Where can I practice SQL queries for interview?

SQLPad gives you everything you need to succeed in a SQL interview. Watch, learn and practice SQL all in your browser. Every SQL question is thoughtfully designed within a business context. One-stop-shop to improve your SQL skills to a whole new level.

What are the interview questions for SQL queries?

SQL Interview Questions

• What is SQL?
• What is a database?
• Does SQL support programming language features?
• What are the differences between SQL and PL/SQL?
• What is the difference between BETWEEN and IN operators in SQL?
• Write an SQL query to find names of employees start with ‘A’?

How do you write SQL queries?

How to Create a SQL Statement

1. Start your query with the select statement. select [all | distinct]
2. Add field names you want to display. field1 [,field2, 3, 4, etc.]
3. Add your statement clause(s) or selection criteria. Required:
4. Review your select statement. Here’s a sample statement:

How do you write a good SQL query?

1. Provide Correct Formatting for the Query.
2. Specify the SELECT fields instead of using SELECT *
3. Remove Correlated Subqueries if not required.
4. Limit the results obtained by the query.
5. Remove The DISTINCT Clause if not required.
6. Avoid Functions in Predicates.
7. Avoid OR, AND, NOT operators if possible.

How can I make SQL easier to read?

10 Best Practices to Write Readable and Maintainable SQL Code

1. Use Uppercase for the Keywords.
2. Use Snake Case for the schemas, tables, columns.
3. Use aliases when it improves readability.
4. Formatting: Carefully use Indentation & White spaces.
5. Avoid Select *
6. Go for the ANSI-92 JOIN Syntax.
7. Use Common Table Expression (CTE)

How do I write beautiful queries in SQL?