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Subqueries


Subqueries

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venk_sr
venk_sr
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1. I need to find the names of the customers who have purchased academic books. (Coding required as Subquery NOT as Join)


2. Here, I need to show a list of authors who have written books
and list the books they have written.
Sort the list by last name
(Coding required as Subquery)

Thanks in advance.
dwain.c
dwain.c
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Any time I see something like "Coding required as Subquery NOT as Join" it tells me for sure this is homework.

You'll find that few on this forum are willing to do your homework for you.

However if you make a fair attempt at solving the problem, we're likely to try to help you get it right.

Suggest you post some table DDL and sample test data in a consumable form, along with your first attempt.


My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!

My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.


Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
Since random numbers are too important to be left to chance, let's generate some!
Learn to understand recursive CTEs by example.
Splitting strings based on patterns can be fast!
My temporal SQL musings: Calendar Tables, an Easter SQL, Time Slots and Self-maintaining, Contiguous Effective Dates in Temporal Tables
Jeff Moden
Jeff Moden
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Points: 91208 Visits: 41151
dwain.c (11/10/2013)
Any time I see something like "Coding required as Subquery NOT as Join" it tells me for sure this is homework.

You'll find that few on this forum are willing to do your homework for you.

However if you make a fair attempt at solving the problem, we're likely to try to help you get it right.

Suggest you post some table DDL and sample test data in a consumable form, along with your first attempt.


+1 to all that. Well said on all fronts.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
T.Ashish
T.Ashish
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Group: General Forum Members
Points: 927 Visits: 599
May be he want to learn about sub-queries.
dwain.c
dwain.c
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Group: General Forum Members
Points: 7767 Visits: 6431
T.Ashish (11/11/2013)
May be he want to learn about sub-queries.


Good point! In that case, I suggest to check here:

http://beginner-sql-tutorial.com/sql-subquery.htm


My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!

My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.


Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
Since random numbers are too important to be left to chance, let's generate some!
Learn to understand recursive CTEs by example.
Splitting strings based on patterns can be fast!
My temporal SQL musings: Calendar Tables, an Easter SQL, Time Slots and Self-maintaining, Contiguous Effective Dates in Temporal Tables
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