Обсуждение: Selecting weekdays from datetime

Howdy,

I have a database of mailing list entries where I would like to do
some statistics on activity on different days of the week. So say I
want to do something along the hypothetical lines of

SELECT COUNT(*) FROM table WHERE day_of_week(date) = 'Mon'

how do I go about doing that?

Martin

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Martin Christensen wrote:
>
> Howdy,
>
> I have a database of mailing list entries where I would like to do
> some statistics on activity on different days of the week. So say I
> want to do something along the hypothetical lines of
>
> SELECT COUNT(*) FROM table WHERE day_of_week(date) = 'Mon'
>
> how do I go about doing that?
>
> Martin
>

I believe

select count(*) from table where where to_char(day, 'Day') =
'Monday   '

should do it. Note the three space pad on the end of
'Monday   '
to make it the same length as 'Wednesday'