What the difference and use between of TABLES and SY-REPID?

Hi,
Experts,
I have came accross 2 cases that i can't able understand
EX1:
TABLES: VBAP   -
>( Here also Appplication Server(AS) creates Wrokarea of Structure VBAP but, by
data: v_vbeln like vbap-vbeln.    double clicking on variable v_vbeln AS taking me to DDIC VBAP table VBELN field then what the using declaring tables. )
( and )
DATA: VBAP TYPE VBAP -->( Here also Appplication Server(AS) creates Wrokarea of Structure VBAP data: v_vbeln like vbap-vbeln.    but,double clicking on variable v_vbeln AS taking me to user declared VBAP
                                              i.e., above DATA declaration statement )
Then Which one is better in Functionality wise as well as Performance wise or when we have to go for TABLES and when we have to go for DATA declaration of DDIC objects.
EX2:
what the difference between
I know that SY_REPID is not a system variable. And also that
Data: vrepid type SY_REPID.--> Predefined data type in ABAP
and
Data: vrepid like SY_REPID.-> Predefined Constatnt in ABAP( it is a constant it allowing with out VALUE
attribute)
what difference between them and when we have to go Data: vrepid type SY_REPID and when we have to go Data: vrepid like SY_REPID.
Thank U,
Shabeer Ahmed.

Hi Ahmed,
TABLES:
VBAP. " DDIC
DATA:
v_vbeln like vbap-vbeln.
*Here you are using the DDIC VBAP
DATA:
VBAP TYPE VBAP.
DATA:
vbeln like vbap-vbeln.
*Here you are using the local data object as your data type so it will always
* take you to user declared VBAP which is declared by you.
DATA:
T_VBAP TYPE VBAP.
DATA:
vbeln like vbap-vbeln.
* here its using T_VBAP not DDIC VBAP
And for performance always the second option is better, use Data instead of tables, declare your own local structure.
Data:
vrepid type SY_REPID. thereis nop redefined data type in ABAP as SY_REPID
* its SY-REPID which is a system variable.
Data:
vrepid type SY-REPID.
Also refer to the links:
Difference between tables statement and by using type statement
for type and like:
Re: LIKE and Type in abap statements
With luck,
Pritam.

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Hello
From the docs:
ALL
If you specify ALL, then Oracle evaluates each WHEN clause regardless of the results of the evaluation of any other WHEN clause. For each WHEN clause whose condition evaluates to true, Oracle executes the corresponding INTO clause list.
FIRST
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* If you did not specify an else clause, then Oracle takes no action for that row.
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2 /
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SQL> CREATE TABLE dt_test_insert_1 (id number)
2 /
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2 /
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SQL>
SQL> INSERT ALL
2 WHEN rownum <=15 THEN
3 INTO dt_test_insert_1 (id)
4 WHEN rownum >=10 THEN
5 INTO dt_test_insert_2 (id)
6 SELECT
7 ID
8 FROM
9 dt_test_insert_base
10 /
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SQL>
SQL> SELECT * from dt_test_insert_1
2 /
 ID
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
15 rows selected.
SQL> SELECT * from dt_test_insert_2
2 /
 ID
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
11 rows selected.
SQL>
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2 /
Table truncated.
SQL> TRUNCATE TABLE dt_test_insert_2
2 /
Table truncated.
SQL>
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2 WHEN rownum <=15 THEN
3 INTO dt_test_insert_1 (id)
4 WHEN rownum >=10 THEN --This condition is ignored until the value of id is > 15
5 INTO dt_test_insert_2 (id)
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7 ID
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2 /
 ID
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15
15 rows selected.
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2 /
 ID
 16
 17
 18
 19
 20HTH
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