The security personnel performed ``well within standards ' ' and the two staff aides were ``very sorry all this happened , ' ' Gainer said .
Gainer said the two staff aides are " very sorry this all happened , " and the security personnel had performed " well within standards . "
- represents data as two-dimensional tables called relations - relates data across tables based on common data element (primary and foreign key) - examples: db2, oracle, ms sql server, mysql