Oracle Database
Oracle Database

query to parse string

I have a table with two columns..

I am just displaying one record for brevity

COL_STR KEY
COL_A, COL_B, COL_C, COL_D COL_A

I need a query to process the above two values and return the following

return_val

TGT.COL_B = SRC.COLB
TGT.COL_C = SRC.COL_C
TGT.COL_D = SRC.COL_D

i would like the value in the key column to be excluded (in the above example COL_A)

if key has following
COL_A, COL_B

the output should be:

TGT.COL_C = SRC.COL_C
TGT.COL_D = SRC.COL_D

Please let me know if this is possible..

Thanks,

gs79Asked: 2014-01-10

Who is Participating?

Experts Exchange Solution brought to you by

Enjoy your complimentary solution view.

Get this solution by purchasing an Individual license! Start your 7-day free trial.

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

LVL 75

sdstuberCommented: 2014-01-10

what version of the db? Full 4-digit version please like 11.2.0.1 not 11g

gs79Author Commented: 2014-01-10

Thanks

Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production

LVL 75

sdstuberCommented: 2014-01-10

This should work in 10.2.0.1 and above
I made the assumption that you would have 10 columns or less. If that's not true, simply bump up the LEVEL <= 10 to something large enough to accomodate your data

SELECT 'TGT.' || str || ' = ' || 'SRC.' || str
FROM (SELECT REGEXP_SUBSTR(
col_str,
'[^ ,]+',
1,
n
)
str
FROM yourtable,
( SELECT LEVEL n
FROM DUAL
CONNECT BY LEVEL <= 10)
WHERE REGEXP_SUBSTR(
col_str,
'[^ ,]+',
1,
n
)
IS NOT NULL
MINUS
SELECT REGEXP_SUBSTR(
key,
'[^ ,]+',
1,
n
)
FROM yourtable,
( SELECT LEVEL n
FROM DUAL
CONNECT BY LEVEL <= 10)
WHERE REGEXP_SUBSTR(
key,
'[^ ,]+',
1,
n
)
IS NOT NULL)

LVL 75

sdstuberCommented: 2014-01-10

Assuming there is an id column or some other values in your table that you want to keep track of with each row simply add it to the selects...

For example, using an ID column...

SELECT id, 'TGT.' || str || ' = ' || 'SRC.' || str
FROM (SELECT id,
REGEXP_SUBSTR(
col_str,
'[^ ,]+',
1,
n
)
str
FROM yourtable,
( SELECT LEVEL n
FROM DUAL
CONNECT BY LEVEL <= 10)
WHERE REGEXP_SUBSTR(
col_str,
'[^ ,]+',
1,
n
)
IS NOT NULL
MINUS
SELECT id,
REGEXP_SUBSTR(
key,
'[^ ,]+',
1,
n
)
FROM yourtable,
( SELECT LEVEL n
FROM DUAL
CONNECT BY LEVEL <= 10)
WHERE REGEXP_SUBSTR(
key,
'[^ ,]+',
1,
n
)
IS NOT NULL)

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial

LVL 16

Alex [***Alex140181***]Software DeveloperCommented: 2014-01-10

You're always doing a great job here at EE, sdstuber. But I think it would be nice, if you might explain your (awesome) SQL statements a bit more to the asker (so they may learn better to use and adept).
Just a thought ;-) Keep going!

Kind regards,
Alex

gs79Author Commented: 2014-01-10

Thanks sdstuber..It works..but I need to do this procedurally in a dynamic sql and generate a merge statement..i will close this and open and another question with more details

Thanks

gs79Author Commented: 2014-01-10

Sdstuber..Is there a way to get result it as one value rather than multiple records

I just want the result as a value not the records, the above example gives me 3 records instead of record with:
TGT.COL_B = SRC.COLB
TGT.COL_C = SRC.COL_C
TGT.COL_D = SRC.COL_D

Thanks