FLOOR

Rounds down the returned value to the previous whole number. For example, given arguments of 5.01 and 5.99, FLOOR returns 5. FLOOR is the opposite of CEILING, which rounds up the returned value.

Behavior type

Syntax

FLOOR ( expression )

Parameters

expression

Resolves to an INTEGER or DOUBLE PRECISION value.

Examples

=> SELECT FLOOR((TIMESTAMP '2005-01-17 10:00' - TIMESTAMP '2005-01-01') / INTERVAL '7');
 FLOOR
-------
     2
(1 row)

=> SELECT FLOOR(-42.8);
 FLOOR
-------
   -43
(1 row)

=> SELECT FLOOR(42.8);
 FLOOR
-------
    42
(1 row)

Although the following example looks like an INTEGER, the number on the left is 2^49 as an INTEGER, while the number on the right is a FLOAT:

=> SELECT 1<<49, FLOOR(1 << 49);
    ?column?     |      floor
-----------------+-----------------
 562949953421312 | 562949953421312
(1 row)

Compare the previous example to:

=> SELECT 1<<50, FLOOR(1 << 50);
     ?column?     |        floor
------------------+----------------------
 1125899906842624 | 1.12589990684262e+15
(1 row)