In SQL, the SELECT statement is used to retrieve data from a database table. Often, you may need to filter the results to include only the rows that have non-null values in a specific column. This can be achieved using the IS NOT NULL condition in your SELECT query.

Here’s an example to demonstrate how to use the IS NOT NULL condition:

SELECT column1, column2 
FROM your_table 
WHERE column1 IS NOT NULL;

In this example, your_table is the name of the table you want to query, column1 and column2 are the columns you want to select from, and IS NOT NULL ensures that only rows with non-null values in column1 are returned in the result set.

You can also use the IS NULL condition to select rows that have null values in a specific column. Here’s an example:

SELECT column1, column2 
FROM your_table 
WHERE column1 IS NULL;

In this case, only the rows with null values in column1 will be included in the result.

By using the IS NOT NULL and IS NULL conditions in your SELECT queries, you can effectively filter and retrieve the data based on the presence or absence of null values in a specific column.

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