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CREATE TEMP TABLE IF NOT EXISTS chains ( cname TEXT PRIMARY KEY, becomes TEXT REFERENCES chains(cname) ); INSERT INTO chains VALUES ('A', NULL), ('B', 'C'), ('C', 'D'), ('D', 'E'), ('E', NULL) ;
CREATE TABLE
INSERT 0 5
WITH RECURSIVE final_link AS ( SELECT cname, becomes FROM chains c WHERE (SELECT becomes IS NULL FROM chains WHERE cname = c.becomes) UNION SELECT c.cname, fl.becomes FROM chains c INNER JOIN final_link fl ON c.becomes = fl.cname ) SELECT * FROM final_link UNION SELECT cname, cname FROM chains WHERE becomes IS NULL; -- optional :-)
cname
becomes
A
A
B
E
C
E
D
E
E
E
SELECT 5