I need to move the position of existing columns (for better visibility).
How can this be done without affecting the data?
Here is the sql query
ALTER TABLE table_name MODIFY COLUMN misplaced_column Column-definition AFTER other_column;
Here in Column-definition is full column definition. To see the column definition if you are using phpmyadmin click on structure tab. Then click on change link on desired column. Then withour modifyig any things click save. It will show you the sql. Copy the sql and just add *AFTER other_column* at the end. It will be all.
If you like to bring the *misplaced_column* to the first position then ALTER TABLE table_name MODIFY COLUMN misplaced_column Column-definition FIRST;
However, It seems it is a duplicate question.