Parsing a column

Question

I am using 11g
I have the following data_set.
Table consits of seq_no, order_key, model and sr_no. For Each order_key, there can be multiple seq_no, model and sr_no.
with data_Set as (
SELECT 105 SEQ_NO,    1240077 ORDER_KEY,    7018572 MODEL,    'ABCD|EFGH'  SR_NO FROM DUAL UNION ALL
SELECT 105,    1240077,    7018572,    'ABCD|EFGH' FROM DUAL UNION ALL
SELECT 107,    1240077,    7018574,    'XXXX|YYYY' FROM DUAL UNION ALL
SELECT 107,    1240077,    7018574,    'XXXX|YYYY' FROM DUAL UNION ALL
SELECT 999,    1240165,    7018569,    'AAA|BBB|CCC' FROM DUAL UNION ALL
SELECT 999,    1240165,    7018569,    'AAA|BBB|CCC' FROM DUAL UNION ALL
SELECT 999,    1240165,    7018569,    'AAA|BBB|CCC' FROM DUAL
) SELECT * FROM DATA_SET
In the above data set,
for order_key 1240077, model_no = 7018572,  SR_NO is 'ABCD|EFGH', on the result set, it need to be split into two 'ABCD' for line 1 and 'EFGH' for line 2
similarly, for order_key 1240077, model_no = 7018574, SR_NO = 'XXXX|YYYY' ,on the result set, it need to be split into two 'XXXX' for line 1 and 'YYYY' for line 2
and for order_key 1240165, SR_NO = 'AAA|BBB|CCC', on the result set, it need to be split into three, 'AAA' on line 1, 'BBB' on line 2 and 'CCC' on line 3
with RESULT_SET as (
SELECT 105 SEQ_NO,    1240077 ORDER_KEY,    7018572 MODEL,    'ABCD'  SR_NO FROM DUAL UNION ALL
SELECT 105,    1240077,    7018572,    'EFGH' FROM DUAL UNION ALL
SELECT 107,    1240077,    7018574,    'XXXX' FROM DUAL UNION ALL
SELECT 107,    1240077,    7018574,    'YYYY' FROM DUAL UNION ALL
SELECT 999,    1240165,    7018569,    'AAA' FROM DUAL UNION ALL
SELECT 999,    1240165,    7018569,    'BBB' FROM DUAL UNION ALL
SELECT 999,    1240165,    7018569,    'CCC' FROM DUAL
) SELECT * FROM RESULT_SET
I am trying this , but can't figure out.
SELECT seq_no, order_key, model,
            REGEXP_SUBSTR (NVL ( sr_no, LAG (sr_no)OVER ( PARTITION BY order_key ORDER BY 1)), '[^|]+' ) AS new_sr_no
FROM data_set a ORDER BY seq_no

Answer 1

Hi,
It looks like you were on the right track.
Depnding on your data and your requirements:
SELECT  seq_no, order_key, model
,       REGEXP_SUBSTR ( sr_no
                      , '[^|]+'
                      , 1
                      , ROW_NUMBER () OVER ( PARTITION BY  seq_no
                                             ,             order_key
                                             ,             model
                                             ORDER BY      NULL
                      ) AS sr_no
FROM    data_set