Code three tests: 1) for a student who has courses 2) for student who does not have courses 3) a non-existing student ID. For each test, display the value of the student ID that was passed to the function and the result returned by the function. Also, run a supportive SELECT query or queries that prove the test results are correct.

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Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.