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DROP stock DELETE TABLE stock DROP TABLE stock DELETE stock
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股票代码 股票名称 单价 交易所 600600 青岛啤酒 7.48 上海 I.600601 J.方正科技 K.15.20 L.上海 M.600602 N.广电电子
DROP stock DELETE TABLE stock DROP TABLE stock DELETE stock
SELECT *FROM stock WHERE 单价<=15.20.AND.单价>=12.76 SELECT *FROM stock WHERE 单价<15.20.AND.单价>12.76 SELECT *FROM stock WHERE 单价>=15.20 .AND. 单价<=12.76 SELECT *FROM stock WHERE 单价>15.20.AND.单价<12.76
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可以使用MODIFY STRUCTURE命令修改视图的结构 视图不能删除,否则影响原来的数据文件 视图是对表的复制产生的 使用SQL对视图进行查询时,必须事先打开该视图所在的数据库
DROP stock DELETE TABLE stock DROP TABLE stock DELETE stock
a[1]的内容为15.20 a[1]的内容为6 a[0]的内容为15.20 s[0]的内容为6
股票名称、单价 名称、单价 名称、单价、交易所 股票名称、单价、交易所