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Leetcode 571 Find Median Given Frequency of Numbers & 614 Second Degree Follower
--PostgreSQL 9.6 --'\\' is a delimiter drop table if exists Numbers; Create table Numbers ("Number" int, "Frequency" int); insert into Numbers ("Number", "Frequency") values (0, 7), (1, 1), (2, 3), (3, 1); drop table if Exists follow; create table follow ("followee" varchar(255), "follower" varchar(255)); insert into follow ("followee", "follower") values ('A', 'B'), ('B', 'C'), ('B', 'D'), ('D', 'E');
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Return IDs where there are exactly 3 occurrences