Senior Support Executive Interview Questions and Answers

Structure Query Language (SQL) is a standard language for managing and manipulating databases.

• SQL is used to communicate with databases to perform tasks such as querying data, updating records, and creating tables.

• It is a declarative language, meaning users specify what they want to retrieve or modify without needing to specify how to do it.

• Common SQL commands include SELECT, INSERT, UPDATE, DELETE, and CREATE.

• Example: SELECT * FROM employees WHERE department = 'IT';

Aggregate functions are functions in databases that perform a calculation on a set of values and return a single value.

• Aggregate functions are used in SQL queries to perform calculations on groups of rows and return a single result.

• Examples of aggregate functions include SUM, AVG, COUNT, MIN, and MAX.

• These functions are commonly used with the GROUP BY clause to group rows based on a specified column.

Table partitions are a way to divide a large table into smaller, more manageable parts.

• Table partitions help improve query performance by allowing data to be stored and accessed more efficiently.

• Partitions can be based on a range of values (e.g. dates) or a list of values (e.g. regions).

• They can also be used for easier data management, such as archiving old data or isolating specific data for security purposes.

To write a join, use the JOIN keyword followed by the table name and the ON keyword to specify the join condition.

• Use the JOIN keyword to combine rows from two or more tables based on a related column between them

• Specify the join condition using the ON keyword followed by the columns to join on

• Example: SELECT * FROM table1 JOIN table2 ON table1.column = table2.column

Yes, I have a laptop for work purposes.

• Yes, I have a laptop provided by the company for work tasks.

• I use my laptop to communicate with clients, access company systems, and troubleshoot technical issues.

• Having a laptop allows me to work remotely and be more efficient in my role.