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<b>QUESTION 127
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<p>Which statement adds a constraint that ensures the CUSTOMER_NAME column of the CUSTOMERS table holds a value? </p><table border="1" bordercolor="gray" width="665">
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<p><b><input type="radio" name="AN" value="A"> A.</b></p>
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<p> ALTER TABLE customers <br>ADD CONSTRAINT cust_name_nn <br>CHECK customer_name
IS NOT NULL;
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<p><b><input type="radio" name="AN" value="B"> B.</b></p>
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<p> ALTER TABLE customers <br>MODIFY CONSTRAINT cust_name_nn <br>CHECK customer_name IS NOT NULL;
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<p><b><input type="radio" name="AN" value="C"> C.</b></p>
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<p> ALTER TABLE customers <br>MODIFY customer_name <br>CONSTRAINT cust_name_nn NOT NULL;
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<p><b><input type="radio" name="AN" value="D"> D.</b></p>
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<p> ALTER TABLE customers <br>MODIFY customer_name <br>CONSTRAINT cust_name_nn IS
NOT NULL;
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<p><b><input type="radio" name="AN" value="E"> E.</b></p>
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<p> ALTER TABLE customers <br>MODIFY name <br>CONSTRAINT cust_name_nn NOT NULL;
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<p><b><input type="radio" name="AN" value="F"> F.</b></p>
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<p> ALTER TABLE customers <br>ADD CONSTRAINT cust_name_nn <br>CHECK customer_name
NOT NULL;</p>
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