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举一反三
【单选题】Examine the structures of the EMPLOYEES and TAX tables. You need to find the percentage tax applicable for each employee. Which SQL statement would you use?（）
A.
SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary BETWEEN t.min_salary AND t.max_salary;
B.
SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE e.salary > t.min_salary, tax_percent
C.
SELECT employee_id, salary, tax_percent FROM employees e, tax t WHERE MIN(e.salary) = t.min_salary AND MAX(e.salary) = t.max_salary
D.
You cannot find the information because there is no common column between the two tables.
【简答题】Homework 1 - Conference Correspondence (5%) (due 13:30, 17 December, 2018) Directions: Find some academic conferences that are relevant to your discipline. These conferences will be held in the upcomi...
【单选题】下列与我国地势有关的说法中正确的是（ ）
A.
所有大河都依地势自西向东流
B.
东海、南海全都是大陆架
C.
昆仑山是地势第一、二级阶梯的分界线
D.
四川盆地位于第三级阶梯上
【单选题】Click the Exhibit button to examine the structures of the EMPLOYEES and TAX tables. You need to find the percentage tax applicable for each employee. Which SQL statement would you use?（）
A.
SELECT employee_id, salary, tax_percent FROM employees e JOIN tax t ON e.salary BETWEEN t.min_salary AND t.max_salary;
B.
SELECT employee_id, salary, tax_percent FROM employees e JOIN tax t WHERE e.salary > t.min_salary AND < t.max_salary;
C.
SELECT employee_id, salary, tax_percent FROM employees e JOIN tax t ON (MIN(e.salary) = t.min_salary AND MAX(e.salary) = t.max_salary);
D.
You cannot find the information because there is no common column between the two tables.
【简答题】Find some academic conferences that are relevant to your discipline. These conferences will be held in the upcoming months in 2019 or 2020. Select one of them to your interest and then email the conta...
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