Hey Leetcode,

I want to thank you guys for creating those study plans, great job to motivate us to solve problems everyday :)

You guys added SQL study plan today, and the first plan (SQL I) is free, but there is a Premium-Only question at Day 4 - Union & Select. Continuning the previous pattern for other sudies, it shouldn't be there.

Is there a reason for that?

Once again, thanks for the effort and awesome job

Cheers