O comando SQL para obter, a partir de uma tabela X, o ca...

A

SELECT D, LENGHT (D) FROM X WHERE E IS NULL.

B

SELECT D, LENGHT (D) FROM E WHERE X IS NULL.

C

SELECT D, LENGHT (E) FROM X WHERE D IS NULL

D

SELECT X, LENGHT (X) FROM D WHERE E = NULL.

E

SELECT D, MAX (D) FROM X WHERE E = 0.