--first delete all data from tables and then reset
If you want to reset only one table colum then
DBCC CHECKIDENT('Roles', RESEED, 0)
--if you want to reset from 2 3 upto any no then pass this no in query
exec sp_MSforeachtable @command1 = 'DBCC CHECKIDENT (''?'', RESEED,0)'
--Reset autoincrement id as 1 of all tables
