单项选择题
A．SELECT 产品名称,AVG(单价) FROM 产品 GROUP BY 单价 B．SELECT 产品名称,AVG(单价) FROM 产品 ORDER BY 单价 C．SELECT 产品名称,AVG(单价) FROM 产品 ORDER BY 产品名称 D．SELECT 产品名称,AVG(单价) FROM 产品 GROUP BY 产品名称
A．NOT(X==Y)AND(X$Y) B．NOT(X$Y)OR(X<>Y) C．NOT(X>=Y) D．NOT(X$Y)
A．DO menul B．DO menul.mpr C．DO MENU menul D．RUN menul