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The JVM looks for the public static void main(String[] args) method as the entry point to start running a Java application.

The modulus operator (%) returns the remainder of a division. 10 divided by 3 is 3 with a remainder of 1.

The SUM() function calculates the total of all non-NULL values in a numeric column.

The DROP TABLE statement deletes a table and all its data permanently from the database.

The HAVING clause filters the results of a GROUP BY query based on a condition, unlike WHERE which filters rows before grouping.

COUNT(DISTINCT column) counts only unique values in the specified column, avoiding duplicate counts.

JVM (Java Virtual Machine) is the abstract machine that executes Java bytecode. JRE (Java Runtime Environment) includes the JVM and library classes needed to run Java applications. JDK (Java Development Kit) includes the JRE plus the tools needed to develop Java applications (like the compiler and debugger).

The INNER JOIN keyword selects records that have matching values in both tables. It is the most common type of join.

A LEFT JOIN is appropriate here because you want all customers (the left table) regardless of whether they have a matching record in the orders table (the right table).

A Self Join is a regular join, but the table is joined with itself. This is useful for querying hierarchical data or comparing rows within the same table (e.g., finding employees who have the same manager).

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