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Resetting serial type after "delete from table"

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If I "delete from table", which table contains a serial type field, and then insert new rows into the table "excluding the [serial] column from the list of columns in the INSERT statement", the numbers in the serial column resume where they left  off prior to the "delete from  table": 639, 640, 641, 642 for example.

This behavior is totally acceptable, but is it possible to have the serial column reset itself to 1 following  "delete from table" (i.e. following flushing all the rows from the table)?  The only way I can think to do this is by altering the table by dropping the serial column and then altering it again by adding a new serial column before doing the insert.  That is only a couple of more lines of script, so I don't do the work, but is there an easier way?

Thanks,

John

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