Abinitio Question #13 | Rank() function implementation in Abinitio



Watch my YouTube video for explanation :




Please look into the class notes here for your references:


SELECT deptno,
       ename,
       sal,
       RANK() OVER (PARTITION BY deptno ORDER BY sal) "rank"
FROM   emp
WHERE  deptno = 30;

    DEPTNO ENAME             SAL       rank
---------- ---------- ---------- ----------
        30 JAMES             950          1
        30 WARD             1250          2
        30 MARTIN           1250          2
        30 TURNER           1500          4
        30 ALLEN            1600          5
        30 BLAKE            2850          6
20 
20 
Can you achive it in Abinitio?

Input -> SORT (Key = DEPTNO,SAL ASC) ->SCAN -> Output

InputDML-
record
string(",") DEPTNO;
string(",") ENAME;
decimal(",") SAL;
decimal("\n") RANK;
end;


type temporary_type=
begin
decimal(",") prv_amt;
decimal(",") ranking;
decimal(",") ranking_tracking;
end;

temp::initialize(in)=
begin
temp.ranking::1;
temp.prv_amt::in.SAL;
temp.ranking_tracking::0;
end;

out::scan(temp,in)=
begin
out.ranking::if(in.SAL>temp.prv_amt) temp.ranking_tracking +1 else temp.ranking;
out.prv_amt::in.SAL;
out.ranking_tracking:: temp.ranking_tracking +1;
end;

out::finalize(temp,in)=
begin
out.*::in.*;
out.RANK::temp.ranking;
end;

OutputDML-
record
string(",") DEPTNO;
string(",") ENAME;
decimal(",") SAL;
decimal("\n") RANK;
end;


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