manual.texi Mods related to UNSIGNED floating-point types.

@cindex floating-point number

@tindex FLOAT

@tindex FLOAT(precision)

@item FLOAT(precision) [ZEROFILL]

@item FLOAT(precision) [UNSIGNED] [ZEROFILL]

A floating-point number. Cannot be unsigned.  @code{precision} can be

A floating-point number.  @code{precision} can be

@code{<=24} for a single-precision floating-point number and between 25

and 53 for a double-precision floating-point number. These types are like

the @code{FLOAT} and @code{DOUBLE} types described immediately below.

@code{FLOAT(X)} has the same range as the corresponding @code{FLOAT} and

@code{DOUBLE} types, but the display size and number of decimals is undefined.

@code{DOUBLE} types, but the display size and number of decimals are undefined.

In MySQL Version 3.23, this is a true floating-point value.  In

earlier MySQL versions, @code{FLOAT(precision)} always has 2 decimals.

@tindex FLOAT

@tindex FLOAT(M,D)

@item FLOAT[(M,D)] [ZEROFILL]

@item FLOAT[(M,D)] [UNSIGNED] [ZEROFILL]

A small (single-precision) floating-point number. Cannot be unsigned.

Allowable values are @code{@w{-3.402823466E+38}} to

@code{@w{-1.175494351E-38}}, @code{0}, and @code{@w{1.175494351E-38}} to

@code{3.402823466E+38}.  The @code{M} is the display width and @code{D} is the

number of decimals.  @code{FLOAT} without arguments or @code{FLOAT(X)} where

@code{X} <= 24 stands for a single-precision floating-point number.

A small (single-precision) floating-point number.  Allowable values are

@code{@w{-3.402823466E+38}} to @code{@w{-1.175494351E-38}}, @code{0},

and @code{@w{1.175494351E-38}} to @code{3.402823466E+38}.  If

@code{UNSIGNED} is specified, negative values are disallowed.  The @code{M}

is the display width and @code{D} is the number of decimals.  @code{FLOAT}

without arguments or @code{FLOAT(X)} where @code{X} <= 24 stands for a

single-precision floating-point number.

@tindex DOUBLE

@tindex FLOAT(precision)

@item DOUBLE[(M,D)] [ZEROFILL]

@item DOUBLE[(M,D)] [UNSIGNED] [ZEROFILL]

A normal-size (double-precision) floating-point number. Cannot be

unsigned. Allowable values are @code{@w{-1.7976931348623157E+308}} to

A normal-size (double-precision) floating-point number.

Allowable values are @code{@w{-1.7976931348623157E+308}} to

@code{@w{-2.2250738585072014E-308}}, @code{0}, and

@code{2.2250738585072014E-308} to @code{1.7976931348623157E+308}.  The

@code{2.2250738585072014E-308} to @code{1.7976931348623157E+308}.  If

@code{UNSIGNED} is specified, negative values are disallowed.  The

@code{M} is the display width and @code{D} is the number of decimals.

@code{DOUBLE} without arguments or @code{FLOAT(X)} where 25 <= @code{X}

<= 53 stands for a double-precision floating-point number.

@tindex DOUBLE PRECISION

@tindex REAL

@item DOUBLE PRECISION[(M,D)] [ZEROFILL]

@itemx REAL[(M,D)] [ZEROFILL]

@item DOUBLE PRECISION[(M,D)] [UNSIGNED] [ZEROFILL]

@itemx REAL[(M,D)] [UNSIGNED] [ZEROFILL]

These are synonyms for @code{DOUBLE}.

@tindex DECIMAL

@item DECIMAL[(M[,D])] [ZEROFILL]

@item DECIMAL[(M[,D])] [UNSIGNED] [ZEROFILL]

An unpacked floating-point number.  Cannot be unsigned.  Behaves like a

An unpacked floating-point number.  Behaves like a

@code{CHAR} column: ``unpacked'' means the number is stored as a string,

using one character for each digit of the value.  The decimal point and,

for negative numbers, the @samp{-} sign, are not counted in @code{M} (but

point or fractional part.  The maximum range of @code{DECIMAL} values is

the same as for @code{DOUBLE}, but the actual range for a given

@code{DECIMAL} column may be constrained by the choice of @code{M} and

@code{D}.

@code{D}.  If @code{UNSIGNED} is specified, negative values are disallowed.  

If @code{D} is omitted, the default is 0.  If @code{M} is omitted, the

default is 10.

@tindex DEC

@tindex NUMERIC

@item DEC[(M[,D])] [ZEROFILL]

@itemx NUMERIC[(M[,D])] [ZEROFILL]

@item DEC[(M[,D])] [UNSIGNED] [ZEROFILL]

@itemx NUMERIC[(M[,D])] [UNSIGNED] [ZEROFILL]

These are synonyms for @code{DECIMAL}.

point of that range.

As an extension to the ANSI/ISO SQL92 standard, MySQL also

supports the integral types @code{TINYINT}, @code{MEDIUMINT}, and

supports the integer types @code{TINYINT}, @code{MEDIUMINT}, and

@code{BIGINT} as listed in the tables above.  Another extension is

supported by MySQL for optionally specifying the display width

of an integral value in parentheses following the base keyword for the

of an integer value in parentheses following the base keyword for the

type (for example, @code{INT(4)}).  This optional width specification is

used to left-pad the display of values whose width is less than the

width specified for the column, but does not constrain the range of

complicated joins, as in these cases MySQL trusts that the

data did fit into the original column width.

All integral types can have an optional (non-standard) attribute

All integer types can have an optional (non-standard) attribute

@code{UNSIGNED}.  Unsigned values can be used when you want to allow

only positive numbers in a column and you need a little bigger numeric

range for the column.

As of MySQL 4.0.2, floating-point types also can be @code{UNSIGNED}.

As with integer types, this attribute prevents negative values from

being stored in the column.  Unlike the integer types, the upper range

of column values remains the same.

The @code{FLOAT} type is used to represent approximate numeric data

types. The ANSI/ISO SQL92 standard allows an optional specification of

the precision (but not the range of the exponent) in bits following the