【计算机类职业资格】上机操作题-试卷98及答案解析.doc

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1、上机操作题-试卷 98 及答案解析(总分:6.00,做题时间:90 分钟)一、基本操作题(总题数:1,分数:2.00)1.通过 SOL 语句为表“金牌榜”增加一个“奖牌总数”(整数型)字段,并为该字段设置有效性规则:奖牌总数=0。(分数:2.00)_二、简单应用题(总题数:1,分数:2.00)2.使用 SQL 的 ALTER TABLE 命令为“评委表”的“评委编号”字段增加有效性规则:评委编号的最左边两位字符是 11(使用 LEFT 函数)。(分数:2.00)_三、综合应用题(总题数:1,分数:2.00)3.使用 SQL 语句 ALTER TABLEUNIQUE将“课程表”中的“课程号”定义

2、为候选索引,索引名是temp。(分数:2.00)_上机操作题-试卷 98 答案解析(总分:6.00,做题时间:90 分钟)一、基本操作题(总题数:1,分数:2.00)1.通过 SOL 语句为表“金牌榜”增加一个“奖牌总数”(整数型)字段,并为该字段设置有效性规则:奖牌总数=0。(分数:2.00)_正确答案:(正确答案:ALTER TABLE 金牌榜 ADD 奖牌总数 INT CHECK 奖牌总数=0)解析:二、简单应用题(总题数:1,分数:2.00)2.使用 SQL 的 ALTER TABLE 命令为“评委表”的“评委编号”字段增加有效性规则:评委编号的最左边两位字符是 11(使用 LEFT 函数)。(分数:2.00)_正确答案:(正确答案:ALTER TABLE 评委表 ALTER 评委编号 SET CHECK LEFT(评委编号,2)=“11”)解析:三、综合应用题(总题数:1,分数:2.00)3.使用 SQL 语句 ALTER TABLEUNIQUE将“课程表”中的“课程号”定义为候选索引,索引名是temp。(分数:2.00)_正确答案:(正确答案:ALTER TABLE 课程表 ADD UNIQUE 课程号 TAG temp)解析:

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