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SELECT wm_concat(e_name)|| t_name ) from test1 t, test2 R where t.tid = r.tID
ORA-22813: operand value exceeds system limits 22813. 00000 - "operand value exceeds system limits" *Cause: Object or Collection value was too large. The size of the value might have exceeded 30k in a SORT context, or the size might be too big for available memory. *Action: Choose another value and retry the operation