mirror of
https://github.com/KevinMidboe/linguist.git
synced 2025-10-29 09:40:21 +00:00
43 lines
1.7 KiB
Prolog
43 lines
1.7 KiB
Prolog
/*
|
|
* Multi-line comment
|
|
*/
|
|
#option ('slidingJoins', true);
|
|
|
|
namesRecord :=
|
|
RECORD
|
|
string20 surname;
|
|
string10 forename;
|
|
integer2 age;
|
|
integer2 dadAge;
|
|
integer2 mumAge;
|
|
END;
|
|
|
|
namesRecord2 :=
|
|
record
|
|
string10 extra;
|
|
namesRecord;
|
|
end;
|
|
|
|
namesTable := dataset('x',namesRecord,FLAT);
|
|
namesTable2 := dataset('y',namesRecord2,FLAT);
|
|
|
|
integer2 aveAgeL(namesRecord l) := (l.dadAge+l.mumAge)/2;
|
|
integer2 aveAgeR(namesRecord2 r) := (r.dadAge+r.mumAge)/2;
|
|
|
|
// Standard join on a function of left and right
|
|
output(join(namesTable, namesTable2, aveAgeL(left) = aveAgeR(right)));
|
|
|
|
//Several simple examples of sliding join syntax
|
|
output(join(namesTable, namesTable2, left.age >= right.age - 10 and left.age <= right.age +10));
|
|
output(join(namesTable, namesTable2, left.age between right.age - 10 and right.age +10));
|
|
output(join(namesTable, namesTable2, left.age between right.age + 10 and right.age +30));
|
|
output(join(namesTable, namesTable2, left.age between (right.age + 20) - 10 and (right.age +20) + 10));
|
|
output(join(namesTable, namesTable2, aveAgeL(left) between aveAgeR(right)+10 and aveAgeR(right)+40));
|
|
|
|
//Same, but on strings. Also includes age to ensure sort is done by non-sliding before sliding.
|
|
output(join(namesTable, namesTable2, left.surname between right.surname[1..10]+'AAAAAAAAAA' and right.surname[1..10]+'ZZZZZZZZZZ' and left.age=right.age));
|
|
output(join(namesTable, namesTable2, left.surname between right.surname[1..10]+'AAAAAAAAAA' and right.surname[1..10]+'ZZZZZZZZZZ' and left.age=right.age,all));
|
|
|
|
//This should not generate a self join
|
|
output(join(namesTable, namesTable, left.age between right.age - 10 and right.age +10));
|