weixin_39598094的博客I want to display the subtraction of two values from two different columns to a third column using a SQL query.This is the table structure:------------------------------------id | subject | Time1 | Ti...
姜小邑的博客 Also, don't use the implicit join syntax - it's considered an SQL Anti-pattern. I'be wrapped the date conversion in a CTE for readability here, but there's nothing preventing you from doing it inline...