Extract Data from a column and Update another coulmn in same table in Oracle

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I have a table in Oracle 'tEvents', Containing column 'Action' which having string containg Two EventIDs as you can see in example. My requirement, is I need to Extrcat the Both EventIDs and update the colummn EventID1 and EventID2 respectively.The Table contains millions of record.

KEY | USERID | Action | EventID1 | EventID2 | Date

309629 | U099439 | Updated Action Item for Event 249 for Associated Event 9400 | NULL | NULL | 11-AUG-99

Posted 29-Jan-14 3:25am

Mohd Shamim Ansari

Updated 20-May-14 23:07pm

Nelek

v2

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Basmeh Awad 29-Jan-14 9:32am

the string in your action column always will be the same with diffrent EVENTID??????

Mohd Shamim Ansari 29-Jan-14 9:44am

String will be in different format with EventdID but in Some row it is not mandatory to be EventID and also some row contains 1 or 2 EventID.

For Example
Updated Action Item for Event 249 for Associated Event 9400
New Action Item for Event 249 has been Added
Action Item for Event 249 is deleted

Thanks for your Reply!

Peter Leow 29-Jan-14 9:55am

Please do not re-post.

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aravinth04 · Answer 1 · 2014-05-20T22:30:00

You can use the below query

SQL

Select CASE When INSTR (testres,'|')>0 THEN SUBSTR (testres,1,INSTR (testres,'|')-1) ELSE testres END EventID1,
CASE When INSTR (testres,'|')>0 THEN SUBSTR (testres,INSTR (testres,'|')+1,LENGTH(testres))ELSE NULL END as EventId2,
testres,test from (
select
CASE When INSTR (test,'New Action')>0 THEN REPLACE(REPLACE(test,'New Action Item for Event ',''),' has been Added','')
     When INSTR (test,'Updated Action')>0 THEN REPLACE(REPLACE(test,'Updated Action Item for Event ',''),' for Associated Event ','|')
     When INSTR (test,' is deleted')>0 THEN REPLACE(REPLACE(test,'Action Item for Event ',''),' is deleted','')
END testres,

test from(
select 'Updated Action Item for Event 249 for Associated Event 9400' test from dual union
select 'New Action Item for Event 249 has been Added' from dual union
select 'Action Item for Event 249 is deleted' from dual
)A )B