No cache version.
Caching disabled. Default setting for this page:enabled (code DEF204)If the display is too slow, you can disable the user mode to view the cached version.
Rechercher dans le manuel MySQL
12.25.1 Types of Numeric Values
The scope of precision math for exact-value operations includes
the exact-value data types (integer and
DECIMAL types) and exact-value
numeric literals. Approximate-value data types and numeric
literals are handled as floating-point numbers.
Exact-value numeric literals have an integer part or fractional
part, or both. They may be signed. Examples: 1,
.2, 3.4,
-5, -6.78,
+9.10.
Approximate-value numeric literals are represented in scientific
notation with a mantissa and exponent. Either or both parts may be
signed. Examples: 1.2E3,
1.2E-3, -1.2E3,
-1.2E-3.
Two numbers that look similar may be treated differently. For
example, 2.34 is an exact-value (fixed-point)
number, whereas 2.34E0 is an approximate-value
(floating-point) number.
The DECIMAL data type is a
fixed-point type and calculations are exact. In MySQL, the
DECIMAL type has several synonyms:
NUMERIC,
DEC,
FIXED. The integer types also are
exact-value types.
The FLOAT and
DOUBLE data types are
floating-point types and calculations are approximate. In MySQL,
types that are synonymous with
FLOAT or
DOUBLE are
DOUBLE PRECISION and
REAL.
Document created the 26/06/2006, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/mysql-rf-precision-math-numbers.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
