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HCLTech
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I applied via Recruitment Consulltant and was interviewed before Jul 2022. There were 3 interview rounds.
Delete removes rows one by one and can be rolled back, while truncate removes all rows at once and cannot be rolled back.
Delete is a DML command, while truncate is a DDL command.
Delete operation is slower as it generates a lot of undo and redo logs, while truncate is faster.
Delete can have a WHERE clause to specify which rows to delete, while truncate removes all rows in a table.
Delete can be rolled back using ROLLBACK...
Different types of joins in SQL include inner join, left join, right join, and full outer join.
Inner join: Returns rows when there is a match in both tables.
Left join: Returns all rows from the left table and the matched rows from the right table.
Right join: Returns all rows from the right table and the matched rows from the left table.
Full outer join: Returns rows when there is a match in either table.
To delete duplicate records, use SQL queries with DISTINCT keyword or create a unique index on the table.
Use SQL queries with DISTINCT keyword to select unique records and insert them into a new table
Create a unique index on the table to prevent duplicate entries in the future
Use DELETE statement with a subquery to remove duplicate records from the table
To find the nth highest salary, we can use a SQL query with the ORDER BY and LIMIT clauses.
Use a SQL query with ORDER BY and LIMIT clauses to sort the salaries in descending order and retrieve the nth highest salary.
For example, to find the 3rd highest salary in a table named 'employees', the query would be: SELECT DISTINCT salary FROM employees ORDER BY salary DESC LIMIT 2, 1
Primary key uniquely identifies each record in a table, while a unique key ensures that all values in a column are distinct.
Primary key is a combination of unique and not null constraints
Primary key can only be one per table
Unique key can have multiple per table
Example: Primary key - employee_id, Unique key - email
Yes, I am comfortable with 24x7 support as I understand the importance of continuous support in a fast-paced environment.
I am willing to work in shifts to provide round-the-clock support
I have experience working in a similar role with 24x7 support requirements
I understand the importance of timely response and resolution of issues in a 24x7 support setup
What people are saying about HCLTech
posted on 25 Feb 2025
The difficulty level of the test is relatively easy.
I was interviewed in Aug 2024.
Ask about basic maths , logical reasoning
I have 5 years of experience working as a Process Specialist in the manufacturing industry.
Managed process improvement projects to increase efficiency and reduce waste
Developed and implemented standard operating procedures for production
Trained staff on new processes and procedures
Collaborated with cross-functional teams to identify and solve process issues
posted on 10 Jan 2025
I applied via Recruitment Consulltant and was interviewed in Dec 2024. There was 1 interview round.
I plan to work here for the foreseeable future, as I am excited about the opportunities for growth and development within the company.
I am committed to contributing to the success of the team and the organization
I see potential for advancement and learning opportunities within the company
I am excited about the projects and initiatives currently in progress at the company
I applied via Referral
We were given a scenario where client and Admin was in discussion. basically, client was bit rude, and Admin was supposed to handle him carefully so that it will not cause adverse impact over the business.
based on 1 interview
Interview experience
based on 1 review
Rating in categories
Software Engineer
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| ₹7 L/yr - ₹28 L/yr |
Senior Software Engineer
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| ₹4 L/yr - ₹16.6 L/yr |
Lead Engineer
14.9k
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| ₹4.2 L/yr - ₹14 L/yr |
Analyst
14.3k
salaries
| ₹0.8 L/yr - ₹6.5 L/yr |
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