MySQL using BETWEEN comparison with NULL

Question

I have a query with a where condition like so:

WHERE A.event_date BETWEEN B.start_date AND B.end_date

The complexity is that if B.sta

Answer 1

The COALESCE() function will return the first non-null value in the parameter list. Give this a try:

WHERE A.event_date BETWEEN COALESCE(B.start_date,'1900-01-01') and COALESCE(B.end_date,CURRENT_TIMESTAMP)