Delete all the database table content

Hello Friends,
I have a z table with 5 fields (all the key fields) and I want to delete all the table content and load fresh content from internal table.
I tried using syntax 'delete ztable' but sy-subrc value is coming as 4, means no table content is getting deleted.
Please suggest me any alternative way to delete all the database table content.
Thanks in advance,
Shreekant

Hi,
try using
delete from ztable.
This will delete all records from your ztable. After this command u can fill your ztable from itab by the following command
select *
from std table
into corresponding fields of itab.
insert ztable from table itab.
Hopefully this will solve your problem.
Regards,
Ibrar

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I have the next form:
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