How to use where in in oracle

The WHERE IN clause is used in Oracle to check whether the column value is in a specific value list: Syntax: WHERE column_name IN (value1, value2, ..., valueN) Subquery: WHERE IN subquery can be used Query to get a list of values. Multiple values: WHERE IN checks for multiple values. NULL values: WHERE IN checks for NULL values. Example: Query departments with id 10, 20 or 30 SELECT * FROM departments WHERE id IN (10, 20, 30)

WHERE in Oracle IN Usage

WHERE IN clause is used to check whether the value of a column is in the specified list of values. The syntax is:

WHERE column_name IN (value1, value2, ..., valueN)

Usage

• ##Subquery: WHERE IN You can use a subquery to get a list of values. For example:

  WHERE id IN (SELECT id FROM other_table)

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• Multiple values: WHERE IN can check multiple values. For example:

  WHERE name IN ('John', 'Mary', 'Bob')

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• NULL value: WHERE IN can check for NULL value. For example:

  WHERE age IN (25, 30, NULL)

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Example

SELECT * FROM departments
WHERE id IN (10, 20, 30)

SELECT * FROM employees
WHERE name IN ('John', 'Mary', 'Bob')

Notes

The WHERE IN clause can check a large number of values, but may affect performance.
• If the list of values ​​is very long, consider using an EXISTS or NOT EXISTS subquery.
• The WHERE IN clause cannot be used to check text or LOB data types.

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