| SELECT | R1.A1, R2.A2, R3.A3, R4.A4 |
| FROM | R1, R2, R3, R4 |
| WHERE | R1.A2=R2.A2 AND R2.A3=R3.A3 AND |
| R3.A4=R4.A4 AND R4.A1=R1.A1 | |
| ORDER BY | w(R1) + w(R2) + w(R3) + w(R4) ASC |
| LIMIT | k |
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