Question: Define Comparison Operators, Single-Row Functions, Cartesian Products, Grouping, and Checking Roles Granted to a User. Then, select only one and explain the importance of that

Define Comparison Operators, Single-Row Functions, Cartesian Products, Grouping, and Checking Roles Granted to a User. Then, select only one and explain the importance of that SQL statement/ function in the database environment. Please provide examples and any supporting references.

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