How to return only 1 row of data

Question

Hi,
My problem if the table looks similar to the 1 below.
ID pay_cycle pymnt_dt
1 PAY 12/01/2006
1 EX 12/05/2006
2 PAY 12/08/2006
If the ID (such as ID 1) has a pay cycle of EX, I only want to get its payment date. I don't want it to return any other rows. However if the ID has no pay_cycle of EX (such as ID 2) I want it to return the pymnt_dt of PAY. Is this possible through SQL? I am planning to place the SQL on a table view.

Answer 1

Hi,
I tried to join the query to other tables but I am getting an invalid column name error
SELECT
C.OPRID ,
A.SHEET_ID ,
A.SHEET_NAME ,
B.NAME ,
A.EMPLID ,
A.SHEET_STATUS ,
A.CREATION_DT ,
A.APPROVAL_DT ,
z.PYMNT_DT
FROM
PS_EX_SHEET_HDR A ,
PS_PERSONAL_DATA B ,
PSOPRDEFN C ,
PS_EX_SHEET_APRVL D ,
( SELECT DISTINCT sheet_id,
pymnt_dt FROM ( SELECT sheet_id,
pay_cycle,
pymnt_dt,
seq_nbr,
line_nbr,
row_number() OVER (PARTITION BY sheet_id ORDER BY pay_cycle DESC) rn FROM ps_ex_sheet_pymnt )
WHERE
rn = 1) z WHERE A.SHEET_STATUS='PD' AND
A.POST_STATUS_EX IN ('P','N') AND
A.APPROVAL_LEVEL IN ('S','T','B','I') AND
D.SHEET_ID = A.SHEET_ID AND
D.APPROVER_TYPE = 'T' AND
D.APPROVAL_STATUS NOT IN ('A', 'D') AND
B.EMPLID = A.EMPLID AND
A.SHEET_ID = z.SHEET_ID AND
z.SEQ_NBR = ( SELECT MAX(SEQ_NBR) FROM PS_EX_SHEET_PYMNT X , PS_EX_SHEET_LINE T WHERE E.SHEET_ID = X.SHEET_ID AND
X.SHEET_ID = T.SHEET_ID AND
X.LINE_NBR = T.LINE_NBR) AND
z.EMPLID = A.EMPLID AND
A.EMPLID NOT IN ( SELECT X.EMPLID FROM PSOPRDEFN X WHERE X.OPRID = C.OPRID) ;