SQL JOINS

Question

SQL JOINS

iamharidodda

Grasshopper

Points: 16
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September 11, 2009 at 12:25 pm

#215037

Hi,
I have a question when I went for an interview.
let us say I have more than 5 tables and must join all the tables to get the required information.
but the interviewer asked me how can we get the same data what I am getting by joining all these tables with out using SQL JOINS or UNION command.
Q:Is there any other ways to get the data?

Viewing 6 posts - 1 through 5 (of 5 total)

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GSquared SSC Guru Points: 260824 More actions · Answer 1

You could insert the data from the first table into a temp table that has all the columns you want to end up with, then use update commands to pull in the data from the other tables one table at a time.

It's a dumb idea, but it does work.

- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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"Nobody knows the age of the human race, but everyone agrees it's old enough to know better." - Anon

iamharidodda Grasshopper Points: 16 More actions · Answer 2

thanks for ur reply,

but this scenario, i need to use with ASP.NET applications in a single sql statement

Adam Angelini SSCrazy Eights Points: 8548 More actions · Answer 3

select a.column1, b.column1 from table1 a,table2 b where a.column2 = b.column4

technically, it's a join, but doesn't use the join keyword. This style of join is going to be deprecated, so it is not recommended to use it.

GSquared SSC Guru Points: 260824 More actions · Answer 4

You could use correlated inline queries.

select Col1,

(select ColA

from dbo.Table2

where ColB = Table1.Col2) as ColA

from dbo.Table1;

This is even worse than the temp table solution, but it does fit the requirements given thus far.

I have to say, if anyone asked me this in an interview, I'd challenge it. "Why not use Join operations?" would be my response. Probably they just like trick questions to see if you can "think outside the box", but there are much better ways to accomplish that than asking you to avoid using a standard tool of the trade.

- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
Property of The Thread

"Nobody knows the age of the human race, but everyone agrees it's old enough to know better." - Anon

Jeff Moden SSC Guru Points: 1004403 More actions · Answer 5

I'm always fascinated by interviewers that think something needs to be done in a single SQL statement and I'm just as fascinated by interviewers that think you should generate such code from the application. So far as I'm concerned, the correct answer should be...

EXEC dbname.schemaname.storeprocedurename(list of parameters)

--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.

Change is inevitable... Change for the better is not.

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