What is ranked list ?

Question

Hi SAP-ABAP Experts .
(a.) What is ranked list ? How it is different from simple list disply or ALV display .
May some body give any small example of ranked list ?
(b.) Difference b/t Report Painter and Sql Query ?
Regards : Rajneesh

Answer 1

hi ,
Ranked lists
You can use the APPEND statement to create ranked lists in standard tables. To do this, create an empty table, and then use the statement:
APPEND <wa> TO <itab> SORTED BY <f>.
The new line is not added to the end of the internal table <itab>. Instead, the table is sorted by field <f> in descending order. The work area <wa> must be compatible with the line type of the internal table. You cannot use the SORTED BY addition with sorted tables.
When you use this technique, the internal table may only contain as many entries as you specified in the INITIAL SIZE parameter of the table declaration. This is an exception to the general rule, where internal tables can be extended dynamically. If you add more lines than specified, the last line is discarded. This is useful for creating ranked lists of limited length (for example "Top Ten"). You can use the APPEND statement to generate ranked lists containing up to 100 entries. When dealing with larger lists, it is advisable to sort tables normally for performance reasons.
Examples
DATA: BEGIN OF WA,
        COL1 TYPE C,
        COL2 TYPE I,
      END OF WA.
DATA ITAB LIKE TABLE OF WA.
DO 3 TIMES.
  APPEND INITIAL LINE TO ITAB.
  WA-COL1 = SY-INDEX. WA-COL2 = SY-INDEX ** 2.
  APPEND WA TO ITAB.
ENDDO.
LOOP AT ITAB INTO WA.
  WRITE: / WA-COL1, WA-COL2.
ENDLOOP.
The output is:
          0
1         1
          0
2         4
          0
3         9
This example creates an internal table ITAB with two columns that is filled in the DO loop. Each time the processing passes through the loop, an initialized line is appended and then the table work area is filled with the loop index and the square root of the loop index and appended.
DATA: BEGIN OF LINE1,
        COL1(3) TYPE C,
        COL2(2) TYPE N,
        COL3    TYPE I,
      END OF LINE1,
      TAB1 LIKE TABLE OF LINE1.
DATA: BEGIN OF LINE2,
        FIELD1(1)  TYPE C,
        FIELD2     LIKE TAB1,
      END OF LINE2,
      TAB2 LIKE TABLE OF LINE2.
LINE1-COL1 = 'abc'. LINE1-COL2 = '12'. LINE1-COL3 = 3.
APPEND LINE1 TO TAB1.
LINE1-COL1 = 'def'. LINE1-COL2 = '34'. LINE1-COL3 = 5.
APPEND LINE1 TO TAB1.
LINE2-FIELD1 = 'A'. LINE2-FIELD2 = TAB1.
APPEND LINE2 TO TAB2.
REFRESH TAB1.
LINE1-COL1 = 'ghi'. LINE1-COL2 = '56'. LINE1-COL3 = 7.
APPEND LINE1 TO TAB1.
LINE1-COL1 = 'jkl'. LINE1-COL2 = '78'. LINE1-COL3 = 9.
APPEND LINE1 TO TAB1.
LINE2-FIELD1 = 'B'. LINE2-FIELD2 = TAB1.
APPEND LINE2 TO TAB2.
LOOP AT TAB2 INTO LINE2.
  WRITE: / LINE2-FIELD1.
  LOOP AT LINE2-FIELD2 INTO LINE1.
    WRITE: / LINE1-COL1, LINE1-COL2, LINE1-COL3.
  ENDLOOP.
ENDLOOP.
The output is:
A
abc 12          3
def 34          5
B
ghi 56          7
jkl 78          9
The example creates two internal tables TAB1 and TAB2. TAB2 has a deep structure because the second component of LINE2 has the data type of internal table TAB1. LINE1 is filled and appended to TAB1. Then, LINE2 is filled and appended to TAB2. After clearing TAB1 with the REFRESH statement, the same procedure is repeated.
DATA: BEGIN OF LINE,
        COL1 TYPE C,
        COL2 TYPE I,
      END OF LINE.
DATA: ITAB LIKE TABLE OF LINE,
      JTAB LIKE ITAB.
DO 3 TIMES.
  LINE-COL1 = SY-INDEX. LINE-COL2 = SY-INDEX ** 2.
  APPEND LINE TO ITAB.
  LINE-COL1 = SY-INDEX. LINE-COL2 = SY-INDEX ** 3.
  APPEND LINE TO JTAB.
ENDDO.
APPEND LINES OF JTAB FROM 2 TO 3 TO ITAB.
LOOP AT ITAB INTO LINE.
  WRITE: / LINE-COL1, LINE-COL2.
ENDLOOP.
The output is:
1         1
2         4
3         9
2         8
3        27
This example creates two internal tables of the same type, ITAB and JTAB. In the DO loop, ITAB is filled with a list of square numbers, and JTAB with a list of cube numbers. Then, the last two lines of JTAB are appended to ITAB.
DATA: BEGIN OF LINE,
        COL1 TYPE I,
        COL2 TYPE I,
        COL3 TYPE I,
       END OF LINE.
DATA ITAB LIKE TABLE OF LINE INITIAL SIZE 2.
LINE-COL1 = 1. LINE-COL2 = 2. LINE-COL3 = 3.
APPEND LINE TO ITAB SORTED BY COL2.
LINE-COL1 = 4. LINE-COL2 = 5. LINE-COL3 = 6.
APPEND LINE TO ITAB SORTED BY COL2.
LINE-COL1 = 7. LINE-COL2 = 8. LINE-COL3 = 9.
APPEND LINE TO ITAB SORTED BY COL2.
LOOP AT ITAB INTO LINE.
  WRITE: / LINE-COL2.
ENDLOOP.
The output is:
         8
         5
The program inserts three lines into the internal table ITAB using the APPEND statement and the SORTED BY addition. The line with the smallest value for the field COL2 is deleted from the table, since the number of lines that can be appended is fixed through the INITIAL SIZE 2 addition in the DATA statement.
SQL query is used for the fetching data from different tables,while report painter is used to display the data in some format.
Regards,
Veeresh