Hello,

I want to make a query to made de diference between 2 rows of the same category nothing hard till here, but what i have to is to do this for 4-5 times because each row has a date, and i want to show the diference between current date and previous (yesterday) day. to can i do this ?

thanks!

Post the DDL for your tables
Post some sample data (as INSERT statements)
Post the expected output from he sample data