对应的这 4 种 BLOB 类型,可存储的最大长度不同,可根据实际情况选择。 枚举与集合类型(Enumeration and Set Types) ENUM: 枚举类型,用于存储单一值,可以选择一个预定义的集合。 SET: 集合类型,用于存储多个值,可以选择多个预定义的集合。 空间数据类型(Spatial Data Types) GEOMETRY, POINT, LINESTRING, POLYGON...
MySQL 数据类型 数据类型指定特定类型的数据,如整数、浮点数、布尔值等。它还标识该类型的可能值、可以对该类型执行的操作以及该类型值的存储方式. 在 MySQL 中,每个数据库表都有许多列,并且每列都包含特定的数据类型。 我们可以通过以下特征来确定 MySQL 中的数据...
在MySQL中,数据类型(datatype)可以分为以下几类: 整型数据类型(Integer Types):包括TINYINT、SMALLINT、MEDIUMINT、INT、BIGINT等,用于存储整数数据。 浮点型数据类型(Floating-Point Types):包括FLOAT和DOUBLE,用于存储浮点数数据。 字符串数据类型(String Types):包括CHAR、VARCHAR、TEXT等,用于存储字符串数据。 日期...
MySQL Data Types Mysql gives numerous statistics types which are further grouped based on the form of the values stored in that data type columns. The data types can be broadly classified into the subsequent companies: We can discuss and examine the data types underneath each institution in the...
As of MySQL 8.0.17, the display width attribute is deprecated for integer data types; you should expect support for it to be removed in a future version of MySQL. If you specify ZEROFILL for a numeric column, MySQL automatically adds the UNSIGNED attribute to the column. ...
MySQL DataType--浮点数(Floating-Point Types)学习 浮点数(Floating-Point Types) MySQL支持两种浮点数类型来表示近似值: 1、FLOAT,单精度浮点数,使用4字节存储,存储数据范围3.402823466E+38 - -1.175494351E-38,0,1.175494351E-38 - 3.402823466E+38 2、DOUBLE,双精度浮点数,使用8字节存储,存储数据范围-...
In this part of the MySQL tutorial, we cover MySQL data types. A data type is a set of representable values. Each value belongs to one data type. Items that can be referenced by a name, such as SQL parameters, columns, fields, attributes, and variables, also have declared types. ...
2. A data type also specifies the possible values for that type, the operations that can be performed on that type and the way the values of that type are stored. MySQL data types MySQL supports a number ofSQL standard data typesin various categories. MySQL hasNumericTypes, theDATETIME,DATE...
The data type of a column defines what value the column can hold: integer, character, money, date and time, binary, and so on. MySQL Data Types (Version 8.0) Each column in a database table is required to have a name and a data type. ...
MySQL Data Types——Numeric 通用规则 INT型,可以设置显示宽度M(0-255),显示宽度并不影响实际值,当实际值比显示宽度大时会显示实际值; 浮点数(float、double)和定点数(decimal)有M,N可选,M代表总得数字个数,N代表M为数字中小数位数; 如果指定ZEROFILL,那么将自动加上UNSIGNED;...