Impostazione Oracle :
CREATE TABLE table_name ( S_NO, id, Pid ) AS
SELECT 1, 123, 'PAQ123' FROM DUAL UNION ALL
SELECT 2, 433, 'WSD3FF' FROM DUAL UNION ALL
SELECT 3, 565, 'PAS45E' FROM DUAL UNION ALL
SELECT 4, 123, 'PAQ123X' FROM DUAL UNION ALL
SELECT 5, 433, 'WSD3FFY' FROM DUAL UNION ALL
SELECT 6, 123, 'PAQ123Z' FROM DUAL;
Richiesta :
SELECT *
FROM (
SELECT t.*,
( SELECT COUNT(*)
FROM table_name x
WHERE t.id = x.id
AND LENGTH( t.Pid ) < LENGTH( x.pid )
AND INSTR( x.Pid, t.Pid ) = 1 ) AS num_matches
FROM Table_name t
)
WHERE num_matches > 0;
Risultato :
S_NO ID PID NUM_MATCHES
---------- ---------- ------- -----------
1 123 PAQ123 2
2 433 WSD3FF 1
Se vuoi ottenere le corrispondenze, puoi utilizzare una raccolta:
CREATE TYPE stringlist AS TABLE OF VARCHAR2(100);
/
Richiesta :
SELECT *
FROM (
SELECT t.*,
CAST(
MULTISET(
SELECT PID
FROM table_name x
WHERE t.id = x.id
AND LENGTH( t.Pid ) < LENGTH( x.pid )
AND INSTR( x.Pid, t.Pid ) = 1
)
AS stringlist
) AS matches
FROM Table_name t
)
WHERE matches IS NOT EMPTY;
o (poiché non sono sicuro di MULTISET è in 10 g):
SELECT *
FROM (
SELECT t.*,
CAST(
(
SELECT COLLECT( PID )
FROM table_name x
WHERE t.id = x.id
AND LENGTH( t.Pid ) < LENGTH( x.pid )
AND INSTR( x.Pid, t.Pid ) = 1
)
AS stringlist
) AS matches
FROM Table_name t
)
WHERE matches IS NOT EMPTY;
Risultato
S_NO ID PID MATCHES
---------- ---------- ------- ------------------------------------
1 123 PAQ123 TEST.STRINGLIST('PAQ123X','PAQ123Z')
2 433 WSD3FF TEST.STRINGLIST('WSD3FFY')
