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SELECT DISTINCT CUSTOMER.CNO, CUSTOMER.COMPANY, COUNT(INO)
FROM RK0.INVOICES, RK0.CUSTOMER
WHERE INVOICES.CNO=CUSTOMER.CNO
GROUP BY CUSTOMER.CNO, CUSTOMER.COMPANY
HAVING COUNT(INO)<2
UNION
(SELECT DISTINCT CUSTOMER.CNO, CUSTOMER.COMPANY, 0
FROM RK0.CUSTOMER
GROUP BY CUSTOMER.CNO, CUSTOMER.COMPANY
MINUS
SELECT CUSTOMER.CNO, CUSTOMER.COMPANY, COUNT(INO)
FROM RK0.CUSTOMER, RK0.INVOICES
WHERE CUSTOMER.CNO=INVOICES.CNO
GROUP BY CUSTOMER.CNO, CUSTOMER.COMPANY)
SELECT C.CNO, C.COMPANY, COUNT(I.INO)
FROM RK0.CUSTOMER C, RK0.INVOICES I
WHERE C.CNO=I.CNO
UNION
(SELECT C.CNO, C.COMPANY, 0
FROM RK0.CUSTOMER C
MINUS
SELECT C.CNO, C.COMPANY, 0
FROM RK0.CUSTOMER C, RK0.INVOICES I
WHERE C.CNO=I.CNO)
SELECT CUSTOMER.CNO, CUSTOMER.COMPANY, COUNT(INVOICES.INO)
FROM RK0.CUSTOMER, RK0.INVOICES
WHERE CUSTOMER.CNO=INVOICES.CNO
GROUP BY CUSTOMER.CNO, CUSTOMER.COMPANY
HAVING COUNT(INVOICES.INO)<2
UNION
SELECT CUSTOMER.COMPANY, CUSTOMER.CNO, 0
FROM RK0.CUSTOMER
WHERE CUSTOMER.CNO NOT IN
(SELECT INVOICES.CNO FROM RK0.INVOICES)
SELECT THE BEST INVOICE(HIGHEST ITOTAL):
INO, DATE, ITOTAL, COMPANY, NAME OF THE SALESMAN
SELECT INVOICES.INO, INVOICES.IDATE, INVOICES.ITOTAL, CUSTOMER.COMPANY, SALESMAN.NAME
FROM RK0.INVOICES, RK0.CUSTOMER, RK0.SALESMAN
WHERE INVOICES.CNO=CUSTOMER.CNO AND (SELECT MAX(INVOICES.ITOTAL) FROM RK0.INVOICES)= INVOICES.ITOTAL AND SALESMAN.SALESMAN=INVOICES.SALESMAN
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