[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fA6X7NcSY-jSXs7g51mAH7WfU0sHWaJHoNajtmHPu2R8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2024-12-21 21:47:10",172915886,[8,9,10,11],"索引可以提高数据插入、更新和删除的速度","唯一索引允许字段值为空,但不允许有重复值","主键索引是一种特殊的唯一索引,且不允许字段值为空","全文索引只能用于搜索英文文本,不能用于搜索中文等其他语言文本",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},114,"96345a70b762977862f3ed1eb95f3871","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd7863949b03fc5a6aa004a39296480e1.png","数据库技术","work_39767449","复习","以下关于索引的说法,正确的是( )",[21,33,43,52,61,71,80,89,98,107],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2024-12-21 21:47:07",172915860,[26,27,28,29],"VARCHAR","CHAR","INT","FLOAT","在 MySQL 中,以下哪种数据类型适合存储类似 "读者编号" 这样固定长度的字符数据?( )","v1",0,{"answer":34,"createTime":35,"id":36,"options":37,"question":42,"source":31,"type":32},[],"2024-12-21 21:47:08",172915864,[38,39,40,41],"SQL 语句不区分大小写","在 SQL 中,注释只能使用 "--" 开头,不能使用 "\u002F* *\u002F"","每条 SQL 语句必须以分号 ";" 结尾","SQL 语句中不能使用空格来提高可读性","以下关于 SQL 语句的描述,正确的是( )",{"answer":44,"createTime":35,"id":45,"options":46,"question":51,"source":31,"type":32},[],172915866,[47,48,49,50],"SHOW TABLES","DESC table_name;(其中 table_name 为具体表名)","SHOW COLUMNS FROM database_name;(其中 database_name 为数据库名)","USE database_name;(其中 database_name 为数据库名)","要查看数据库中所有表的结构信息,可以使用以下哪个命令?( )",{"answer":53,"createTime":35,"id":54,"options":55,"question":60,"source":31,"type":32},[],172915870,[56,57,58,59],"SELECT 书名,作者 FROM 图书表 WHERE 类别 = ' 计算机 '","SELECT * FROM 图书表 WHERE 类别 = ' 计算机 '","SELECT 书名,作者 FROM 图书表 WHERE 类别 LIKE '% 计算机 %'","SELECT 书名,作者 FROM 图书表 HAVING 类别 = ' 计算机 '","从 "图书表" 中查询所有计算机类图书的书名和作者,正确的 SQL 语句是( )",{"answer":62,"createTime":63,"id":64,"options":65,"question":70,"source":31,"type":32},[],"2024-12-21 21:47:09",172915874,[66,67,68,69],"读者表、借阅表","读者表、借阅表、图书表","借阅表、图书表","读者表、图书表","要查询借阅了图书且借阅状态为 "借阅" 的读者姓名和所借图书书名,需要连接哪些表?( )",{"answer":72,"createTime":63,"id":73,"options":74,"question":79,"source":31,"type":32},[],172915877,[75,76,77,78],"SELECT 类别,COUNT (*) FROM 图书表 GROUP BY 类别","SELECT 类别,SUM (数量) FROM 图书表 GROUP BY 类别","SELECT 类别,AVG (数量) FROM 图书表 GROUP BY 类别","SELECT 类别,MAX (数量) FROM 图书表 GROUP BY 类别","以下查询语句中,能够正确统计每个类别图书数量的是( )",{"answer":81,"createTime":63,"id":82,"options":83,"question":88,"source":31,"type":32},[],172915880,[84,85,86,87],"INSERT INTO 读者表 VALUES ('0003', ' 王五 ', '1', ' 管理学院 ', ' 有效 ')","INSERT INTO 读者表 (读者编号,姓名,类别号,单位,有效性) VALUES ('0003', ' 王五 ', '1', ' 管理学院 ')","INSERT INTO 读者表 (读者编号,姓名,类别号,单位) VALUES ('0003', ' 王五 ', '1', ' 管理学院 ', ' 有效 ')","INSERT INTO 读者表 ('0003', ' 王五 ', '1', ' 管理学院 ', ' 有效 ')","向 "读者表" 中插入一条新记录('0003',' 王五 ','1',' 管理学院 ',' 有效 '),正确的 SQL 语句是( )",{"answer":90,"createTime":63,"id":91,"options":92,"question":97,"source":31,"type":32},[],172915882,[93,94,95,96],"UPDATE 借阅表 SET 借阅状态 = ' 已还 ', 还书日期 = CURDATE () WHERE 借阅号 = 100005","UPDATE 借阅表 SET 借阅状态 = ' 已还 ', 还书日期 = 'CURDATE ()' WHERE 借阅号 = 100005","UPDATE 借阅表 SET 借阅状态 = ' 已还 ' or 还书日期 = CURDATE () WHERE 借阅号 = 100005","UPDATE 借阅表 (借阅状态,还书日期) VALUES (' 已还 ', CURDATE ()) WHERE 借阅号 = 100005","在 "借阅表" 中,将借阅号为 100005 的记录的借阅状态更新为 "已还",并将还书日期设置为当前日期,正确的 SQL 语句是(假设当前日期函数为( )",{"answer":99,"createTime":63,"id":100,"options":101,"question":106,"source":31,"type":32},[],172915884,[102,103,104,105],"在 "借阅表" 的 "借阅号" 字段上创建普通索引","在 "借阅表" 的 "读者编号" 字段上创建普通索引","在 "借阅表" 的 "借阅日期" 字段上创建普通索引","在 "借阅表" 的 "借阅状态" 字段上创建普通索引","为了提高在 "借阅表" 中根据读者编号查询借阅记录的速度,以下哪种索引创建方式最合适?( )",{"answer":108,"createTime":5,"id":6,"options":109,"question":19,"source":31,"type":32},[],[8,9,10,11]]