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https://issues.apache.org/jira/browse/TRAFODION-3118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534235#comment-16534235
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ASF GitHub Bot commented on TRAFODION-3118:
-------------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/trafodion/pull/1622
> Improve on parts of EXTRACT constructs.
> ---------------------------------------
>
> Key: TRAFODION-3118
> URL: https://issues.apache.org/jira/browse/TRAFODION-3118
> Project: Apache Trafodion
> Issue Type: Improvement
> Reporter: chenyunren
> Assignee: chenyunren
> Priority: Major
>
> add DAYOFYEAR (with alias DOY), DAYOFWEEK (with alias DOW),
> WEEK（weekofyear）, WEEKOFMONTH, QUARTER, EPOCH,CENTURY, DECADE to function
> EXTRACT
>
> |century|The century
> support: datetime|EXTRACT(CENTURY FROM TIMESTAMP '2000-11-20 12:30:00');
> Result: 20
> EXTRACT(CENTURY FROM TIMESTAMP '2001-01-01 12:30:00');
> Result: 21|
> |decade|The year divided by 10
> support: datetime interval|EXTRACT(DECADE FROM TIMESTAMP '2001-02-16
> 20:38:40');
> Result: 200
> EXTRACT(DECADE FROM INTERVAL '9' YEAR - INTERVAL '99' YEAR);
> Result: -9|
> |week
> (weekofyear)|week number of year (1-53) (The first week starts on the first
> day of the year.)
> support: datetime|EXTRACT(WEEK FROM DATE '2005-01-01');
> Result:1|
> |epoch|the number of seconds since 1970-01-01 00:00:00 UTC (can be negative);
> for interval values, the total number of seconds in the interval
> support: datetime interval|EXTRACT(EPOCH FROM TIMESTAMP '2000-12-30
> 20:38:40.12');
> Result: 978208720.12
> EXTRACT(EPOCH FROM INTERVAL '2' YEAR - INTERVAL '3' MONTH)
> Result: 54885600|
> |quarter|The quarter of the year (1 - 4)
> support: datetime interval|EXTRACT(QUARTER FROM DATE '2007-02-16');
> Result: 1
> EXTRACT(QUARTER FROM INTERVAL '09' MONTH);
> Result: 3|
> |dow
> (dayofweek)|The day of the week as Sunday (1) to Saturday (7)
> support: datetime|EXTRACT(DOW FROM TIMESTAMP '2018-06-21 20:38:40');
> Result: 5|
> |doy
> (dayofyear)|The day of the year (1 - 365/366)
> support: datetime|EXTRACT(DOY FROM TIMESTAMP '2018-06-21 20:38:40');
> Result: 172|
> |wom
> (weekofmonth)|Returns a number for the count of week in the current
> month(1-5). (The first week starts on the first day of the month.)
> support: datetime|EXTRACT(WOM FROM TIMESTAMP '2018-06-21 20:38:40');
> Result: 3|
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