Question

For example, I inserted 2 rows into database: first with “1” _ID and second with “2” _ID. If I delete the second row and insert a new one it will have “2” _ID again. Is it possible to set rule for database which increase _ID always? In my case, a new one will have “3” _ID instead of “2”. Thank you in advance.

Answer 1

You can use the AUTOINCREMENT keyword on your _ID column. This will guarantee that automatically chosen ROWIDs will be increasing.

From the SQLite documentation:

Note that “monotonically increasing” does not imply that the ROWID
always increases by exactly one. One is the usual increment. However,
if an insert fails due to (for example) a uniqueness constraint, the
ROWID of the failed insertion attempt might not be reused on
subsequent inserts, resulting in gaps in the ROWID sequence.
AUTOINCREMENT guarantees that automatically chosen ROWIDs will be
increasing but not that they will be sequential.