Is the following query returns the output? What is the difference between the WHERE and HAVING clauses?What is SQL? When SQL appeared?  What are the usages of SQL?Does SQL support programming language features? What are the subsets of SQL? What is the purpose of DDL Language? What is the purpose of DML Language? What is the purpose of DCL Language?What are tables and fields in the database? What is a primary key? What is a foreign key? What is a unique key? What is the difference between a primary key and a unique key? What is a Database? What is meant by DBMS? What are the different types of database management systems? What is RDBMS? What is Normalization in a Database? What is the primary use of Normalization?What are the disadvantages of not performing database Normalization?What is an inconsistent dependency? What is Denormalization in a Database?What are the different types of SQL operators? What is a view in SQL? What is an Index in SQL? What are the different types of indexes in SQL? What is the unique index? What is clustered index in SQL? What is the non-clustered index in SQL?What are the differences between SQL, MySQL, and SQL Server? What is the difference between SQL and PL/SQL? Is it possible to sort a column using a column alias? What is the difference between clustered and non-clustered indexes in SQL? What is the SQL query to display the current date?  Which are joins in SQL? Name the most commonly used SQL joins? What are the different types of joins in SQL? What is INNER JOIN in SQL? What is the Right JOIN in SQL? What is Left Join in SQL? What is Full Join in SQL? What is a "TRIGGER" in SQL? What is self-join and what is the requirement of self-join? What are the set operators in SQL?What is the difference between IN and BETWEEN operators? What is a constraint? Tell me about its various levels. How to write an SQL query to find students' names start with 'A'? Write the SQL query to get the third maximum salary of an employee from a table named employees. What is the difference between DELETE and TRUNCATE statements in SQL? What is the ACID property in a database? Is a blank space or zero the same as a NULL value? What are functions and their usage in SQL? What is meant by case manipulation functions? Explains its different types in SQL. Explain character-manipulation functions? Explains its different types in SQL. What is the usage of the NVL() function? Which function is used to return remainder in a division operator in SQL? What are the syntax and use of the COALESCE function? How do we use the DISTINCT What is the default ordering of data using the ORDER BY clause? How could it be changed?