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Developer-C 11.1
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WITH TABLE1(ID,NUM) AS ( SELECT 1 AS ID,0 AS NUM UNION ALL SELECT 2 AS ID,1 AS NUM UNION ALL SELECT 3 AS ID,1 AS NUM ), TABLE2(ID,DT_OPEN,C_CODE)AS ( SELECT 1,'20070201','432-654' UNION ALL SELECT 1,'20171211','676-865' UNION ALL SELECT 1,'20181005','454-456' UNION ALL SELECT 2,'20070201','234-566' UNION ALL SELECT 2,'20180510','852-543' UNION ALL SELECT 3,'20171211','686-876' UNION ALL SELECT 3,'20180510','759-252' ) select distinct table1.id, table1.num, case when table1.num = 1 then first_value(table2.c_code) over (partition by table2.id order by table2.dt_open) end c_code from table1,table2 where table1.id = table2.id order by 1
id
num
c_code
1
0
null
2
1
234-566
3
1
686-876