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(单选题)5: 下面SQL语句中,求每个交易所的平均单价的语句是( )。
A: SELECT 交易所,avg(单价) FROM stock GROUPS BY 单价
B: SELECT 交易所,avg(单价) FROM stock ORDERS BY 单价
C: SELECT 交易所,avg(单价) FROM stock ORDER BY 交易所
D: SELECT 交易所,avg(单价) FROM stock GROUP BY 交易所
正确答案:
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