这些类型包括严格数值数据类型(INTEGER、SMALLINT、DECIMAL 和 NUMERIC),以及近似数值数据类型(FLOAT、REAL 和 DOUBLE PRECISION)。 关键字INT是INTEGER的同义词,关键字DEC是DECIMAL的同义词。 BIT数据类型保存位字段值,并且支持 MyISAM、MEMORY、InnoDB 和 BDB表。 作为...
For TIME, DATETIME, and TIMESTAMP columns, the storage required for tables created before MySQL 5.6.4 differs from tables created from 5.6.4 on. This is due to a change in 5.6.4 that permits these types to have a fractional part, which requires from 0 to 3 bytes. As of MySQL 5.6.4...
In SQL, each column has a data type that defines the kind of data that a column can store. In this tutorial, you will learn about Data Types in SQL with the help of examples.
MySQL DataType--定点数(Fixed-Point Types)学习 DECIMAL和NUMERIC MySQL支持两种定点数类型:DECIMAL和NUMERIC,而NUMERIC实现为DECIMAL,因此MySQL中DECIMAL和NUMERIC等价相同。 如使用下面建表语句: CREATETABLEtb003( idINTPRIMARYKEY, c1DECIMAL(20,5), c2 NUMERIC(18,5) )ENGINE=INNODBDEFAULTCHARSET=utf8; 表创建...
Fixed-Point Types Fixed-Point data types are used to preserve exact precision, for example with currency data. In MySQL DECIMAL and NUMERIC types store exact numeric data values. MySQL 5.6 stores DECIMAL values in binary format. In standard SQL the syntax DECIMAL(5,2) (where 5 is the precis...
SPATIALindexes can be created onNOT NULLspatial columns, so if you plan to index the column, declare itNOT NULL: CREATETABLEgeom(gGEOMETRYNOTNULL); For other examples showing how to use spatial data types in MySQL, seeSection 11.4.5, “Creating Spatial Columns”....
Thefspvalue, if given, must be in the range 0 to 6. A value of 0 signifies that there is no fractional part. If omitted, the default precision is 0. (This differs from the standard SQL default of 6, for compatibility with previous MySQL versions.) ...
MySQL Data Types (Version 8.0) In MySQL there are three main data types: string, numeric, and date and time. String Data Types Data typeDescription CHAR(size)A FIXED length string (can contain letters, numbers, and special characters). Thesizeparameter specifies the column length in characters...
In MySQL there are three main data types: string, numeric, and date and time. String Data Types Data typeDescription CHAR(size)A FIXED length string (can contain letters, numbers, and special characters). Thesizeparameter specifies the column length in characters - can be from 0 to 255. De...
The following is a table of integer types in MySQL:TINYINT,MEDIUMINTandBIGINTare MySQL extensions to the SQL standard. Table 1: Signed integer types The integer types differ in their storage. We can choose values that fit our requirements. ...