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Task/Hash-join/Clojure/hash-join.clj

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+(defn hash-join [table1 col1 table2 col2]
+  (let [hashed (group-by col1 table1)]
+    (flatten
+      (for [r table2]
+        (for [s (hashed (col2 r))]
+          (merge s r))))))
+
+(def s '({:age 27 :name "Jonah"}
+         {:age 18 :name "Alan"}
+         {:age 28 :name "Glory"}
+         {:age 18 :name "Popeye"}
+         {:age 28 :name "Alan"}))
+
+(def r '({:nemesis "Whales" :name "Jonah"}
+         {:nemesis "Spiders" :name "Jonah"}
+         {:nemesis "Ghosts" :name "Alan"}
+         {:nemesis "Zombies" :name "Alan"}
+         {:nemesis "Buffy" :name "Glory"}))
+
+(pprint (sort-by :name (hash-join s :name r :name)))