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extract function

  • Άρθρο

Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime

Returns field of source.

Syntax

extract(field FROM source)

Arguments

  • field: A keyword that selects which part of source should be extracted.
  • source: A DATE, TIMESTAMP, or INTERVAL expression.

Returns

If field is SECOND, a DECIMAL(8, 6). In all other cases, an INTEGER.

Supported values of field when source is DATE or TIMESTAMP:

  • YEAR, Y, YEARS, YR, YRS: The year field
  • YEAROFWEEK: The ISO 8601 week-numbering year that the datetime falls in. For example, 2005-01-02 is part of the 53rd week of year 2004, so the result is 2004
  • QUARTER, QTR: The quarter (1 - 4) of the year that the datetime falls in
  • MONTH, MON, MONS, MONTHS: The month field (1 - 12)
  • WEEK, W, WEEKS: The number of the ISO 8601 week-of-week-based-year. A week is considered to start on a Monday and week 1 is the first week with >3 days. In the ISO week-numbering system, it is possible for early-January dates to be part of the 52nd or 53rd week of the previous year, and for late-December dates to be part of the first week of the next year. For example, 2005-01-02 is part of the 53rd week of year 2004, while 2012-12-31 is part of the first week of 2013
  • DAY, D, DAYS: The day of the month field (1 - 31)
  • DAYOFWEEK, DOW: The day of the week for datetime as Sunday(1) to Saturday(7)
  • DAYOFWEEK_ISO, DOW_ISO: ISO 8601 based day of the week for datetime as Monday(1) to Sunday(7)
  • DOY: The day of the year (1 - 365/366)
  • HOUR, H, HOURS, HR, HRS: The hour field (0 - 23)
  • MINUTE, M, MIN, MINS, MINUTES: The minutes field (0 - 59)
  • SECOND, S, SEC, SECONDS, SECS: The seconds field, including fractional parts

Supported values of field when source is INTERVAL are (case-insensitive):

  • YEAR, Y, YEARS, YR, YRS: The total months / 12
  • MONTH, MON, MONS, MONTHS: The total months % 12
  • DAY, D, DAYS: The days part of interval
  • HOUR, H, HOURS, HR, HRS: How many hours the microseconds contains
  • MINUTE, M, MIN, MINS, MINUTES: How many minutes left after taking hours from microseconds
  • SECOND, S, SEC, SECONDS, SECS: How many seconds with fractions left after taking hours and minutes from microseconds

To return the three-letter acronym for the day of the week, use the dayname function.

Examples

> SELECT extract(YEAR FROM TIMESTAMP '2019-08-12 01:00:00.123456');
 2019

> SELECT extract(week FROM TIMESTAMP'2019-08-12 01:00:00.123456');
 33

> SELECT extract(DAY FROM DATE'2019-08-12');
 12

> SELECT extract(SECONDS FROM TIMESTAMP'2019-10-01 00:00:01.000001');
 1.000001

> SELECT extract(MONTHS FROM INTERVAL '2-11' YEAR TO MONTH);
 11

> SELECT extract(SECONDS FROM INTERVAL '5:00:30.001' HOUR TO SECOND);
 30.001000