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Data types
198
REAL
Corresponds to a single precision floating-point number equivalent to the C language float
type.
DOUBLE PRECISION
Corresponds to a double precision floating-point number equivalent to the C language
double type.
FLOAT [ ( precision ) ]
Corresponds to a double precision floating-point number of the given precision, in bytes.
By default, FLOAT columns have a precision of 8. The REAL data type is same as a
FLOAT(4), and double-precision is the same as a FLOAT(8).
Date-time data types
Date-time data types are used to define points in time. This is the syntax for the date-time data
types:
Syntax
DATE | TIME | TIMESTAMP |TIMESTAMP WITH TIME ZONE
DATE
TIME
Stores a date value as three parts: year, month, and day. The ranges for the parts are:
• Year: 1 to 9999
• Month: 1 to 12
• Day: Lower limit is 1; the upper limit depends on the month and the year
Stores a time value as four parts: hours, minutes, seconds, and milliseconds. The ranges
for the parts are:
• Hours: 0 to 23
• Minutes: 0 to 59
• Seconds: 0 to 59
• Milliseconds: 0 to 999
TIMESTAMP
Combines the parts of DATE and TIME
TIMESTAMP WITH TIME ZONE
Combines the elements of TIMESTAMP with a time zone offset