sql - Find dates that are not on the first or last day of the month -

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i have table named locations has column named effective_date many dates many years, , want retrieve not on first day of month or last day of month.

if effective_date columns of type date, sql query return rows non-null effective_date value other 1st or last day of month:

select t.effective_date , count(*) dbo.foo t 1 = 1 -- clarity   -- after 1st day of month   , t.effective_date > dateadd(day                 ,                            1-day( t.effective_date ) ,                                   t.effective_date                            )   -- , prior last day of month   , t.effective_date < dateadd( day                                ,                            -day( dateadd(month,1,t.effective_date) ) ,                                   dateadd(month,1,t.effective_date)                            )

if column carries time component it, is, of:

  • datetime
  • smalldatetime
  • datetime2
  • datetimeoffset

you'll want cover bases , modify query, like

select * dbo.foo t 1=1 -- added clarity   -- effective date on or after 2nd of month   , t.effective_date >= convert(date,                             dateadd(day                 ,                               2-day( t.effective_date ) ,                                      t.effective_date                               )                             )   -- , prior last day of month   , t.effective_date < convert(date,                            dateadd(day,                              -day( dateadd(month,1,t.effective_date) ) ,                                    dateadd(month,1,t.effective_date)                              )                            )

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