[software implementation series] software implementation interview questions with SQL joint query diagram

Interview questions about software implementation engineers , I have also summarized some , For reference only . We need to improve the mainstream database Oracle、MySQL、SQLserver And domestic databases DM Know something about , And can skillfully deploy and use . It's better to have some knowledge of servers ,windous and linux Should have , You can have fun linux That's definitely a bonus .

To be honest, the software implementation industry , Not only is the information currently lacking , And there is also a shortage of talents . Previously engaged in Javaweb The backend development , Later, it turned to the software implementation industry , Know that this industry is very short of people . At present, I also have on-site implementation experience of several projects , I have also dealt with many people . About the interview , The problem is also similar . If it's the medical industry , Maybe the one that uses Microsoft is more . More attention is paid to the temporary adaptability and SQL Ability to use , As well as the cycle estimation and control of the implementation and control of the project .

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One 、 Software implementation Interview professional skills test questions

1、 As a software implementation engineer, what are your responsibilities ? What kind of ability does this position need ?
answer ： Promote the company's products , Install on site for customers . Familiar with the company's products , Train customers on site .

2、 What are the familiar remote methods ? How should various methods be configured ?
answer ：Windows： common QQ Remote desktop , Or use QQ Office Edition TIM. Or take software with remote desktop function , Or other OA Office system . Finally achieve the desired goal , Use remote assistance to meet customer needs .

win10 There is also the self-contained remote desktop

Open remote desktop assistance

Shortcut key win + r Open task input mstsc Command to open remote desktop .

linux Use ssh Remote connection ：

• Xshell（ The personal version is free to use ）;
• SecureCRT;
• Putty（ free ）;
• tabby（ Open source multi terminal collection ） wait , As long as it can be realized ssh Connected terminal tools .
  

File transfer tool ：WinSCP-5.11.2-Setup.

3、 In the process of your implementation , A software system made by the company lacks a certain function , And the company also made it clear that it would not make any changes or add any functions to the system , And customers insist on this function ! For implementers , How to deal with this problem reasonably and properly ?

answer ：a、 First, let's see whether the user's requirements are reasonable , If it is unreasonable, resolutely return the demand , If the demand is reasonable , You can apply for secondary development , Need to consider the interests of the company .
b、 And then comprehensively consider the heavyweight of customers , Emphasize contract costs to customers , In addition, the human and material resources required for a certain function need to pay extra costs .
c、 Finally, consider third-party software subsidies .

4、 For example, there is a foreign customer in the sales contract , The implementation personnel are required to complete all project implementation within one week at the customer's site , The implementation of the standard usually lasts for one month , How should the implementation personnel deal with the above situation ?
answer ：a、 The implementation of the standard is one month , Then act according to the signed contract .
b、 Then consider completing the project in a week , Is it feasible under the current labor and time costs .
c、 If you want to speed up the progress, you can communicate with the company , Extra personnel , Negotiate additional labor costs with customers .

5、 During the implementation of the project , Users put forward modification suggestions for the products that are suitable for their own habits , But multiple users contradict each other , How to deal with ?
answer ： Adopt the method of seeking common ground while reserving differences . Opinions of customers , Our implementers should have their own implementation plan . When users disagree , Guide the internal opinions of customers to reach unity and communicate with users after confirmation , Find a practical solution , Both parties recognize and reach a consensus .

6、 After system startup , Can't connect to database , What are the possible reasons ?
answer ：a、 Check the network reasons ;b、 Check if the database service starts ;c、 Whether the database file is damaged ;d： Database port number problem （ Whether the firewall is unblocked ）

7、 If there's a client who doesn't know much about computers , What method should you take to teach him to use the company's software products ?
answer ： First, teach customers to be familiar with basic computer operation , Then refer to relevant documents for operation , Actually, teach customers to be familiar with the company's products according to the complexity of the software . Follow from easy to difficult , Simply, it can directly teach customers to be familiar with the use . The complicated step by step is jio print .
You can also make other supplements ：a、 Make ppt;b、 Graphic operation document ;c、 record video .

8、 For existing 5 Over years of customers , How can the historical data generated be processed ?
answer ： Comprehensively consider the heavyweight of customers ,5 If an old customer of more than years is a marginal customer , The data will not be saved for a long time ; Heavyweight customers , Plan ahead , Back up user data . All from the interests of the company .

9、 If the general database log is full , What happens , Whether it can still be used ?
answer ： Only query and other read operations can be performed . Modification cannot be performed , Backup and other write operations , The reason is that any write is logged . The database needs to carry read and write operations , In other words, it is basically in an unusable state .

10、 It is known that A、B The two tables A.id=B.yAId Please write the internal and external links respectively sql sentence , And explain the difference ?
answer ： Internal connection key inner join on; External connection keyword ：left join on,right join on. The inner connection takes A and B The intersection common part of . The external connection is divided into left external connection and right external connection , The left outer connection is dominated by the left table , The right external connection is dominated by the right table . Refer to the below , Think more clearly with the idea of mathematical set .

Be careful ： External connection can be omitted outer Keywords , for example ： The left outer join left outer join Shorthand for left join, The right outer connection is the same , Back fit on keyword .

Two 、SQL Joint query diagram in

1、 Internal connection

Internal connection ：

inner join on

2、 The left outer join

The left outer join ： Omit outer, The same below .

left join on

3、 Right connection

Right connection ：

right join on

Associated queries include 6 Kind of , Two commonly used , Internal and external connections . Internal connections are used more in personal work , The details depend on the work . No details here , There are many online tutorials , You can refer to .

4、 Reference material

Rookie tutorial through train ：
https://www.runoob.com/mysql/mysql-join.html

Interviewed several recruitment software implementation , Basically, the first few written questions are to consider your on-site adaptability , The last few written examination questions are to consider your right SQL The use of , Most of the questions in this aspect of association query . Software implementation usually needs to be stationed in a fixed place , You need to have your own plan . It also needs to be combined with the actual situation of the site , Flexible use . This industry needs long-term accumulated industry experience , It's not done overnight .

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