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merge-multiple-columns-into-one-column-with-multiple-rows

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   id a b c
1 1 0 1 0
2 2 1 1 0
3 3 0 0 1
4 4 1 0 1
5 5 1 0 0
6 6 0 1 1
   id l
1 1 b
2 2 a
3 2 b
4 3 c
5 4 a
6 4 c
7 5 a
8 6 b
9 6 c

    
                
λ
.NET NoSQL database for rapid development