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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
SSCarpal Tunnel
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Group: General Forum Members
Points: 4249 Visits: 6431
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
SSC-Forever
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Group: General Forum Members
Points: 45022 Visits: 39887
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.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
T.Ashish
T.Ashish
Right there with Babe
Right there with Babe (767 reputation)Right there with Babe (767 reputation)Right there with Babe (767 reputation)Right there with Babe (767 reputation)Right there with Babe (767 reputation)Right there with Babe (767 reputation)Right there with Babe (767 reputation)Right there with Babe (767 reputation)

Group: General Forum Members
Points: 767 Visits: 582
May be he want to learn about sub-queries.
dwain.c
dwain.c
SSCarpal Tunnel
SSCarpal Tunnel (4.2K reputation)SSCarpal Tunnel (4.2K reputation)SSCarpal Tunnel (4.2K reputation)SSCarpal Tunnel (4.2K reputation)SSCarpal Tunnel (4.2K reputation)SSCarpal Tunnel (4.2K reputation)SSCarpal Tunnel (4.2K reputation)SSCarpal Tunnel (4.2K reputation)

Group: General Forum Members
Points: 4249 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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