Sql query for following scenario - sql

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')
)
)

Answer 2

I think you could join the Property table three times -- maybe something like this (untested):
SELECT I.ID_ICCID
FROM ICCID I
JOIN ICCID_Property IP ON I.ID_ICCID = IP.ID_ICCID AND IP.C_Key = 'STATE' AND IP.C_Value = 'Active'
JOIN ICCID_Property IP2 ON I.ID_ICCID = IP.ID_ICCID AND IP2.C_Key = 'STATE' AND IP2.C_Value= 'Removed'
JOIN ICCID_Property IP3 ON I.ID_ICCID = IP.ID_ICCID AND IP3.C_Key = 'date.to.change' AND to_date(IP3.C_Value,'yyyymmdd') >= to_date('2012-DEC-01 00:00:00', 'YYYY-MON-DD HH24:MI:SS')
AND to_date(IP3.C_Value,'yyyymmdd') <=
to_date('2012-DEC-31 23:59:59', 'YYYY-MON-DD HH24:MI:SS')
Good luck.