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 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...
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.) ...
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...
3 Fixed-Point Types (Exact Value) - DECIMAL, NUMERIC The DECIMAL and NUMERIC types store exact numeric data values. These types are used when it is important to preserve exact precision, for example with monetary data. In MySQL, NUMERIC is implemented as DECIMAL, so the following remarks abou...
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...
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...
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: ...
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. ...
ErrCode Array of Integer No MySQL error codes AuditPolicy Audit Policy Used by actions: DescribeAuditPolicies. NameTypeDescription PolicyId String Audit policy ID. Status String Audit policy status. Valid values:creating;running,paused;failed. InstanceId String Database instance ID CreateTime String Cr...