SQL Query doubt

Question

Hi,
I have a Customer info table Table1
it has the following fields apart from many other fields like cust account info.
Account_number
Tax_id
Tax_ID_format (this field has values S, T and the column is NUllable.
I need to find all the tax ids that have both format codes S and T. This is not common as every tax_id is either S or T. But there can be an instance when both of them can be same that is the SSN and TIN number being same as both do not originate from the same system.
The query i used is:
SELECT A.ACCT_NUM, A.TAX_ID, A.TX_FMT_CD
FROM
ACCOUNT A
WHERE A.TAX_ID IN
SELECT B.TAX_ID FROM
ACCOUNT B
WHERE B.TAX_FMT_CD = 'S'
AND A.TX_FMT_CD = 'T'
ORDER BY A.TAX_ID
The results are all messed up. Any help can be appreciated. Thank you.

Answer 1

Hi,
Jut another way.
Assuming you dont have Y,X and Z as your tax_is_format.
WITH DATA AS(
SELECT 1 acct_no,'A' tax_id,'S'  tax_id_format FROM dual UNION ALL
SELECT 2 acct_no,'B' tax_id,'S'  tax_id_format FROM dual UNION ALL
SELECT 3 acct_no,'C' tax_id,'S'  tax_id_format FROM dual UNION ALL
SELECT 4 acct_no,'D' tax_id,'S'  tax_id_format FROM dual UNION ALL
SELECT 5 acct_no,'E' tax_id,'S'  tax_id_format FROM dual UNION ALL
SELECT 1 acct_no,'A' tax_id,'T'  tax_id_format FROM dual UNION ALL
SELECT 2 acct_no,'B' tax_id,'T'  tax_id_format FROM dual UNION ALL
SELECT 1 acct_no,'A' tax_id,'S'  tax_id_format FROM dual UNION ALL
SELECT 1 acct_no,'C' tax_id,'S'  tax_id_format FROM dual UNION ALL
SELECT 1 acct_no,'C' tax_id,'T'  tax_id_format FROM dual UNION ALL
SELECT 1 acct_no,'C' tax_id,NULL  tax_id_format FROM dual UNION ALL
SELECT 1 acct_no,'C' tax_id,NULL  tax_id_format FROM dual
SELECT DISTINCT tax_id FROM(
SELECT acct_no,tax_id,tax_id_format,
COUNT(DISTINCT nvl(decode(tax_id_format,'S','Y','T','X','Z'),'Z')) over (PARTITION BY tax_id) cnt
FROM DATA
WHERE tax_id_format IS NOT NULL
WHERE cnt=2
Cheers!!!
Bhushan