试题与答案

对所有商品单价大于3000元的商品打九折,下列SQL语句正确的是______。A.U

题型:单项选择题

题目:

对所有商品单价大于3000元的商品打九折,下列SQL语句正确的是______。

A.UPDATE 商品表 SET 单价=单价*0.9 WHERE 单价>3000

B.UPDATE 商品表 SET 单价=单价*0.9 IN 单价>3000

C.SET 单价=单价*0.9 WHERE IN 商品表

D.MODIFY 商品表 SET单价*0.9 WHERE 单价>3000

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D解析:战略控制通常期间较长,预算控制较短;战略控制通常采用定性和定量方法,预算控制仅采用定量方法;战略控制的重点是内部和外部,预算控制的重点是内部;战略控制通常不断采取纠错措...

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