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Which PL/SQL block type must return a value?

In PL/SQL, which clause is used to store the result of a query into a variable?

Which of the following is a valid SQL statement?

Which type of constraint should you use on a column to allow entering only values above 1000?

What keyword is used to check multiple conditions with an IF statement?

Consider the following anonymous block:  BEGIN   INSERT INTO countries (id, name)  VALUES (‘XA’, ‘Xanadu’);  SAVEPOINT XA;   INSERT INTO countries (id, name)  VALUES (‘NV’,’Neverland’);  COMMIT;   ROLLBACK TO XA; END; What happens when the block of code finishes?

What happens if a SELECT … INTO query returns multiple rows?

Which of the following variable declarations are valid?

Which of the following correctly compares topic modeling and text classification?

A marketing team wants to group customers based on their purchasing habits but does not have predefined customer segments. Which type of machine learning should they use?