Count how many orders were shared between customers, Sql Server

Count how many orders were shared between customers

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Execution time: 0 sec, rows selected: 6, rows affected: 7, absolute service time: 0,17 sec

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CustomerId
CustomerId
SharedOrders

1
C1
C2
0

2
C1
C3
2

3
C2
C3
0

4
C1
C4
0

5
C2
C4
1

6
C3
C4
0

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