Mechlin Technologies Interview Questions and Answers

1st round written test on basic arithmetic questions, english grammar and SQL related questions.
Answers to be marked in question paper for mcqs, and write in additional sheets about SQL queries asked. This test is of 1hr 30 mins. Phones cannot be used so prepare well in advance.

Q1. Self introduction
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Q2. Okay with the SLA
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SLA stands for Service Level Agreement, which outlines the level of service expected from a vendor.
• SLA defines the agreed upon level of service between a provider and a customer.

• It includes metrics like response time, uptime, and resolution time.

• SLAs are important for ensuring accountability and quality of service.

• Example: An SLA might specify that the vendor will respond to support tickets within 24 hours.
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Q1. What is the difference between DDL and DML?
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DDL stands for Data Definition Language and is used to define the structure of database objects. DML stands for Data Manipulation Language and is used to manipulate data within the database.
• DDL is used to create, modify, and delete database objects such as tables, indexes, and views.

• DML is used to insert, update, delete, and retrieve data from database tables.

• Examples of DDL statements include CREATE TABLE, ALTER TABLE...read more
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Q2. How to fetch a employee record with the second highest salary from the employees table?
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Q3. What was one of the trickiest incident you have faced and how did you counter it?
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Q4. How SQL is divided?
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SQL is divided into Data Definition Language (DDL), Data Manipulation Language (DML), Data Control Language (DCL), and Transaction Control Language (TCL).
• Data Definition Language (DDL) - used to define the structure of database objects like tables, indexes, and views. Examples include CREATE, ALTER, DROP.

• Data Manipulation Language (DML) - used to manipulate data stored in the database. Examples include SELECT, INSERT, ...read more
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Q5. How would prepare an emplyees attendance record? Create charts and graphs regarding it.
Ans. 
To prepare an employee's attendance record, I would gather data on their attendance, create charts and graphs to visualize trends and patterns.
• Gather attendance data including dates, times, and reasons for absence or tardiness

• Create a spreadsheet or database to organize the data

• Use software like Excel or Tableau to create charts and graphs showing attendance trends

• Include metrics such as overall attendance rate, late a...read more
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Q6. Difference between SQL and MYSQL
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SQL is a standard language for managing databases, while MySQL is a specific open-source relational database management system.
• SQL is a standard language used to interact with databases, while MySQL is a specific database management system.

• SQL is an ANSI (American National Standards Institute) standard language, while MySQL is an open-source relational database management system.

• SQL can be used with various database ma...read more
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Q7. Define joins using examples.
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Joins are used to combine rows from two or more tables based on a related column between them.
• Joins are used in SQL to retrieve data from multiple tables based on a related column.

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• Example: INNER JOIN retrieves rows from both tables where the join condition is met.

• Example: LEFT JOIN retrieves all rows from the left table and the matched rows ...read more
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