【单选题】
A SELECT CUSTOMER_NUM,COUNT (CONTRACT_ID) cnt_con FROM con_contract GROUP BY CUST0MER_NUM HAVING cnt_con>10
B SELECT CUSTOMER_NUM,CUSTOMER NAME,COUNT (CONTRACT_ID) cnt_con FROM con_contract WHERE cnt_con > 10 GROUP BY CUSTOMER_NUM
C SELECT CuSTOME_NUM_COUNT (CONTRACT_ID)) cnt_con FROM con_contract WHERE cnt_con >10 GROUP BY CUSTOMER_NUM
D SELECT CUSTOMER_NUM,CUSTOMER_NAME,COUNT (CONTRACT_ID) cnt_con FROM con_contract GROUP BY CUSTOMER_NUM HAVING cnt_con>10
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