The Inner Join and Outer Joins Dec 15 2004. B,D,F A G C Dancing and Tennis Dancing only Tennis Only The Whole Picture.

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Presentation transcript:

The Inner Join and Outer Joins Dec

B,D,F A G C Dancing and Tennis Dancing only Tennis Only The Whole Picture

B,D,F The Inner Join Inner

B,D,F A G The Left Outer Join LeftInner

B,D,FC The Right Outer Join Right Inner

B,D,F A G C The Full Outer Join Left Right Inner

A G C The Exclusive Join Left Right

Using Plausible Keys To link The tables together …. dance ____ JOIN tennis ON dance.scode=tennis.scode

B,D,F The Inner Join Inner SELECT * FROM dance inner join tennis On dance.scode=tennis.scode

B,D,F A G The Left Outer Join LeftInner SELECT * FROM dance left outer join tennis On dance.scode=tennis.scode

B,D,FC The Right Outer Join RightInner SELECT * FROM dance right outer join tennis On dance.scode=tennis.scode

B,D,F A G C The Full Outer Join LeftRightInner SELECT * FROM dance full outer join tennis On dance.scode=tennis.scode

A G C The Exclusive Join LeftRight SELECT * FROM dance full outer join tennis On dance.scode=tennis.scode Where dance.scode is.null. Or tennis.scode is.null.

Court1 Court2 3:30 – 4:00 Session A 4:00 – 4:30 Session B

Keys for Sessions: udate+session

Using Plausible Keys To link The tables together Keys for Sessions: udate+session court1____ JOIN court2 ON court1.udate=court2.udate and court1.session=court2.session …..

Using Plausible Keys To link The tables together Keys for Days:udate Group By court1____ JOIN court2 ON court1.udate=court2.udate session …..