过客 schrieb:
> [...] why in procedure TRUNCATE table
> demo do not reset auto_increment?

is clearly written in the documentation, just read ...

in short:

auto_increment is used for primary key, primary keys could be referenced
from another table, setting auto_increment back to 0 could lead to using a
primary key formerly used by another datarow and still referenced by another
table - could lead to data inconsistency.

-- 
Sebastian

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