Which of the following SQL statements determines how many total customers were referred by other customers? a.
Question:
Which of the following SQL statements determines how many total customers were referred by other customers?
a. SELECT customer#, SUM (referred)
FROM customers
GROUP BY customer#;
b. SELECT COUNT (referred)
FROM customers;
c. SELECT COUNT(*)
FROM customers;
d. SELECT COUNT(*)
FROM customers
WHERE referred IS NULL;
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