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https://dev.mysql.com/doc/refman/8.0/en/floating-point-types.html
The FLOAT and DOUBLE types represent approximate numeric data values. MySQL uses four bytes for single-precision values and eight bytes for double-precision values. A precision from 24 to 53 results in an 8-byte double-precision DOUBLE column. For ...
https://dev.mysql.com/doc/refman/8.0/en/numeric-type-syntax.html
As of MySQL 8.0.17, the UNSIGNED attribute is deprecated for columns of type FLOAT, DOUBLE, and DECIMAL (and any synonyms); you should expect support for it to be removed in a future version of MySQL. In this case, MySQL performs a string-to-number ... For integer data types, M indicates the minimum display ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html
As of MySQL 8.0.20, the doublewrite buffer storage area resides in doublewrite files. Moving the storage area out of the system tablespace reduces write latency, increases throughput, and provides flexibility with respect to placement of doublewrite ... This section summarizes what has been added to, deprecated in, and removed from MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/json.html
If this mode is set, a single backslash instead of double backslashes can be used to insert the JSON object literal, and the backslashes are preserved. The key name must be specified within double quotation marks if the name without quotes is not ...
https://dev.mysql.com/doc/refman/8.0/en/windows-pluggable-authentication.html
The latter group name contains a space, so it must be quoted with double quote characters. Thus, these statements are equivalent: CREATE USER sql_admin IDENTIFIED WITH authentication_windows AS 'Rafal, Tasha, Administrators, "Power Users"'; CREATE ... Note Windows pluggable authentication is an extension included in MySQL Enterprise Edition, a commercial ...
https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html
The default number of decimal places displayed is seven, but MySQL uses the full double-precision value internally. Because the return value of this function is a double-precision value, its exact representation may vary between platforms or ...
https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html
If 25 <= p <= 53, the result is of type DOUBLE. This is actually FLOAT if the REAL_AS_FLOAT SQL mode is enabled; otherwise the result is of type DOUBLE. Table 14.15 Cast Functions and Operators Name Description Deprecated BINARY Cast a string to a ...
https://dev.mysql.com/doc/refman/8.0/en/problems-with-float.html
The FLOAT and DOUBLE data types are subject to these issues. The following example uses DOUBLE to demonstrate how calculations that are done using floating-point operations are subject to floating-point error. If columns d1 and d2 had been defined ... Floating-point numbers sometimes cause confusion because they are approximate and not stored as exact ...
https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
In all other cases, the arguments are compared as floating-point (double-precision) numbers. Comparisons between floating-point numbers and large integer values are approximate because the integer is converted to double-precision floating point ...
https://dev.mysql.com/doc/refman/8.0/en/gis-data-formats.html
WKB uses 1-byte unsigned integers, 4-byte unsigned integers, and 8-byte double-precision numbers (IEEE 754 format). A Point value has X and Y coordinates, each represented as a double-precision value. Two standard spatial data formats are used to ...