Create automatic indexing( id)  in the DB

what snippet should i use to create automatic indexing( id) in the DB ?
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not by count++ but by triggering DB ...how it is done ?

what snippet should i use to create automatic
indexing( id) in the DB ?
like
1
2
3
4
5...
not by count++ but by triggering DB ...how it is done
?Depends on the database. Some databases have SEQUENCE types, which you manipulate via SQL statements; others have IDENTITY or AUTOINCREMENT (?)types of field attributes, which automatically increment when you insert a row.

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