A: Select firstname +’.’+ lastname as ‘name’ from employee
B: Select firstname +’.’+ lastname from employee
C: Select ‘name’= firstname +’.’+ lastname from employee
D: Select firstname,lastname from employee
举一反三
- employee表中lastname列保存顾客姓，firstname列保存顾客的名，现在，需要查询顾客的姓名的组合，例如，lastname列中的”张“，同一行firstname列中的”国华“，查询结果应该返回”张国华“，则正确的查询语句应该是（ ） A: select lastname,firstname from employee B: select * from employee order by lastname,firstname C: select lastname+firstname from employee D: select lastname and firstname from employee
- 现有表Employee，字段：id（int）、firstname（varchar）、lastname（varchar）；以下sql语句错误的是（）
- 通过 SQL，在表 Actor 中选择 FirstName 等于 Jim 而 LastName 等于 Carter 的所有记录的表述正确的是（ ）。? SELECT * FROM Actor WHERE FirstName LIKE 'Jim' AND LastName LIKE 'Carter'|SELECT * FROM Actor WHERE FirstName='Jim' OR LastName='Carter'|SELECT FirstName='Jim', LastName='Carter' FROM Actor|SELECT * FROM Actor WHERE FirstName='Jim' AND LastName='Carter'
- 通过 SQL，在表 Actor 中选择 FirstName 等于 Jim 而 LastName 等于 Carter 的所有记录的表述正确的是（ ）。 A: SELECT * FROM Actor WHERE FirstName LIKE 'Jim' AND LastName LIKE 'Carter' B: SELECT FirstName='Jim', LastName='Carter' FROM Actor C: SELECT * FROM Actor WHERE FirstName='Jim' AND LastName='Carter' D: SELECT * FROM Actor WHERE FirstName='Jim' OR LastName='Carter'
- Employee 表中LastName列保存顾客的姓，FirstName列保存顾客的名。现在，需要查询顾客姓名的组合，例如，LastName列中的“张”，同一行FirstName列中的“国华”，查询结果应该返回“张国华”，则正确的查询语句应该是（）。 A: SELECT LastName, FirstName FROM Employee B: SELECT SName, SYSTEM_USER AS 查询用户 FROM Students C: SELECT SName, 查询用户 FROM Students D: SELECT SName, SYSTEM_USER=查询用户 FROM Students
内容
- 0
通过 SQL，您如何在表 Persons 中选择 FirstName 等于 Thomas ，并 且LastName 等于 Carter 的所有记录？ A: SELECT * FROM Persons WHERE FirstName LIKE 'Thomas' AND LastName LIKE 'Carter' B: SELECT FirstName='Thomas', LastName='Carter' FROM Persons C: SELECT * FROM Persons WHERE FirstName='Thomas' AND LastName='Carter'
- 1
Employees表中lastname列保存顾客的姓，firstname列保存顾客的名。现在需要查询顾客姓名的组合，例如lastname列中的“张”，同一行firstname列中的“国华”，查询结果应该返回“张国华”，则正确的查询语句应该是（） A: select lastname,firstname from employees B: select * from employees order by lastname,firstname C: select lastname+firstname from employees D: select lastname and firstname from employees
- 2
从"actor"表中选取"FirstName"列的SQL语句是()。 A: select actor.FirstName B: select FirstName from actor C: extract FirstName from actor D: update FirstName from actor
- 3
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
- 4
通过 SQL，您如何从 "Persons" 表中选取 "FirstName" 列的值以 "a" 开头的所有记录？ A: SELECT * FROM Persons WHERE FirstName LIKE 'a%' B: SELECT * FROM Persons WHERE FirstName='a' C: SELECT * FROM Persons WHERE FirstName LIKE '%a' D: SELECT * FROM Persons WHERE FirstName='%a%'