Check out example codes for "sql server: query to find out all the places where the table is used". It will help you in understanding the concepts better.

Code Example 1

SELECT DISTINCT
    o.name AS Object_Name,o.type_desc
    FROM sys.sql_modules        m 
        INNER JOIN sys.objects  o ON m.object_id=o.object_id
    WHERE m.definition Like '%WhateverIAmSearchingFor%'

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