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 some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. For definitions of character string columns (CHAR, VARCHAR, and the TEXT types), MySQL interprets【ɪnˈtɜːrprəts诠释;说明;把…理解为;领会;口译;】 ...
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.
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...
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.) ...
Data type mapping occurs at table creation time, after which the original type specifications are discarded. If you create a table with types used by other vendors and then issue aDESCRIBEtbl_namestatement, MySQL reports the table structure using the equivalent MySQL types. For example: ...
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...
For information about all data types in each MySQL version, see theofficial MySQL documentation. The following table provides the support status of main data types in MySQL 8.0.X. Data type MySQL Reader for batch data read MySQL Writer for batch data write ...
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. ...