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Rechercher dans le manuel MySQL
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https://dev.mysql.com/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/numeric-type-overview.html
As of MySQL 8.0.17, the UNSIGNED attribute is deprecated for columns of type FLOAT, DOUBLE, and DECIMAL (and any synonyms) and will be removed in a future MySQL version. In this case, MySQL performs a string-to-number conversion that involves no ...
https://dev.mysql.com/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/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/mysql-nutshell.html
The functions CAST() and CONVERT() now support conversions to types DOUBLE, FLOAT, and REAL. AUTO_INCREMENT support is deprecated for columns of type FLOAT and DOUBLE (and any synonyms). The UNSIGNED attribute is deprecated for columns of type ...
https://dev.mysql.com/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/c-api-prepared-statement-type-codes.html
The buffer_type member of MYSQL_BIND structures indicates the data type of the C language variable bound to a statement parameter or result set column. For input, buffer_type indicates the type of the variable containing the value to be sent to the ...
https://dev.mysql.com/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 ...
https://dev.mysql.com/gis-point-property-functions.html
These functions are available for obtaining point properties: ST_Latitude(p [, new_latitude_val]) With a single argument representing a valid Point object p that has a geographic spatial reference system (SRS), ST_Latitude() returns the latitude ...
https://dev.mysql.com/identifiers.html
The identifier quote character is the backtick (`): mysql> SELECT * FROM `select` WHERE `select`.id > 100; If the ANSI_QUOTES SQL mode is enabled, it is also permissible to quote identifiers within double quotation marks: mysql> CREATE TABLE "test" ... Certain objects within MySQL, including database, table, index, column, alias, view, stored procedure, partition, tablespace, resource group and other object names are known as ...
Document created the 26/06/2006, last modified the 26/10/2018
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