Multiple choice softskills teamwork

Which four are valid Oracle constraint types? (Choose four.)

  1. CASCADE

  2. UNIQUE

  3. NONUNIQUE

  4. CHECK

  5. PRIMARY KEY

  6. NOT NULL
Reveal answer Fill a bubble to check yourself
B,D,E,F Correct answer
Explanation

Oracle constraint types are PRIMARY KEY, FOREIGN KEY, UNIQUE, CHECK, and NOT NULL. Options B, D, E, and F are all valid constraint types that enforce data integrity rules. CASCADE is a referential action, not a constraint type itself. NONUNIQUE is not a standard Oracle constraint.

AI explanation

To answer this question, you need to understand the concept of Oracle constraints. Oracle provides various types of constraints to enforce rules on the data stored in a table.

Let's go through each option to understand why it is correct or incorrect:

Option A) CASCADE - This option is incorrect because CASCADE is not a valid Oracle constraint type. CASCADE is used with foreign key constraints to define the action to be taken when a referenced row is deleted or updated.

Option B) UNIQUE - This option is correct. UNIQUE is a valid Oracle constraint type that ensures that all values in a column or set of columns are unique.

Option C) NONUNIQUE - This option is incorrect because NONUNIQUE is not a valid Oracle constraint type. The opposite of UNIQUE constraint is actually the default behavior, where duplicate values are allowed.

Option D) CHECK - This option is correct. CHECK is a valid Oracle constraint type that allows you to specify a condition that must be satisfied for the data in a column.

Option E) PRIMARY KEY - This option is correct. PRIMARY KEY is a valid Oracle constraint type that uniquely identifies each row in a table.

Option F) NOT NULL - This option is correct. NOT NULL is a valid Oracle constraint type that ensures that a column cannot contain any NULL values.

The correct answer is B, D, E, F. These options are correct because they represent valid Oracle constraint types.

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