Calling DELETE ADJACENT DUPLICATES won’t reliably do any good if the table hasn’t first been sorted to put duplicates side by side,
since the ADJACENT part of the command looks for multiple rows side-by-side with the same content.
Noncompliant code example
DELETE ADJACENT DUPLICATES FROM ITAB COMPARING LAND.
Compliant solution
SORT ITAB BY LAND.
DELETE ADJACENT DUPLICATES FROM ITAB COMPARING LAND.
