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TDDB77 Databasteknik Fö 4 Olika typer av JOINS Henrik André-Jönsson.

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Presentation on theme: "TDDB77 Databasteknik Fö 4 Olika typer av JOINS Henrik André-Jönsson."— Presentation transcript:

1 TDDB77 Databasteknik Fö 4 Olika typer av JOINS Henrik André-Jönsson

2 JOIN Kartesiskprodukt (Inner) Join Outer Join

3 Kartesiskprodukt AA’ BB’ A’D’ B’E’ C’F’CX’

4 Kartesiskprodukt AA’ BB’ A’D’ B’E’AA’ BB’ C’F’AA’ BB’ A’D’ B’E’ C’F’ CX’ C C A’D’ B’E’ C’F’

5 Inner Join AA’ BB’ A’D’ B’E’ C’F’CX’ Join-villkor: Attribut 2 i relation 1 ska vara lika med attribut1 i relation 2.

6 Inner Join AA’ D’ BB’ E’

7 Full Outer Join AA’ BB’ A’D’ B’E’ C’F’CX’ Join-villkor: Attribut 2 i relation 1 ska vara lika med attribut1 i relation 2.

8 Full Outer Join AA’ D’ BB’ E’ CX’ null C’F’ null

9 Right Outer Join AA’ BB’ A’D’ B’E’ C’F’CX’ Join-villkor: Attribut 2 i relation 1 ska vara lika med attribut1 i relation 2.

10 Right Outer Join AA’ D’ BB’ E’ C’F’ null

11 Left Outer Join AA’ BB’ A’D’ B’E’ C’F’CX’ Join-villkor: Attribut 2 i relation 1 ska vara lika med attribut1 i relation 2.

12 Left Outer Join AA’ D’ BB’ E’ CX’ null


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