A.80M B.40M C.30M D.50M
A.需求分析 B.物理設(shè)計(jì) C.邏輯結(jié)構(gòu)設(shè)計(jì) D.概念結(jié)構(gòu)設(shè)計(jì)
A.int B.datetime C.money D.tinyint