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Co-Related sub query

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Execution time: 0,02 sec, rows selected: 10, rows affected: 4, absolute service time: 0,22 sec, absolute service time: 0,22 sec  
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   roleid comid
1 1 A
2 1 B
3 2 C
4 2 D
   roleid comid
1 1 A, B
2 2 C, D
   XML_F52E2B61-18A1-11d1-B105-00805F49916B
1 , A, B, C, D