Difference between Internal Table declarations OCCURS and TYPE TABLE OF?

Question

And which one should be preferred / why?

So I have a TYPE defined locally:

TYPES:
    BEGIN OF CUSTOMER_STRU_TYPE,
        KUNNR TYPE KNA1-KUNNR,
        NAME1 TYPE KNA1-NAME1,
    END OF CUSTOMER_STRU_TYPE.

and I think these 2 statements seen below will both do the same thing:

DATA:
    CUSTOMER_TAB TYPE CUSTOMER_STRU_TYPE OCCURS 5.

DATA:
    CUSTOMER_TAB TYPE STANDARD TABLE OF CUSTOMER_STRU_TYPE.

Are there any differences between the 2 statements seen above and which one should be preferred?

You have already asked about it. The first statement with OCCURS defines an internal table with header line, the other defines an internal table without header line. OCCURS 5 means that initially there will be assigned memory for 5 rows. — Jagger
Possible duplicate of What is WITH HEADER LINE used for in ABAP? — Jagger
Hi @Jagger . The difference between those 2 are: the existing / lack of: STANDARD TABLE OF not "WITH HEADER LINE".. This is a different question actually. — Koray Tugay
With all due respect I disagree. :) Especially that I mentioned about STANDARD TABLE OF WITH HEADER LINE in one of the comments there. — Jagger
@Jagger Well ok, you are probably right. I am very new to SAP / ABAP so I am still trying to understand. I think it will make sense with time, I am just confused at the moment. Thank you for your help. — Koray Tugay

David David · Accepted Answer · 2016-04-08T06:28:11

The main difference between the two statements is that, in the first one you're reserving memory space for storing 5 lines of customer_tab table. In terms of performance, the best statement is the second one.

Difference between Internal Table declarations OCCURS and TYPE TABLE OF?

1 Answers