Search for a record at a later date

Hello

From this forum, I am able to solve little of my question but not always able to reach the conclusion.

My requirement is to search the later date in the clob data type and then return records. Dates are available in the format YYYY DD Mon.

In the example below, I just want these IDS when the variable 'text' contain later date that is available in the text date > current date

Output must be ID 101, 102 because it contain date > current date

ID 103 will not come as long as the date (November 19, 2014) < date current (November 20, 2014)

with abc as

(

Select 101 as id, ' Prime Minister arrived in Melbourne for the last leg of his tour of four cities in Australia on March 1, 2014 and April 3, 2100 as the double data

Union

Select 102, "The 234/12 advance r1eading of Singapore December 1, 2012, for the third quarter on December 1, 2015, showing no response" of the double

Union

Select 103, ' there is no malaria symptom Minister after November 19, 2014 meaning vaccine properly work ' from dual

)

Select regexp_substr (data,'[(0123456789)] + [()] + ((Jan) |)) () Feb) | (Mar) | (APR) | (May). (Jun) | (Jul) | (August). (MS) | (Oct) | (Nov). (Dec)) [()] + [(0123456789)] +')

ABC

Suggestion:

FUNCTION to CREATE or REPLACE makeDate (in_string in VARCHAR2
in_format IN VARCHAR2: = "DD month YYYY")
date of return
IS
BEGIN
To_date (in_string, in_format) return;
exception
When others then return null;
end;

/

WITH abc AS (SELECT 101 AS ID, 'Prime Minister arrived in Melbourne for the last leg of his tour of four cities in the Australia on March 1, 2014-3 April 2100' AS DATA FROM dual
UNION
SELECT 102, "The 234/12 advance r1eading of Singapore December 1, 2012, for the third quarter on December 1, 2015, showing no response" OF THE double
UNION
SELECT 103, ' there is no malaria symptom Minister after November 19, 2014 meaning vaccine properly work ' FROM DUAL
UNION
SELECT 104, ' there is no malaria symptom Minister after 19 Qur'an 2014 sense vaccine working properly ' FROM DUAL
)
, date (select id, regexp_substr (data, "([0-9] {1,2} [A-Z] {3} [0-9] {4})', 1, level, 'i'") datestring)
ABC
CONNECT PRIOR ID = ID
AND PRIOR sys_guid() IS NOT NULL
AND LEVEL<= regexp_count(data,'([0-9]{1,2}="" [a-z]{3}="">
SELECT a.ID, a.data
DATE d
INNER JOIN abc A ON (A.ID = d.ID)
where makeDate (d.datestring) > sysdate

/

Instead of having a WHEN and others-the function you * should * catch possible exceptions.

I chose to build a to_date function to be able to continue in the case of a bad date.

HTH

Tags: Database

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