24 lines
896 B
Lua
24 lines
896 B
Lua
local function recA(age, name) return { Age=age, Name=name } end
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local tabA = { recA(27,"Jonah"), recA(18,"Alan"), recA(28,"Glory"), recA(18,"Popeye"), recA(28,"Alan") }
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local function recB(character, nemesis) return { Character=character, Nemesis=nemesis } end
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local tabB = { recB("Jonah","Whales"), recB("Jonah","Spiders"), recB("Alan","Ghosts"), recB("Alan","Zombies"), recB("Glory","Buffy") }
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local function hashjoin(taba, cola, tabb, colb)
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local hash, join = {}, {}
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for _,rowa in pairs(taba) do
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if (not hash[rowa[cola]]) then hash[rowa[cola]] = {} end
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table.insert(hash[rowa[cola]], rowa)
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end
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for _,rowb in pairs(tabb) do
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for _,rowa in pairs(hash[rowb[colb]]) do
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join[#join+1] = { A=rowa, B=rowb }
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end
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end
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return join
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end
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for _,row in pairs(hashjoin(tabA, "Name", tabB, "Character")) do
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print(row.A.Age, row.A.Name, row.B.Character, row.B.Nemesis)
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end
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