Explain what a Database instance is$?$

What is a superkey and a candidate key?

The primary key must be Either Unique or Not null. $(\frac{T}{F})$

Explain the meaning of referential integrity.

In the given Food Company relation below are there any redundancies and can we make a looseless decomposition?

$\backslash$table$[[$Item ID$,$Item Name,Company ID$,$Company Name,Company City$],[1,$Chex Mix,$16,$Akas Foods,Delhi$],[6,$Cheez$-$It$,15,$Jack Hill Ltd$,$London$],[2,$BN Biscuit,$15,$Jack Hill Ltd$,$London$],[3,$Mighty Munch,$17,$Foodies,London$],[4,$Pot rice,$15,$Jack Fill Ltd$,$London$],[5,$Jaffa Cakes,$18,$Order All,Boston$]]$Explain what a Database instance is$?$

What is a superkey and a candidate key?

The primary key must be Either Unique or Not null. $(\frac{T}{F})$

Explain the meaning of referential integrity.

In the given Food Company relation below are there any redundancies and can we make a looseless decomposition?

$\backslash$table$[[$Item ID$,$Item Name,Company ID$,$Company Name,Company City$],[1,$Chex Mix,$16,$Akas Foods,Delhi$],[6,$Cheez$-$It$,15,$Jack Hill Ltd$,$London$],[2,$BN Biscuit,$15,$Jack Hill Ltd$,$London$],[3,$Mighty Munch,$17,$Foodies,London$],[4,$Pot rice,$15,$Jack Fill Ltd$,$London$],[5,$Jaffa Cakes,$18,$Order All,Boston$]]$