How to join two internal table rows in alternative manner into one internal table?

Question

How to join two internal table rows in alternative manner into one internal table?
two internal tables are suppose itab1 &  itab2 & its data
Header 1
Header 2
Header 3
a
b
c
d
e
f
g
h
i
Header 1
Header 2
Header 3
1
2
3
4
5
6
7
8
9
INTO itab3 data
Header 1
Header 2
Header 3
a
b
c
1
2
3
d
e
f
4
5
6
g
h
i
7
8
9

Answer 1

Hi Soubhik,
I have added two additional columns for each internal table.
Table_Count - It represents the Internal Table Number(ITAB1 -> 1, ITAB2 -> 2)
Row_Count  - It represents the Row Count Number, increase the row count value 1 by one..
ITAB1:
Header 1
Header 2
Header 3
Table_Count
Row_Count
a
b
c
1
1
d
e
f
1
2
g
h
i
1
3
ITAB2:
Header 1
Header 2
Header 3
Table_Count
Row_Count
1
2
3
2
1
4
5
6
2
2
7
8
9
2
3
Create the Final Internal table as same as the ITAB1/ITAB2 structure.
"Data Declarations
DATA: IT_FINAL LIKE TABLE OF ITAB1.          "Final Internal Table
FIELD-SYMBOLS: <FS_TAB1> TYPE TY_TAB1,     "TAB1
                               <FS_TAB2> TYPE TY_TAB2.     "TAB2
"Assign the values for the additional two column for ITAB1
LOOP AT ITAB1 ASSIGNING <FS_TAB1>.
     <FS_TAB1>-TABLE_COUNT = 1.             "Table value same for all row
     <FS_TAB1>-ROW_COUNT = SY-TABIX. "Index value
ENDLOOP.
"Assign the values for the additional two column for ITAB2
LOOP AT ITAB2 ASSIGNING <FS_TAB2>.    
     <FS_TAB2>-TABLE_COUNT = 2.                  "Table value same for all row
     <FS_TAB2>-ROW_COUNT = SY-TABIX.      "Index value
ENDLOOP.
"Copy the First Internal Table 'ITAB1' to Final Table
IT_FINAL[] = ITAB1[].
"Copy the Second Internal Table 'ITAB2' to Final Table
APPEND IT
LOOP AT ITAB2 INTO WA_TAB2.
APPEND WA_TAB2 TO IT_FINAL.
ENDLOOP.
"Sort the Internal Table based on TABLE_COUNT & ROW_COUNT
SORT IT_FINAL BY  ROW_COUNT TABLE_COUNT.
After sorting, check the output for IT_FINAL Table, you can find the required output as shown above.
Regards
Rajkumar Narasimman