check date between two dates or NULL in sql - mysql

Question

I want to check date in between two dates or can pass as a NULL
using stored proc
code
declare #fromDate date = null
declare #toDate date = null
select * from Mytable
where date betweeen #fromDate and #toDate OR NULL (how to check for both parameters)
I have other 2 more parameters so irrespective with date result should be displayed.
if #todate and #fromDate is NULL
please help.

Answer 1

Try with coalesce function as below
declare #fromDate date = null
declare #toDate date = null
select * from Mytable
where date between coalesce(#fromDate,date) and coalesce(#toDate,date)

Answer 2

Pretty much convert your English to SQL:
where (date is null or date betweeen #fromDate and #toDate)

Answer 3

When searching for a better solution than "between" with "coalesce" i found this thread:
firebird SQL
param is never NULL
createdatum is never NULL
offdatum can be NULL - for obvious reasons ;)
Initial solution:
where
X = :X
AND
cast(:QryDateTime as DATE) between
createdatum and coalesce(offdatum, cast(:QryDateTime as DATE))
problem there was a little tricky: when using "now" as value for QryDateTime there was (very rarely) no result found - even if there should exist one
Problem was that now is evaluated every time separately and obviously not in the left-to-right order.
I finally changed it to:
where
X = :X
AND
iif(offdatum is null, 1, iif(offdatum > cast(:QryDateTime as DATE), 1, 0)) = 1
AND
cast(:QryDateTime as DATE) > createdatum