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  2. MIDRANGE-L
  3. August 2004

RE: Parentheses and JOINs?

Vern,

That's the way I understand it.

Charles


> Oh, wait, I think I begin to get it. A JOIN is a bracketed 
> clause that 
> starts with JOIN...  and ends with ...ON...  --  so that you 
> control the 
> nesting by where the ON goes.
> 
> Here's the example:
> 
> For example:
> TB1 LEFT JOIN TB2 ON TB1.C1=TB2.C1
> LEFT JOIN TB3 LEFT JOIN TB4 ON TB3.C1=TB4.C1
> ON TB1.C1=TB3.C1
> 
> is the same as
> (TB1 LEFT JOIN TB2 ON TB1.C1=TB2.C1)
> LEFT JOIN (TB3 LEFT JOIN TB4 ON TB3.C1=TB4.C1)
> ON TB1.C1=TB3.C1
> 
> Hmm - verrrry eeenterrresting!
> 
> Vern

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