SQL SELECT NULL

SQL SELECT NULL

When working with databases, handling NULL values is essential. But before we dive into queries, let’s first understand what NULL means in SQL.

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What is NULL in SQL?

NULL values represent missing or unknown data in a table. A column can have NULL values when data is not provided during insertion or updating.

Note: NULL is not the same as 0 or an empty string (“”).

There are two conditions we commonly use in SQL:

1. WHERE column IS NULL → To find records where a specific column has NULL values.
2. WHERE column IS NOT NULL → To find records where a column has actual data (not NULL).

1. WHERE SQL IS NULL

How to select records with NULL values in a specific column?

Let’s consider a STUDENTS table:

To retrieve all records where the MARKS column is NULL, use the following query:

SELECT SIR_NAME, NAME, MARKS FROM STUDENTS  
WHERE MARKS IS NULL;  

Output:

2. WHERE SQL IS NOT NULL

How to select records that do not have NULL values?

To get all the records where MARKS is NOT NULL, use the following query:

SELECT SIR_NAME, NAME, MARKS FROM STUDENTS  
WHERE MARKS IS NOT NULL;  

Output:

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Conclusion

Handling NULL values properly is crucial in SQL. IS NULL helps filter out missing data, while IS NOT NULL ensures only complete records are retrieved.

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