How to fix the error with mysql query rownum?

In MySQL, there is no built-in rownum function that can be directly used. Rownum is a pseudocolumn used in Oracle databases to generate row numbers.

If you use ‘rownum’ in MySQL, you will receive the error message “Unknown column ‘rownum'”.

If you want to generate row numbers in MySQL, you can use the ROW_NUMBER() window function to achieve this. Here is an example of using the ROW_NUMBER() function to generate row numbers:

SELECT ROW_NUMBER() OVER (ORDER BY column_name) AS rownum, column_name
FROM table_name;

In the example above, “column_name” is the name of the column used for sorting, and “table_name” is the name of the table being queried. This will return a result set including line numbers and other columns.

Please note that the ROW_NUMBER() function is only available in MySQL 8.0 and above. If your MySQL version is below 8.0, you may consider using other methods to generate row numbers, such as using an auto-increment primary key column or variables.