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下面的SQL过程中，哪一个从句是不正确的？ （） proc sql; select age, mean（weight) as avgweight from certadv.employees certadv.health where employees.id=health.id group by age; quit;
A．SELECT
B．FROM
C．WHERE
D．GROUP BY
参考答案和解析
一个基本表只能存储在一个存储文件中
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