How do you combine multiple cron jobs into a single cron job for a single database (db) input?

Hi All, I have a db input created in the Splunk DB connect App. I want to execute a query based on a cron schedule. The problem is I want to run the first job every 45 mins starting from 0:00 to 12:00 and then the other cron job should run for every hour from 13:00 to 23:00. Is there any way to execute these 2 crons in a single cron job? Any help will be much appreciated. Thanks