假设有两个数据库表isurance和 employee分别记录了某地所有工作人员的社保信息和基本信息：
insurance（id,isvalid），各属性分别表示身份证号、社保是否有效，其中isvalid=1表示社保有效，isvalid=0表示社保无效。
employee（id,name,salay,islocal），各属性分别表示身份证号、姓名、每月工资，户口是否在当地，其中islocal=1表示户口在当地，islocal=0表示户口不在当地。
2021年农历新年，为防控疫情，鼓励留在工作地过年，决定对社保有效且户口不在当地的人群发放津贴。可筛选出满足补贴发放条件人员的SQL语句为（ ）。
- A.SELECT * FROM employee, insurance WHERE insurance.id = employee.id AND insurance.isValid=1
- B.SELECT * FROM employee, insurance WHERE insurance.isvalid= 1 AND employee.islocal=0
- C.SELECT * FROM employee, insurance WHERE insurance.id = employee.id AND insurance.isvalid= 1 AND employee.islocal=0
- D.SELECT * FROM employee, insurance WHERE insurance.id = employee.id AND insurance.isvalid= 1 AND employee.islocal=1
正确答案及解析
正确答案
解析
select的标准语法结构：
select 列名 from 表名 where 条件 group by 分组字段 having 条件 order by 排序字段。
题干中已经说明：isvalid=1表示社保有效；islocal=0 表示不在当地。所以where的条件应该是insurance.isvalid=1 and employee.islocal=0 and insurance.id= employee.id
所以答案为C。
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