Can I do a sub select statement in a view?

Is it possible to create sub select statements in a view?

I'm being asked to do something like this...

 SELECT  Distinct    dbo.Table1.Co1, dbo.Table2.Co2, dbo.Table3.Co3, dbo.Table4.Co4, dbo.Table5.Co6,
                 dbo.Table6.col4, Table7.col5

 FROM              dbo.Table1 INNER JOIN
                   dbo.Table2 ON dbo.Table1.Col5 = dbo.Table2.Co5 LEFT OUTER JOIN
                   dbo.Table3 ON dbo.Table4.Co4 = dbo.Table5.Col1 ( Where Col1='Code')LEFT OUTER JOIN
                   dbo.Table6 ON dbo.Table2.Col7 = dbo.Table7.Col5 LEFT OUTER JOIN  ... etc
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asked Jun 17, 2011 at 03:15 PM in Default

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1 answer: sort voted first

you can either move that WHERE snippet to the end of the query as a regular where clause, which makes sense with the left table of a LEFT OUTER JOIN...

... WHERE dbo.Table5.Col1='Code'

or you can do it inline like you have it with an and

dbo.Table4.Co4 = dbo.Table5.Col1 AND Table5.Col1 = 'Code'

though I do have to wonder why you would LEFT OUTER JOIN Table3 with a test for equality between columns Table4 and Table5 (maybe Table5.Col1 is Table1.Col5?)

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answered Jun 17, 2011 at 03:32 PM

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+1, Nails it.

Jun 18, 2011 at 02:56 AM Matt Whitfield ♦♦
  • I think KenJ addresses this, but be clear that with outer joins, a condition in the WHERE clause is different than putting it in the JOIN and can return different row sets. With all inner joins this distinction goes away.

Jun 18, 2011 at 09:20 AM Scot Hauder

Thanks Ken and Scot!

Also sorry to through you off with the LEFT OUTER JOIN...etc It was a quick rough example but I did get the answer on the correct syntax.

Jun 19, 2011 at 11:15 PM technette
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asked: Jun 17, 2011 at 03:15 PM

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Last Updated: Jun 17, 2011 at 03:26 PM

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