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CREATE TEMP TABLE IF NOT EXISTS chains ( cname TEXT PRIMARY KEY, becomes TEXT ); INSERT INTO chains VALUES ('A', NULL), ('B', 'C'), ('C', 'D'), ('D', 'E'), ('E', NULL) ;
5 rows affected
with recursive final_link as ( select cname, becomes, cname original_cname, 0 lvl from chains where becomes is not null union all select c.cname, c.becomes , f.original_cname, f.lvl + 1 from chains c inner join final_link f on f.becomes = c.cname where c.becomes is not null ) select distinct on (original_cname) original_cname, becomes from final_link order by original_cname, lvl desc
original_cname
becomes
B
E
C
E
D
E