Syntax error in views: When creating a view, syntax errors may occur, resulting in an invalid view. Common syntax errors include misspelling table names, column names, missing necessary keywords, etc.
The table that the view relies on no longer exists or has been deleted: If the table that a view depends on is deleted after the view is created, or if the table name is changed, the view will become invalid.
View is using a non-existent column: If a view is using a column that does not exist in the table or if the column name is changed, then the view will become invalid.
The view contains invalid functions or stored procedures: If invalid functions or stored procedures are used in the view, the view will be invalid.
Permission issue with views: The user creating the view may not have sufficient permissions to access the tables or columns that the view is dependent on, resulting in the view being invalid.
The creation of a view will fail if the tables or columns it depends on are locked by another session.
