Raghavendra Rail Infrastructure Interview Questions and Answers

Real estate sales offer a dynamic and challenging environment with unlimited earning potential.

• Real estate is a constantly evolving industry with new challenges and opportunities every day.

• The earning potential in real estate sales is virtually unlimited, with commissions based on the value of the properties sold.

• Working in real estate sales allows for a flexible schedule and the ability to work independently.

• Real esta...read more

A structured approach to work enhances efficiency, collaboration, and project success.

• Define clear objectives: Establish what needs to be achieved, e.g., project milestones.

• Plan and prioritize tasks: Use tools like Gantt charts to visualize timelines.

• Collaborate effectively: Regular team meetings to discuss progress and challenges.

• Monitor progress: Use KPIs to track performance and make adjustments as needed.

• Review and...read more

DELETE is used to remove rows from a table, while DROP is used to remove entire tables from a database.

• DELETE is a DML command used to remove specific rows from a table based on a condition.

• DROP is a DDL command used to remove entire tables, views, or databases from a database.

• DELETE does not remove the table structure, only the data within it.

• DROP removes the table structure along with all its data, and it cannot be r...read more

Primary Key in SQL is a unique identifier for each record in a table.

• Primary Key ensures each record in a table is unique

• It can consist of one or multiple columns

• Primary Key values cannot be NULL

• Example: 'id' column in a 'users' table

UNION combines and removes duplicates, UNION ALL combines without removing duplicates.

• UNION merges the result sets of two or more SELECT statements, removing duplicates.

• UNION ALL merges the result sets of two or more SELECT statements, including duplicates.

• UNION is slower than UNION ALL as it involves removing duplicates.

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FROM t

The LIKE operator is used in SQL to search for a specified pattern in a column.

• The LIKE operator is used with the WHERE clause to search for a specified pattern in a column.

• It allows for the use of wildcards such as % (matches any sequence of characters) and _ (matches any single character).

• For example, 'SELECT * FROM table_name WHERE column_name LIKE 'a%'' will return all rows where the column starts with 'a'.