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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. For FLOAT, the SQL standard permits an optional specification of the precision (but not the range of the exponent) in bits following the keyword FLOAT in parentheses; ; that is, ...MySQL uses four bytes for single-precision values and eight bytes for double-precision ...
https://dev.mysql.com/problems-with-float.html
Floating-point numbers sometimes cause confusion because they are approximate and not stored as exact values. A floating-point value as written in an SQL statement may not be the same as the value represented internally. Attempts to treat ...For ...
https://dev.mysql.com/numeric-type-overview.html
For floating-point and fixed-point types, M is the total number of digits that can be stored. 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 ...For additional information about properties and storage requirements of the numeric types, see Section 11.2, “Numeric Types”, and Section 11.8, “Data Type Storage ...
https://dev.mysql.com/type-conversion.html
The arguments are compared as decimal values if the other argument is a decimal or integer value, or as floating-point values if the other argument is a floating-point value. In all other cases, the arguments are compared as floating-point (real) ...
https://dev.mysql.com/replication-features-floatvalues.html
Because conversions between decimal and binary representations of them may be approximate, comparisons involving floating-point values are inexact. This is true for operations that use floating-point values explicitly, or that use values that are ...
https://dev.mysql.com/precision-math-examples.html
The floating-point calculation introduces small errors: +--------+------------------+ | d | f | +--------+------------------+ | 1.0000 | 0.99999999999991 | +--------+------------------+ Example 2. Consider these statements: mysql> CREATE TABLE t (i ... This section provides some examples that show precision math query results in ...
https://dev.mysql.com/cast-functions.html
mysql> SELECT 1 - 2; -> -1 mysql> SELECT CAST(1 - 2 AS UNSIGNED); -> 18446744073709551615 mysql> SELECT CAST(CAST(1 - 2 AS UNSIGNED) AS SIGNED); -> -1 If either operand is a floating-point value, the result is a floating-point value and is not ...
https://dev.mysql.com/number-literals.html
Number literals include exact-value (integer and DECIMAL) literals and approximate-value (floating-point) literals. For example, 2.34 is an exact-value (fixed-point) number, whereas 2.34E0 is an approximate-value (floating-point) number. The FLOAT ...Numbers may be preceded by - or + to indicate a negative or positive value, ...
https://dev.mysql.com/mathematical-functions.html
For string or floating-point arguments, the return value has a floating-point type. For string or floating-point arguments, the return value has a floating-point type. (Note that π radians equals 180 degrees.) mysql> SELECT RADIANS(90); -> ...
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 ...
Document created the 26/06/2006, last modified the 26/10/2018
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