Consider the following relational schema and briefly answer the questions that follow: Emp $($eid: integer, ename: string, agentegersalaryreal$)$ Works $($eldinteger$,$ did: integer, pct theinteger$)$ Dept $($did: integer, budget: real, mana erid: integer$)$ Define an assertion on Dept that will ensure that all managers have age$>30.$ Compare this assertion with the equivalent table constraint. Explain which is better