SQL "difference between" interview questions (part 2)

Описание к видео SQL "difference between" interview questions (part 2)

This is the second part of SQL interview questions.
The questions covered in this video are:
1) Difference between group by vs order by?
2) Difference between join vs sub query?
3) Difference between join vs union?

The part one video can be found here:
   • SQL "difference between" interview qu...  

Do check the video. The questions covered in first video are:
1) Difference between where and having?
2) Difference between union and union all?
3) Difference between in and exists?

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