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SQL JOINS


SQL JOINS

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iamharidodda
iamharidodda
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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?
GSquared
GSquared
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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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iamharidodda
iamharidodda
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thanks for ur reply,
but this scenario, i need to use with ASP.NET applications in a single sql statement
Adam Angelini
Adam Angelini
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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
GSquared
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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
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Jeff Moden
Jeff Moden
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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.
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

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