Jaký příkaz smaže z tabulky copyemployees všechny záznamy, kde je salary NULL?
Vyberte jednu odpověď.

Question

Jaký příkaz smaže z tabulky copyemployees všechny záznamy, kde je  salary  NULL? 
 Vyberte jednu odpověď.

Answer

DELETE FROM copyemployees WHERE salary IS NULL;

Answer

DELETE salary IS NULL FROM copyemployees;

Answer

DELETE FROM copyemployees WHERE NVL(salary,0) = 0;

Answer

DELETE FROM copyemployees WHERE salary = NULL;

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