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select extract(dow from datefield) extract a number from 0 to 6, where 0 is Sunday; is there a way to get the day of the week in SQL assuming that weeks start on Monday (so 0 will be Monday)?
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In PostgreSQL you can use the extract() function to get the day from a date. You can also use date_part() to do the same thing. When extracting the day from a date, you need to specify what sense of the word “day” you mean. For example, “day of week”, “day of month”, “day of year”, etc.
MySQL DAYOFWEEK() Function The DAYOFWEEK() function returns the weekday index for a given date (a number from 1 to 7). Note: 1=Sunday, 2=Monday, 3=Tuesday, 4=Wednesday, 5=Thursday, 6=Friday, 7=Saturday.
In PostgreSQL you can use the extract () function to get the day from a date. You can also use date_part () to do the same thing. When extracting the day from a date, you need to specify what sense of the word “day” you mean. For example, “day of week”, “day of month”, “day of year”, etc.
When extracting the day from a date, you need to specify what sense of the word “day” you mean. For example, “day of week”, “day of month”, “day of year”, etc.
PostgreSQL 's approach uses the month from the earlier of the two dates when calculating partial months. For example, age ('2004-06-01', '2004-04-30') uses April to yield 1 mon 1 day, while using May would yield 1 mon 2 days because May has 31 days, while April has only 30. Subtraction of dates and timestamps can also be complex.
Create the column which extracts day of week from timestamp column Within the Extract keyword we have to mention DOW as we are getting day of week from timestamp
From the manual
isodow The day of the week as Monday (1) to Sunday (7) So, you just need to subtract 1 from that result:
psql (9.6.1) Type "help" for help. postgres=> select extract(isodow from date '2016-12-12') - 1; ?column? ----------- 0 (1 row) postgres=> Use date_part Function dow()
Here 0=Sunday, 1=Monday, 2=Tuesday, ... 6=Saturday
select extract(dow from date '2016-12-18'); /* sunday */ Output : 0
select extract(isodow from date '2016-12-12'); /* Monday */ Ouput : 1
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