Interesting questions about today's century Tiancheng interview

The following questions were asked during the century Tiancheng interview or written examination today. They may only remember some of them, and some seem interesting.

1. What applications does the New Keyword have?

2. What are the differences between interfaces and abstract classes? What are the differences between struct and class?

3. Use an SQL statement to retrieve records 31-40 from a table, primary key ID, auto-increment, but not continuous.

4. Write a function and convert the string "abcdef" to "efcdab"

5. Write a function and convert a = 1, B = 2 to a = 2, B = 1 without using the intermediate variable.

6. UseCodeDescribe a design pattern you are familiar. (Actually one of the 23 modes)

7. Write a function to judge that the input string is composed of digits.

8. What are the differences between left join, right join, and inner join in SQL?

9. What is the role of union in SQL?

10. use ADO. . Net writes data connection and operation statements.

11. What are SQL objects?

There are two more visitsProgramThere are too many codes to remember, mainly Testing Object-Oriented and polymorphism.
Remember so much. There are not many specific mistakes. Let's take a look at it.