The SQL EXISTS clause

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How to use the EXISTS clause in SQL. For beginners.

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Doug, you have helped me tremendously! When the part about NOT EXISTS was explained, this in itself shed light onto the exact problem I needed to mitigate. Thank you 🙂

vulcanstarlight

Very clear and to the point. Thanks a lot.

babybob

Thank you for the explanation. Very helpful.

adreamer

Thank you very much for such great content.

z

Fantastic video and exactly what I needed!

MethodOverRide

Thank you for making it understandable.

hieptrinh

Finally, someone answered the nagging question in my head, "Why not just use a join?" Thanks Doug!

kc

Thanks for your lesson that's easy to understand.

drpbekg

much thanks for your video! great explanation on this topic!

bagindamirza

Very good explanation. Tank you so much!

VincenzoCorvaglia

It cleared my doubts. Very very helpful.

debayan

Thx for the explanation. Do you mean exist will dedup and same with IN statement it will dedup too?

gbting

i don't understand. in the first example we get ALL CategoryNames from Categories if there is at least one row in subquery ? or only CategoryNames that have products?

sergeykurk

Thanks a lot. What does the query return if WHERE EXISTS returns false?

aspanon

can we use where exists. or where not exists with insert query ?

abdulsami

in subquey, can I select * or any random columns ? does it have to follow any patterns of select in subquery?

rcketRacoon

May I ask you why Joins are more popular than the Exists clause? At least when I go to interviews or I speak to people they always ask me about Joins but never about the Exists clause

laurafosci

in the first example (select 17) the exists is acting like a Boolean since the subquery is true so it brings everything in the outer query but in the 2nd example (the correlated query) exists is acting like "in" . how is that?

yeoshuabenzaken

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