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https://dev.mysql.com/doc/refman/5.7/en/other-vendor-data-types.html
To facilitate the use of code written for SQL implementations from other vendors, MySQL maps data types as shown in the following table. These mappings make it easier to import table definitions from other database systems into MySQL. If you create ...
https://dev.mysql.com/doc/refman/5.7/en/precision-math-numbers.html
The scope of precision math for exact-value operations includes the exact-value data types (integer and DECIMAL types) and exact-value numeric literals. The DECIMAL data type is a fixed-point type and calculations are exact. In MySQL, the DECIMAL ...Approximate-value data types and numeric literals are handled as floating-point ...
https://dev.mysql.com/doc/refman/5.7/en/built-in-function-reference.html
The following table lists each built-in (native) function and operator and provides a short description of each one. For a table listing functions that are loadable at runtime, see Section 12.2, “Loadable Function Reference”. ->> Return value ...
https://dev.mysql.com/doc/refman/5.7/en/user-variables.html
User variables can be assigned a value from a limited set of data types: integer, decimal, floating-point, binary or nonbinary string, or NULL value. Assignment of decimal and real values does not preserve the precision or scale of the value. (This ... You can store a value in a user-defined variable in one statement and refer to it later in another ...
https://dev.mysql.com/doc/refman/5.7/en/aggregate-functions.html
The SUM() and AVG() functions return a DECIMAL value for exact-value arguments (integer or DECIMAL), and a DOUBLE value for approximate-value arguments (FLOAT or DOUBLE). If GROUP_CONCAT() is invoked from within the mysql client, binary string ...
https://dev.mysql.com/doc/refman/5.7/en/numeric-types.html
These types include the exact numeric data types (INTEGER, SMALLINT, DECIMAL, and NUMERIC), as well as the approximate numeric data types (FLOAT, REAL, and DOUBLE PRECISION). The keyword INT is a synonym for INTEGER, and the keywords DEC and FIXED ...MySQL treats DOUBLE as a synonym for DOUBLE PRECISION (a nonstandard ...
https://dev.mysql.com/doc/refman/5.7/en/update.html
UPDATE is a DML statement that modifies rows in a table. Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET assignment_list [WHERE where_condition] [ORDER BY ...] [LIMIT row_count] value: {expr | DEFAULT} assignment: col_name = ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-trace-thread.html
in_max_runtime DECIMAL(20,2): The maximum number of seconds (which can be fractional) to collect data. in_interval DECIMAL(20,2): The number of seconds (which can be fractional) to sleep between data collections. Dumps all Performance Schema data ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-floatvalues.html
With statement-based replication, values are converted from decimal to binary. Because conversions between decimal and binary representations of them may be approximate, comparisons involving floating-point values are inexact. This is true for ...
https://dev.mysql.com/doc/refman/5.7/en/set.html
For a column specified as SET('a','b','c','d'), the members have the following decimal and binary values. A SET is a string object that can have zero or more values, each of which must be chosen from a list of permitted values specified when the ...