EXTRACT

Compatibility

EXTRACT(YEAR FROM d)
Engine	OK	Alternative
ingres	Yes
mysql	Yes	YEAR(d)
oracle	Yes	TO_CHAR(d,'YYYY')
postgres	Yes	YEAR(d)
sqlserver	No	DATEPART(YEAR, d)

EXTRACT

EXTRACT allows you to retrieve components of a date.

You can extract also YEAR, MONTH, DAY, HOUR, MINUTE, SECOND.

  EXTRACT(YEAR FROM d)    EXTRACT(MONTH FROM d)
  EXTRACT(DAY FROM d)     EXTRACT(HOUR FROM d)
  EXTRACT(MINUTE FROM d)  EXTRACT(SECOND FROM d)

In this example you get the year and the hour from the date whn.

SELECT whn
      ,DATEPART(YEAR, whn)  AS yr
      ,DATEPART(HOUR, whn) AS hr
  FROM eclipse

SELECT whn
      ,EXTRACT(YEAR FROM td)  AS yr
      ,EXTRACT(HOUR FROM td) AS hr
  FROM gisq.eclipse

SELECT whn
      ,EXTRACT(YEAR FROM td)  AS yr
      ,EXTRACT(HOUR FROM td) AS hr
  FROM eclipse

See also

• + date

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