Sequence does not reset after truncating the table

Question

I use SELECT lastval() to get wrong serial id after truncated the table.

when I truncate the table, I use SELECT lastval(), I got the wrong ID/

Answer 1

Following is the standard way to reset sequence:

truncate table table_name restart identity;

but in some version & platform, it's syntax error,

in that case, you can truncate without reset sequence, and alter the sequence with another sql, try this:

truncate table table_name;
alter sequence seq_name start 1;