RosettaCodeData/Task/Hash-join/Jq/hash-join-2.jq

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def table1:
[ {"age": 27, "name": "Jonah"},
{"age": 18, "name": "Alan"},
{"age": 28, "name": "Glory"},
{"age": 18, "name": "Popeye"},
{"age": 28, "name": "Alan"} ]
;
def table2:
[ {"name": "Jonah", "nemesis": "Whales"},
{"name": "Jonah", "nemesis": "Spiders"},
{"name": "Alan", "nemesis": "Ghosts"},
{"name": "Alan", "nemesis": "Zombies"},
{"name": "Glory", "nemesis": "Buffy"} ]
;
def table1a:
[[27, "Jonah"],
[18, "Alan"],
[28, "Glory"],
[18, "Popeye"],
[28, "Alan"] ]
;
def table2a:
[["Jonah", "Whales"],
["Jonah", "Spiders"],
["Alan", "Ghosts"],
["Alan", "Zombies"],
["Glory", "Buffy"],
["Holmes", "Moriarty"] ]
;
def pp:
reduce .[] as $row (""; . + "\n" + ($row|tostring));
( hashJoin(table1; "name"; table2; "name"),
hashJoin(table1a; 1; table2a; 0)
) | pp