PPT Slide

Example: Illustra Black Box ADT (cont.)

• Now we can put an end to "Pointless" queries...!

create function further_west(Point, Point) returns Boolean as

external name 'MI_HOME/functions/pointfuns.so'

language C;

select E1.name, E1.location

from Emp E1, Emp E2

where further_west(E1.location, E2.location) and E2.name = 'Mike';

create binary operator binding to further_west;

select E1.name, E1.location

from Emp E1, Emp E2

where E1.location >> E2.location and E2.name = 'Mike';

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