How to use the rownumber function in SQL?

2 years ago
Jackson Davis
1 minute

In SQL, the ROW_NUMBER() function is used to assign a unique row number to each row in the result set. Typically used in conjunction with the OVER clause, it can sort rows based on a specified column and assign a unique row number to each row.

Here is an example of using the ROW_NUMBER() function:

SELECT 
    ROW_NUMBER() OVER (ORDER BY column_name) AS row_num,
    column1,
    column2
FROM 
    table_name;

In the example above, the ROW_NUMBER() function is used to assign a unique row number to each row in the query result, and it is sorted based on the specified column. You can modify the ORDER BY clause according to your needs to sort the result set.

Please note that the ROW_NUMBER() function is typically used with an OVER clause to specify the sorting order. The ROW_NUMBER() function does not update actual data in the table, it simply assigns a unique row number to each row in the query result set.

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