Question

I have following scenario, for which i need to write sql query.

I have ICCID table and ICCID property table which holds following information.

I want to find out all active iccids and iccid’s which are in removed state in month of december 2012.for ICCIDs which are in removed state, date.to.change key in the ICCID property table itself which record the removed date of ICCID.

this is my attempt, but that did not worked
     select e.ID_ICCID from ICCID_PROPERTY e where 
     e.c_key ='STATE' and e.c_value='Active' or(
     e.c_key ='STATE' and 
     e.c_value='Removed' and
     e.c_key='date.to.change' and  
     to_date(e.c_value,'yyyymmdd')  >=to_date('2012-DEC-01 00:00:00', 'YYYY-MON-DD HH24:MI:SS') and 
     to_date(e.c_value,'yyyymmdd')  <= to_date('2012-DEC-31 23:59:59', 'YYYY-MON-DD HH24:MI:SS')
     ))

Thanks in advance for any help

Answer 1

This is one of the issues with a key-value pair design such as this…

You can’t just check a single property row to see if it matches the search criteria, since the criteria in this case will span multiple properties… you have to check if a single parent row has all the children properties that match:

SELECT
    i.ICCID
FROM
    ICCID i
WHERE
    EXISTS (
        SELECT 1
        FROM ICCID_PROPERTY ip
        WHERE 
            ip.ID_ICCID = i.ID_ICCID
            AND ip.c_key = 'STATE'
            AND ip.c_value = 'Active'
    ) OR (
        EXISTS (
            SELECT 1
            FROM ICCID_PROPERTY ip
            WHERE 
                ip.ID_ICCID = i.ID_ICCID
                AND ip.c_key = 'STATE'
                AND ip.c_value = 'Removed'
        ) AND
        EXISTS (
            SELECT 1
            FROM ICCID_PROPERTY ip
            WHERE 
                ip.ID_ICCID = i.ID_ICCID
                AND ip.c_key = 'date.to.change'
                AND to_date(ip.c_value,'yyyymmdd') >= 
                    to_date('2012-DEC-01 00:00:00', 'YYYY-MON-DD HH24:MI:SS') 
                AND to_date(ip.c_value,'yyyymmdd') <= 
                    to_date('2012-DEC-31 23:59:59', 'YYYY-MON-DD HH24:MI:SS')
        )
    )