如何使用区间来计算sql的日期范围?

I have a two tables in one table I have a column contravention date and in other table i have NTO date column now I want to find how can I retrieve data from tables where NTOdate is greater than 50 days of contravention date. but when I run this query i get error as Incorrect syntax near '50'.I have a two tables in one table I have a colum