问题
i'm new to postgres. if in sqlserver we have a table with auto-increment, and 10 rows... and the last row have id = 10. when you delete the last row, the next you insert will get the id = 10 too... sure?
but in postgres, using bigserial as pk, when i delete the row with the max Id, and insert a new row, it keeps incrementing more and more the pk number..
this is right?
回答1:
That's right. Read the manual about sequences.
bigserial and serial are just notational convenience for creating a bigint / integer column with the default set to nextval() from a connected sequence.
And it needs to be that way for safe concurrent use.
来源：https://stackoverflow.com/questions/16908432/when-delete-row-in-postgres-doesnt-decrement-serial-pk