[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fXe8213R5jkH9MnWsjfjkdVNOY4gVOQOSz0ijCbhefAU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-05-11 21:34:37",6416686,[8,9,10,11],"在score表上定义了一个由数据更改操作引发的前触发型触发器","在score表上定义了一个由数据更改操作引发的后触发型触发器","在score表上定义了一个由数据增、删、改操作引发的后触发型触发器","在score表上定义了一个由数据增、删、改操作引发的前触发型触发器",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},28,"e37fc19f0bb6eaa533b766a37f42cc69","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff979fa540b9f580f2caa695c807117db.png","数据库原理及应用（2022-2023-2）","515795ca54654bb187bba8d21b71ab71","触发器和关系代数习题","设在MySQL中有如下定义触发器的语句: CREATE TRIGGER tr_updateStuScore AFTER UPDATE ON score FOR EACH ROW &hellip;&hellip; 下列关于该触发器作用的说法,正确的是()",[21,32,35,44,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],6416685,[25,26,27,28],"select","insert","update","delete","当对表进行哪项操作时触发器不会自动执行( )","v1",0,{"answer":33,"createTime":5,"id":6,"options":34,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":30,"type":31},[],6416687,[39,40,41,42],"触发器可以传递参数","触发器是SQL语句的集合","用户不能调用触发器","可以通过触发器来强制实现数据的完整性和一致性","以下对触发器的叙述中,不正确的是()",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],6416688,[48,49,50,51],"CREATE TABLE","CREATE TRIGGER","CREATE ENGINE","CREATE VIEW","创建触发器使用哪个命令()",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],6416689,[57,58,59,60],"ALTER","DELETE","DROP","REMOVE","删除触发器使用哪个命令( )",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],6416690,[66,67,68,69],"ALTER TRIGGERS","SELECT TRIGGERS","DISPLAY TRIGGERS","SHOW TRIGGERS","查看指定数据库中已存在的触发器语句、状态等信息,使用( )",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],6416691,[75,76,77,78],"FRONT","AFTER","AHEAD","BEFORE","表示前触发使用的关键词是( )",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],6416692,[84,85,86,87],"排序、索引、统计","关联、更新、排序","选择、投影、连接","显示、打印、制表","关系数据库管理系统应能实现的专门关系运算包括( )",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],6416693,[93,94,95,96],"行","属性","记录","元组","自然连接是构成新关系的有效方法.一般情况下,当对关系R和S使用自然连接时,要求R和S含有一个或多个共有的&mdash;&mdash;",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],6416694,[102,103,104,105],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F73eebb02bec7b12fe697e566d880a875.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F91830563936a84e32a7aa657416f3105.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffd75b5b6d960f89889b79706f130333c.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8c729447fe301c13167d2c9357685dd7.png\">","设关系R(A,B,C)和S(B,C,D),下列各关系代数表达式不成立的是( )"]