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Crucial Exams

CompTIA Data+ DA0-002 (V2) Practice Question

You are writing a cross-platform SQL query against a cloud data warehouse that does not implement either the ANSI concatenation operator (||) or SQL Server's + operator. The platform does support the multi-argument scalar function CONCAT() but not the convenience function CONCAT_WS(). The table employees contains the columns department_code, last_name, and other fields. The report must return a single column named employee_key whose value is the department code, a dash, and the employee's last name in upper-case (for example FIN-SMITH). Which SQL snippet satisfies the requirement without relying on unsupported operators or functions?

  • SELECT department_code || '-' || UPPER(last_name) AS employee_key FROM employees;

  • SELECT department_code + '-' + UPPER(last_name) AS employee_key FROM employees;

  • SELECT CONCAT(department_code, '-', UPPER(last_name)) AS employee_key FROM employees;

  • SELECT CONCAT_WS('-', department_code, UPPER(last_name)) AS employee_key FROM employees;

CompTIA Data+ DA0-002 (V2)
Data Acquisition and Preparation
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