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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. For FLOAT, the SQL standard permits an optional specification of the precision (but ...
https://dev.mysql.com/doc/refman/8.0/en/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 ...
https://dev.mysql.com/doc/refman/8.0/en/numeric-type-syntax.html
For integer data types, M indicates the minimum display width. Display width is unrelated to the range of values a type can store, as described in Section 13.1.6, “Numeric Type Attributes”. For floating-point and fixed-point data types, M is ...
https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
When an operator is used with operands of different types, type conversion occurs to make the operands compatible. For example, MySQL automatically converts strings to numbers as necessary, and vice versa. mysql> SELECT 1+'1'; -> 2 mysql> SELECT ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/en/cast-functions.html
Table 14.15 Cast Functions and Operators Name Description Deprecated BINARY Cast a string to a binary string 8.0.27 CAST() Cast a value as a certain type CONVERT() Cast a value as a certain type Cast functions and operators enable conversion of ...
https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html
ABS(X) Returns the absolute value of X, or NULL if X is NULL. An implication of this is that ABS(-9223372036854775808) produces an error because the result cannot be stored in a signed BIGINT value. mysql> SELECT ABS(2); -> 2 mysql> SELECT ABS(-32); ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html
This section summarizes what has been added to, deprecated in, and removed from MySQL 8.0. A companion section lists MySQL server options and variables that have been added, deprecated, or removed in MySQL 8.0; see Section 1.4, “Server and Status ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-examples.html
This section provides some examples that show precision math query results in MySQL. These examples demonstrate the principles described in Section 14.24.3, “Expression Handling”, and Section 14.24.4, “Rounding Behavior”. Consider the ...
https://dev.mysql.com/doc/refman/8.0/en/number-literals.html
Number literals include exact-value (integer and DECIMAL) literals and approximate-value (floating-point) literals. Numbers may be preceded by - or + to indicate a negative or positive value, respectively. Numbers represented in scientific notation ...