255 characters

Data types in MySQL1. 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

Source: http://blog.chinaunix.net/uid-10064369-id-2971161.htmlTable TypeMySQL has a lot of data table types, the more important of which is the myisam,innodb of these two kinds. Each of these two types has advantages and disadvantages, need to

Column type integer type tinyintMini-integer, the system takes one byte to hold the integer type, one byte =8byte, the maximum data is 0-255.smallintSmall integer, the system uses two bytes to save the integer type, can represent the integer type

1, download, install, configure the environment2. Database operation3, user rights, authorization management4. Data table operation5, data row operation1, download, installation, configuration environment (slightly)2. Database operation2.1. Display

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

One, non-numeric type Type Range Description Char (N) [binary] n=1~255 charactersBinary: Distinguish case Fixed length Std_name Cahr (+) NOT NULL VarChar (N) [binary] n=1~2

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

MySQL Introduction 1, 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,

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

Mysql************************************Current column ClassName ColumnType displaysize TypeName0:java.lang.integer Columntype:4 One Integer1:java.lang.integer columntype:-6 4 TINYINT2:java.lang.string Columntype:12 0 UNKNOWN3:java.lang.boolean

First, the number type Type Range Description Char (N) [binary] n=1~255 charactersBinary: Distinguish case Fixed length Std_name Cahr (+) NOT NULL VarChar (N) [binary] n=1~

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

1. The most basic dbms_output. Put_Line () method. Anywhere, as long as it is between begin and end, you can use Dbms_output. Put_Line (output); However, there is a problem with using this function to display up to 255 characters at a time,

About the fields in MySQL Type value Type description Mysql_type_tiny tinyint field Mysql_type_short smallint field Mysql_type_long

1 bytes = 8 bits tinyint is a byte 2 of 8 times = 256 so store up to 256Date and time data types MySQL data type Meaning Date 3 bytes, date, format: 2014-09-18 Time 3 bytes, time, format: 0

Data type Use Text Any combination of characters, numbers, or characters and numbers that cannot be used for calculations. A maximum of 255 characters, with a default length of 50 characters. For the specified size, the

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

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

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