SQL質疑応答スレ 9問目

A, B, C, D
1, 1, 01, 20
1, 2, 02, 11
1, 3, 04, 22
1, 4, 04, 21
1, 6, 08, 12
1. 7, 04, 33
1, 8, 09, 12
2, 1, 04, 80
3, 1, 03, 01