Alert Against invisible tabs in the database

I wrote a stored procedure yesterday and used select to retrieve data. However, the instructor missed some data and the SQL statement was completely correct. Some data was lost, so I was puzzled. Later, at the guidance of a master, some data in the database contains invisible tabs. It is precisely because of these tabs that the SELECT statement cannot retrieve the correct records. After the database is updated, the problem is solved.

Problem: The SELECT statement does not properly filter the required data and data is lost.

Cause: the fields in the database contain invisible tabs.

Solution: update the data in the database and remove invisible tabs.