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Code Issues

Update doc for DATEADD and DATEDIFF.

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robocop 2008-04-12 12:43:58 +00:00
parent 363ba2aa23
commit 7cc216e732
1 changed files with 11 additions and 5 deletions
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16
doc/sql.extensions/README.builtin_functions.txt
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@ -276,12 +276,16 @@ Format:
DATEADD( <number> <timestamp_part> TO <date_time> )
DATEADD( <timestamp_part>, <number>, <date_time> )
timestamp_part ::= { YEAR | MONTH | DAY | HOUR | MINUTE | SECOND | MILLISECOND }
timestamp_part ::= { YEAR | MONTH | DAY | WEEK | HOUR | MINUTE | SECOND | MILLISECOND }
Notes:
1) YEAR, MONTH, DAY and WEEKDAY could not be used with time values.
2) HOUR, MINUTE and SECOND could not be used with date values.
1) WEEKDAY and YEARDAY cannot be used. It doesn't make sense.
2) YEAR, MONTH and DAY could not be used with time values.
3) All timestamp_part values could be used with timestamp values.
4) When using hour, minute, second and millisecond for dateAdd and dates, the quantity added or
substracted should account at least for one day to produce effect (IE adding 23 hours to a date
doesn't increment it).
Example:
select dateadd(-1 day for current_date) as yesterday
@ -300,12 +304,14 @@ Format:
DATEDIFF( <timestamp_part> FROM <date_time> TO <date_time> )
DATEDIFF( <timestamp_part>, <date_time>, <date_time> )
timestamp_part ::= { YEAR | MONTH | DAY | WEEK | HOUR | MINUTE | SECOND | MILLISECOND }
Notes:
1) Returns positive value if the second value is greater than the first one,
negative when the first one is greater or zero when they are equal.
2) Comparison of date with time values is invalid.
3) YEAR, MONTH, DAY and WEEKDAY could not be used with time values.
4) HOUR, MINUTE and SECOND could not be used with date values.
3) WEEKDAY and YEARDAY cannot be used. It doesn't make sense.
4) YEAR, MONTH and DAY could not be used with time values.
5) All timestamp_part values could be used with timestamp values.