阅读下面XML代码片段: Smith 下面选项中能匹配lang属性的Schema约束是
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- 阅读下面XML代码片段： Smith 28
- 下面代码的输出是什么?（） functionPerson(firstName,lastName){ this.firstName=firstName; this.lastName=lastName; } constlydia=newPerson("Lydia","Hallie"); constsarah=Person("Sarah","Smith"); console.log(lydia); console.log(sarah); A: Person{firstName:"Lydia",lastName:"Hallie"}andundefined B: Person{firstName:"Lydia",lastName:"Hallie"}andPerson{firstName:"Sarah",lastName:"Smith"} C: Person{firstName:"Lydia",lastName:"Hallie"}and{} D: Person{firstName:"Lydia",lastName:"Hallie"}andReferenceError
- 关系模式Sailors(sid,lastname.firtname,age,ratring)，其中lastname允许为空. 下面哪个语句能够查找出lastname属性值不为空的水手信息. A: SELECT * FROM SAILORS WHERE LASTNAME<>’NULL’ B: SELECT * FROM SAILORS WHERE LASTNAME<>NULL C: SELECT * FROM SAILORS WHERE LASTNAME IS not NULL D: SELECT * FROM SAILORS WHERE LASTNAME not LIKE ’NULL’
- 您如何把 "Persons" 表中 "LastName" 列的 "Gates" 改为 "Wilson" ？ A: MODIFY Persons SET LastName='Wilson' WHERE LastName='Gates' B: UPDATE Persons SET LastName='Wilson' WHERE LastName='Gates' C: UPDATE Persons SET LastName='Wilson' INTO LastName='Gates' D: MODIFY Persons SET LastName='Wilson' INTO LastName='Gates'
- 下面关于XML Schema约束文档中命名空间标准的描述,正确的是