SQL & PL/SQL :: Query To Get Data In Desired Format?

CREATE TABLE DATA1
(
ID NUMBER(6),
DAT_ID NUMBER(6),
RNK NUMBER(2)
);
Insert into DATA1
(ID, DAT_ID, RNK)

[code]....

now after having this data from "data1" table , we need to get the row from "data2" table.in "data2" table there are total 6 combination on basis of "POS,ORDER" [ there are only 2 "ORDER" i.e. 'F' and 'S' , where as POS value can be changed, BUT THE "POS,ORDER" COMBINATION WILL HAVE ONLY 6 UNIQUE COMBINATION. ] so, for "POS and DAT_ID" combination we need to get the lowest rank data first, if that is not present then get the other rank given in "DATA1" table and so on and if no rank is present then select the NULL row row data from "DATA2" table for ex: in DATA1 table for count(*)>1 and id=1, we have data as

--------------
IDDAT_IDRNK

11231
11242
11253
--------------

so, in "DATA2" table, first we will see for "POS and ORDR" combination which DAT_ID is present, i.e. in case od POS=11 and ordr=F, we will select

111231FD1

as it is having lowest rank in "DATA1" table and it is present in "DATA2" table,

for POS=12 and ordr=F, we will select

121242FD1

as we don't have "123 and 1" in "DATA2" table so we will select the next rank given in "DATA1" ( i.e. 124 and 2 ), similarly , for POs=31 and ordr=S, we will select, as this is the next available rank and DAT_ID present in "DATA2" table

1D131S1253

and if there is no rank present from "DATA1" table in "DATA2" table then we will select the NULL row, i.e. for POS=21 and ordr=F, we need to select :

1D121F

"there will be 6 row for each id"

the output we want is :
-----------------------------------------
IDNAMEPOSORDER DAT_IDRNK
1D111F1231
1D112F1242
1D121F
1D12321S1231
1D2322S1242

[code]....