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db<>fiddle
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id number name context
1 1234 Test 1 car
2 1235 Test 2 car
3 1236 Test 3 car
4 1237 Test 4 car
id parent child count
1 1234 1235 1
2 1234 1236 1
3 1236 1237 2
number name context count path
1234 Test 1 car null 1234
1235 Test 2 car 1 1234/1235
1236 Test 3 car 1 1234/1236
1237 Test 4 car 2 1234/1236/1237