Oracle table merge - JOIN help needed

Question

Can someone help me with this results we want:
F_FCN_DT F_FCN_NUM F F_APPLD_DT F_APPLD_AMT F_R C_TCN_NUM
2007-08-16 54 1 2008-02-08 4.06 131 40617700776019668
2007-08-16 54 1 2008-02-08 4.06 135 40623900776014856
2007-08-16 54 1 2007-11-02 1022.08 135 60630500002011374
2007-08-16 54 1 2008-02-08 1022.08 135 30632600004003338
Below listed are the two tables and data combinations, which need to be linked in this process.
SQL> desc test11
Name Null? Type
F_FCN_DT NOT NULL CHAR(10)
F_FCN_NUM NOT NULL NUMBER(5)
F_FCN_MED_CD NOT NULL CHAR(1)
F_APPLD_DT NOT NULL CHAR(10)
F_APPLD_AMT NOT NULL NUMBER(13,2)
F_RSN_CD NOT NULL CHAR(3)
SQL> select * from test11;
F_FCN_DT F_FCN_NUM F F_APPLD_DT F_APPLD_AMT F_R
2007-08-16 54 1 2008-02-08 4.06 131
2007-08-16 54 1 2008-02-08 4.06 135
2007-08-16 54 1 2007-11-02 1022.08 135
2007-08-16 54 1 2008-02-08 1022.08 135
SQL> desc test12
Name Null? Type
F_FCN_DT NOT NULL CHAR(10)
F_FCN_NUM NOT NULL NUMBER(9)
F_FCN_MED_CD NOT NULL CHAR(1)
F_APPLD_AMT NOT NULL NUMBER(23,6)
C_TCN_NUM NOT NULL CHAR(17)
SQL> select * from test12;
F_FCN_DT F_FCN_NUM F F_APPLD_AMT C_TCN_NUM
2007-08-16 54 1 4.06 40617700776019668
2007-08-16 54 1 4.06 40623900776014856
2007-08-16 54 1 1022.08 60630500002011374
2007-08-16 54 1 1022.08 30632600004003338

Answer 1

Hi,
If you don't care which row from test11 gets paired with which row from test12 (as long as they're in the same group), then use the analytic ROW_NUMBER function to assign arbitrary ids to each row within each group, and add that id to the join condition, like this:
WITH    test11_plus  AS
     SELECT  f_fcn_dt, f_fcn_num, f, f_appld_dt, f_appld_amt, f_r               -- or whatever you need
     ,     ROW_NUMBER () OVER ( PARTITION BY  f_fcn_dt, f_fcn_num, f, f_appld_amt     -- common columns only
                               ORDER BY      NULL
                       )                    AS r_num
     FROM    test11
,     test12_plus  AS
     SELECT  f_fcn_dt, f_fcn_num, f, f_appld_amt, c_tcn_num                    -- or whatever you need
     ,     ROW_NUMBER () OVER ( PARTITION BY  f_fcn_dt, f_fcn_num, f, f_appld_amt     -- common columns only
                               ORDER BY      NULL
                       )                    AS r_num
     FROM    test11
SELECT     p11.*               -- Or list everything except r_num
,     p12.c_tcn_num
FROM     test11_plus     p11
JOIN     test12_plus     p12     ON     p11.f_fcn_dt     = p12.f_fcn_dt
                    AND     p11.f_fcn_num     = p12.f_fcn_num
                    AND     p11.f          = p12.f
                    AND     p11.f_appld_amt     = p12.f_appld_amt
                    AND     p11.r_num     = p12.r_num
;If the number of rows in the two tables may be different, then you may need an outer join.