Exela Technologies Interview Questions, Process, and Tips

SQL is a programming language used for managing and manipulating relational databases.

• SQL stands for Structured Query Language.

• It is used to communicate with and manipulate databases.

• SQL can be used to create, modify, and retrieve data from databases.

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

• SQL is widely used in web development and data analysis.

Joins are used to combine data from two or more tables based on a related column between them.

• Types of joins include inner join, left join, right join, and full outer join.

• Inner join returns only the matching rows from both tables.

• Left join returns all rows from the left table and matching rows from the right table.

• Right join returns all rows from the right table and matching rows from the left table.

• Full outer join re...read more

A cursor is a database object used to manipulate data in a result set.

• A cursor allows you to iterate through a result set one row at a time.

• It can be used to update or delete specific rows in a result set.

• There are two types of cursors: static and dynamic.

• Example: DECLARE cursor_name CURSOR FOR SELECT * FROM table_name;

• Example: OPEN cursor_name; FETCH NEXT FROM cursor_name INTO variable_name;

To find the second highest value in a table, we can use the ORDER BY and LIMIT clauses in SQL.

• Write a SQL query to select all values from the table in descending order

• Use the LIMIT clause to select the second row

• Retrieve the value from the column containing the values