CatID parID catName
1 -1 A
2 1 B
3 2 C
4 3 D
CatID parID catName
1 -1 A
2 CatID parID catName
1 -1 A
2 1 B
3 2 C
4 3 D
CatID parID catName
1 -1 A
2