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ISO_DAY_OF_WEEK

Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition

Extract the ISO_DAY_OF_WEEK value from a datetime value.

The ISO_DAY_OF_WEEK function is a short version of the EXTRACT, passing a DatePart.ISO_DAY_OF_WEEK value as an argument.

SELECT iso_day_of_week(DATE '2020-02-03');

create.select(isoDayOfWeek(Date.valueOf("2020-02-03"))).fetch();

The result being (Monday = 1, ..., Sunday = 7)

+-----------------+
| iso_day_of_week |
+-----------------+
|               7 |
+-----------------+

Dialect support

This example using jOOQ:

isoDayOfWeek(Date.valueOf("2020-02-03"))

Translates to the following dialect specific expressions:

(((DATEPART(dw, '2020-02-03 00:00:00.0') + @@datefirst + 5) % 7) + 1)

weekday(TIMESTAMP '2020-02-03 00:00:00.0') + 1

extract(ISODOW FROM TIMESTAMP '2020-02-03 00:00:00.0')

DAYOFWEEK_ISO(TIMESTAMP '2020-02-03 00:00:00.0')

extract(ISO_DAY_OF_WEEK FROM TIMESTAMP '2020-02-03 00:00:00.0')

(weekday(TIMESTAMP '2020-02-03 00:00:00.0') + 1)

(mod(
  (EXTRACT(DAY_OF_WEEK FROM TIMESTAMP '2020-02-03 00:00:00.0') + 5),
  7
) + 1)

weekday({ts '2020-02-03 00:00:00.0'}) + 1

to_number(to_char(TIMESTAMP '2020-02-03 00:00:00.0', 'D'))

(((DATEPART(dw, CAST('2020-02-03 00:00:00.0' AS DATETIME2)) + @@datefirst + 5) % 7) + 1)

(((CAST(strftime('%w', '2020-02-03 00:00:00.0') AS int) + 6) % 7) + 1)

(mod(
  (DATEPART(dw, '2020-02-03 00:00:00.0') + @@datefirst + 5),
  7
) + 1)

/* UNSUPPORTED */

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