SQL LEARNING SERIES PART-20

Complete SQL Topics for Data Analysis
-> https://t.me/sqlspecialist/523

Let's discuss on how to Handle NULL Values in SQL today:
(Pretty much important topic)

Dealing with NULL values is a common aspect of SQL, and understanding how to handle them is crucial for accurate data analysis.

#### IS NULL and IS NOT NULL:
- Use the IS NULL condition to filter rows with NULL values.

SELECT column1, column2 FROM table_name WHERE column3 IS NULL;

- Use the IS NOT NULL condition to filter rows without NULL values.

SELECT column1, column2 FROM table_name WHERE column3 IS NOT NULL;

#### COALESCE Function:
- Replace NULL values with a specified default value.

SELECT column1, COALESCE(column2, 'DefaultValue') AS modified_column FROM table_name;

#### NULLIF Function:
- Set a column to NULL if it matches a specified value.

SELECT column1, NULLIF(column2, 'UnwantedValue') AS modified_column FROM table_name;

Handling NULL values appropriately ensures accurate and reliable results in your queries.

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Hope it helps :)