compound_three_primary_keys

1 row where pk2 = "t" and pk3 = "p"

descending

Link	pk1	pk2	pk3	content
a,t,p	a	t	p	a-t-p

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CREATE TABLE compound_three_primary_keys (
  pk1 varchar(30),
  pk2 varchar(30),
  pk3 varchar(30),
  content text,
  PRIMARY KEY (pk1, pk2, pk3)
);
CREATE INDEX idx_compound_three_primary_keys_content ON compound_three_primary_keys(content);