Syntax

Purpose

ROUND(interval) returns the interval rounded up to the unit specified by the second argument fmt, the format model .

For INTERVAL YEAR TO MONTH, fmt can only be year. The default fmt is year.

For INTERVAL DAY TO SECOND, fmt can be day, hour and minute. The default fmt is day. Note that fmt does not support second.

ROUND(interval) rounds up on the mid value of next part of fmt as follows:

• If fmt is year, ROUND(interval) rounds up on the mid value of month which is 6.

• If fmt is day, ROUND(interval) rounds up on the mid value of hour which is 12.

• If fmt is hour, ROUND(interval) rounds up on the mid value of minute which is 30.

• If fmt is minute, ROUND(interval) rounds up on the mid value of second which is 30.

The result precision for year and day is the input precision for year plus one and day plus one respectively, since ROUND(interval) can have overflow. If an interval already has the maximum precision for year and day, the statement compiles but errors at runtime.

Examples

SELECT ROUND(INTERVAL '+123-06' YEAR(3) TO MONTH) AS year_round;

YEAR_ROUND
----------
+124-00

SELECT ROUND(INTERVAL '+99-11' YEAR(2) TO MONTH, 'YEAR') AS year_round;

YEAR_ROUND
----------
+100-00

SELECT ROUND(INTERVAL '-999999999-11' YEAR(9) TO MONTH, 'YEAR')AS year_round;

ORA-01873: the leading precision of the interval is too small

SELECT ROUND(INTERVAL '+4 12:42:10.222' DAY(2) TO SECOND(3), 'DD') AS day_round;

DAY_ROUND
-------------------
+05 00:00:00.000000