DATECEILING Function [Date and Time]

Calculates a new date, time, or datetime value by increasing the provided value up to the nearest larger value of the specified granularity.

Syntax

DATECEILING ( date-part, datetime-expression [,multiple -expression])

Parameters

Parameter	Description
date-part	The date part to be added to the date.
datetime-expression	The date, time, or date-time expression containing the value you are evaluating.
multiple-expression	(Optional). A nonzero positive integer value expression specifying how many multiples of the units specified by the date-part parameter to use within the calculation. For example, you can use multiple-expression to specify that you want to regularize your data to 200-microsecond intervals or 10-minute intervals. If multiple-expression evaluates to zero, evaluates to a negative number, is an explicit NULL constant, or is not a valid value for the specified date-part, Sybase IQ generates an error. If multiple-expression evaluates to a NULL, then the function result is NULL.

Parameter

Description

date-part

The date part to be added to the date.

datetime-expression

The date, time, or date-time expression containing the value you are evaluating.

multiple-expression

(Optional). A nonzero positive integer value expression specifying how many multiples of the units specified by the date-part parameter to use within the calculation. For example, you can use multiple-expression to specify that you want to regularize your data to 200-microsecond intervals or 10-minute intervals.

If multiple-expression evaluates to zero, evaluates to a negative number, is an explicit NULL constant, or is not a valid value for the specified date-part, Sybase IQ generates an error. If multiple-expression evaluates to a NULL, then the function result is NULL.

Examples

This statement returns the value August 13, 2009 10:40.00.000AM:

SELECT DATECEILING( MI, 'August 13, 2009, 10:32.00.132AM', 10) FROM iq_dummy

This statement returns the value August 13, 2009 10:32.35.456800 AM:

SELECT DATECEILING( US, 'August 13, 2009, 10:32.35.456789AM', 200 ) FROM iq_dummy

This statement returns the value August 13, 2009 10:32.35.600000 AM:

SELECT DATECEILING( US, 'August 13, 2009, 10:32.35.456789AM', 200000 ) FROM iq_dummy

This statement returns the value August 13, 2009 10:32.35.456789 AM:

SELECT DATECEILING( US, 'August 13, 2009, 10:32.35.456789AM') FROM iq_dummy

Usage

This function calculates a new date, time, or datetime value by increasing the provided value up to the nearest larger value with the specified granularity. If you include the optional multiple-expression parameter, then the function increases the date and time up to the nearest specified multiple of the specified granularity.

The data type of the calculated date and time matches the data type of the multiple-expression parameter.

The following date parts are not compatible with DATECEILING:

DayofYear
WeekDay
CalYearofWeek
CalWeekofYear
CalDayofWeek

If you specify a multiple-expression for the microsecond, millisecond, second, minute, or hour date parts, Sybase IQ assumes that the multiple applies from the start of the next larger unit of granularity:

Multiples of microsecond start from the current second
Multiples of millisecond start from the current second
Multiples of second start from the current minute
Multiples of minute start from the current hour
Multiples of hour start from the current day

For example, if you specify a multiple of two minutes, Sybase IQ applies two-minute intervals starting at the current hour.

For the microsecond, millisecond, second, minute, and hour date parts, specify a multiple-expression value that divides evenly into the range of the specified date part:

For hours, the valid multiple-expression values are: 1, 2, 3, 4, 6, 8, 12, 24
For seconds and minutes, the valid multiple-expression values are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
For milliseconds, the valid multiple-expression values are: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000

For microseconds, the valid multiple-expression values are:

1	40	400	4000	40000
2	50	500	5000	50000
4	64	625	6250	62500
5	80	800	8000	100000
8	100	1000	10000	125000
10	125	1250	12500	200000
16	160	1600	15625	250000
20	200	2000	20000	500000
25	250	2500	25000	1000000
32	320	3125	31250

If you specify a multiple-expression for the day, week, month, quarter, or year date parts, Sybase IQ assumes the intervals started at the smallest date value (0001-01-01), smallest time value (00:00:00.000000), or smallest date-time value (0001-01-01.00:00:00.000000). For example, if you specify a multiple of 10 days, Sybase IQ calculates 10-day intervals starting at 0001-01-01.

For the day, week, month, quarter, or year date parts, you need not specify a multiple that divides evenly into the next larger unit of time granularity.

If Sybase IQ rounds to a multiple of the week date part, the date value is always Sunday.

Standards and Compatibility

SQL—Vendor extension to ISO/ANSI SQL grammar.
Sybase—Not supported by Adaptive Server Enterprise or SQL Anywhere.