I have a single table of hostnames and NFS exports, some but not all of which are related.
Example entries:
HOST VOLUME ----- ---------- host1 vol1 host1 vol2 host1 vol3 host2 bkvol1_DR host2 bkvol2_DR host2 bkvol3_DR
I'm trying to create a query which will give me the following:
SRCHOST DSTHOST SRCVOL DSTVOL ------- ------- ------ ------ host1 host2 vol1 bkvol1_DR host1 host2 vol2 bkvol2_DR host1 host2 vol3 bkvol3_DR
I've tried various incantations of substring(), trim(), and join clauses, and I'm getting nowhere. This is on PostgreSQL 9.2. In non-functional code, this is what I want:
select a.host, b.host, a.volume, b.volume from table as a, table as b where a.volume is a substring of b.volume
Best Answer
Instead of
LIKE
you can also useposition
which might be easier to read:SQLFiddle: http://sqlfiddle.com/#!15/a67c5/1