In Operator Filter — Solution & ExplanationProblems / In Operator Filter / EditorialApproachThe IN operator is a concise way to check membership in a set of values.

WHERE department IN ('Engineering', 'Marketing', 'Finance') keeps only rows matching those three departments.

This is equivalent to: department = 'Engineering' OR department = 'Marketing' OR department = 'Finance'.

IN is cleaner and easier to read than chaining multiple OR conditions.Hints

IN checks if a value matches any item in a list.

The IN list values must be quoted for strings: IN ('A', 'B', 'C').

In PySpark, use .isin() on a column with the values as arguments.

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