Calculate the SQL statement of the first day of the month of the given date.

Calculate the SQL statement of the first day of the last month and the last day of the month of the given date.

Calculate the SQL statement of the first day of the last month and the last day of the month of the given date.

Calculate the SQL statement of the first day of the last month and the last day of the month of the given date.

Declare @ date datetime
Set @ date = getdate ()
-- The first day of the current month minus one month
Select dateadd (month,-1, dateadd (month, datediff (month, 0, @ date), 0) as 'first day of last month'
-- Simplified
Select dateadd (month, datediff (month, 0, @ date)-) as 'Day of last month'
-- Another algorithm for the first day of the current month
Select dateadd (month,-1, dateadd (day, 1-datepart (day, @ date), @ date) 'Day of last month'
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