~83

First, the integral typeEach of the integers has both unsigned (unsigned) and signed (signed) types. MySQL data type Meaning tinyint (m) 1-byte representation: Signed ( -128~127); unsigned (0~255)

1, Charchar maximum length is 255 characters, note is character number and character set It doesn't matter. 1) can have default values,2) The trailing space will be truncated.3) 255 characters can be saved regardless of Chinese characters, English,

The MySQL query optimizer has several goals, but the primary goal is to use the index as much as possible, and use the most restrictive indexes to eliminate as many rows of data as possible.Your ultimate goal is to submit a SELECT statement to find

1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m) 2 byte range ( -32768~32767) Mediumint (M) 3 byte range ( -8388608~8388607

1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m) 2 byte range ( -32768~32767) Mediumint (M) 3 byte range ( -8388608~83

ObjectiveAs in C + +, how many bytes are required to define an int type, and how many bytes are required to define the double type, MySQL has strict control over the data in each column of the table, which is key to the success of the data-driven

Transferred from: http://www.cnblogs.com/zbseoag/archive/2013/03/19/2970004.html1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m) 2 byte

MySQL Char,varchar,text,blob is a few links but there are a lot of different types of fields, which is the basis of MySQL, but the foundation did not learn, bad to fill.Let's summarize briefly:Char: fixed length , maximum 255 charactersVARCHAR: