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Developer-C 11.1
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CREATE TABLE mytable( source VARCHAR(2) NOT NULL PRIMARY KEY ,delivery VARCHAR(2) NOT NULL ); INSERT INTO mytable(source,delivery) VALUES ('s1','d1'); INSERT INTO mytable(source,delivery) VALUES ('d1','d2'); INSERT INTO mytable(source,delivery) VALUES ('d2','f1'); INSERT INTO mytable(source,delivery) VALUES ('s2','d3'); INSERT INTO mytable(source,delivery) VALUES ('d3','d4'); INSERT INTO mytable(source,delivery) VALUES ('d4','d5'); INSERT INTO mytable(source,delivery) VALUES ('d5','f2');
with recursive cte as ( select source, delivery, 1 hops from mytable t where not exists (select 1 from mytable t1 where t1.delivery = t.source) union all select c.source, t.delivery, c.hops + 1 from cte c inner join mytable t on t.source = c.delivery ) select source, delivery, hops from cte c where hops = (select max(c1.hops) from cte c1 where c1.source = c.source)
source
delivery
hops
s1
f1
3
s2
f2
4