price BETWEEN 50 AND 100 等价于 price>50 AND price<100。( )
price BETWEEN 50 AND 100 等价于 price>50 AND price<100。( )
检查约束中，要求价格大于20，表达式为（）。 A: …… check (price >20) B: …… check (price <30) C: …… check (price between 20 and 30) D: 都不是
检查约束中，要求价格大于20，表达式为（）。 A: …… check (price >20) B: …… check (price <30) C: …… check (price between 20 and 30) D: 都不是
下列多条件查询使用正确的有（） A: B: and查询db.collection.find({ $and : [ { "age" : {$gt : 10 }} , { "gender" : "man" } ]}) C: ＃or查询db.collection.find({ $or : [ {"age" : {$gt : 10 }}, { "gender" : "man"} ]}) D: E: and查询和or查询db.inventory.find( { $and : [ { $or : [ { price : 0.99 }, { price : 1.99 } ] }, { $or : [ { sale : true }, { qty : { $lt : 20 } } ] } ]} ) F: G: and查询和or查询db.inventory.find( { $or: [ { $and : [ { price : 0.99 }, { price : 1.99 } ] }, { $: [ { sale : true }, { qty : { $lt : 20 } } ] } ]} )
下列多条件查询使用正确的有（） A: B: and查询db.collection.find({ $and : [ { "age" : {$gt : 10 }} , { "gender" : "man" } ]}) C: ＃or查询db.collection.find({ $or : [ {"age" : {$gt : 10 }}, { "gender" : "man"} ]}) D: E: and查询和or查询db.inventory.find( { $and : [ { $or : [ { price : 0.99 }, { price : 1.99 } ] }, { $or : [ { sale : true }, { qty : { $lt : 20 } } ] } ]} ) F: G: and查询和or查询db.inventory.find( { $or: [ { $and : [ { price : 0.99 }, { price : 1.99 } ] }, { $: [ { sale : true }, { qty : { $lt : 20 } } ] } ]} )
下列选项中与“WHERE (id,price)=(3,1999)”功能相同的是( ) A: WHERE id=3 || price=1999 B: WHERE id=3 && price=1999 C: WHERE (id,price)<>(3,1999) D: 以上选项都不正确
下列选项中与“WHERE (id,price)=(3,1999)”功能相同的是( ) A: WHERE id=3 || price=1999 B: WHERE id=3 && price=1999 C: WHERE (id,price)<>(3,1999) D: 以上选项都不正确
查询比计算机类图书便宜的书,语句中 SELECT name ,price from book where price____ (select price from book where category='计算机')缺省的部分应是（）。 A: > all B: > any C: < any D: < all
查询比计算机类图书便宜的书,语句中 SELECT name ,price from book where price____ (select price from book where category='计算机')缺省的部分应是（）。 A: > all B: > any C: < any D: < all
以下代码的输出结果是（）。publicclassTest{publicstaticvoidmain(String[]args){double[]price=newdouble[5];price[0]=98.10;price[1]=32.18;price[2]=77.75;System.out.print((int)price[0]+""+(int)price[1]+""+(int)price[2]+""+(int)price[3]+""+(int)price[4]);}}
以下代码的输出结果是（）。publicclassTest{publicstaticvoidmain(String[]args){double[]price=newdouble[5];price[0]=98.10;price[1]=32.18;price[2]=77.75;System.out.print((int)price[0]+""+(int)price[1]+""+(int)price[2]+""+(int)price[3]+""+(int)price[4]);}}
设变量已正确定义,选项()与以下程序段不等价。switch(choice){case1:price=3.0;case2:price=2.5;default:price=0.0;}A.price=0.0;B.switch(choice){default:price=0.0;case2:price=2.5;case1:price=3.0;}C.price=0.0;switch(choice){case1:price=3.0;case2:price=2.5;}D.if(choice==1){price=3.0;price=2.5;price=0.0;}elseif(choice==2){price=2.5;price=0.0;}else{price=0.0;}
设变量已正确定义,选项()与以下程序段不等价。switch(choice){case1:price=3.0;case2:price=2.5;default:price=0.0;}A.price=0.0;B.switch(choice){default:price=0.0;case2:price=2.5;case1:price=3.0;}C.price=0.0;switch(choice){case1:price=3.0;case2:price=2.5;}D.if(choice==1){price=3.0;price=2.5;price=0.0;}elseif(choice==2){price=2.5;price=0.0;}else{price=0.0;}
A—cost price B—factory priceC—net price D—price free on boardE—purchase price F—sale priceG—wholesale price H—purchase priceI—fixed price J—guaranteed priceK—cash price L—market priceM—preferential price N—piece priceO—price control P—maximum priceQ—minimum price （）批发价（）单位价格
A—cost price B—factory priceC—net price D—price free on boardE—purchase price F—sale priceG—wholesale price H—purchase priceI—fixed price J—guaranteed priceK—cash price L—market priceM—preferential price N—piece priceO—price control P—maximum priceQ—minimum price （）批发价（）单位价格
为查询Products表中,价格Price在5－10元之间的产品信息，请补全以下SELECT语句 SELECT ProductID,ProductName,Price FROM products WHERE_________ AND_________ A: price>=5,price<=10 B: price>5,price<10 C: price<=5,price<=10 D: price>=5,price>=10
为查询Products表中,价格Price在5－10元之间的产品信息，请补全以下SELECT语句 SELECT ProductID,ProductName,Price FROM products WHERE_________ AND_________ A: price>=5,price<=10 B: price>5,price<10 C: price<=5,price<=10 D: price>=5,price>=10
During a Deal, the reference price can be either Your Price or Sales Price, whichever is higher. You are allowed to change the Your Price or Sales Price fields to keep the reference price lower than Sales Price or Your Price.( )
During a Deal, the reference price can be either Your Price or Sales Price, whichever is higher. You are allowed to change the Your Price or Sales Price fields to keep the reference price lower than Sales Price or Your Price.( )