Question

What are predicates that define correct database states and relationship with in database?

Answer 1

Explanation:

The database schema of a database system is its structure described in a formal ... In a relational database, the schema defines the tables, fields, relationships, views, indexes, ...

Answer 2

Constraints are predicates that define correct database states and relationships with in database.

A predicate is a condition expression that evaluates to either true or false as a boolean value. The following are some examples of predicates: To decide which rows are relevant to a given query, utilise the WHERE clause or HAVING clause in a SELECT statement. It's important to keep in mind that not all predicates can be utilised in a HAVING clause.