in the final project of SQL in DATA SCIENCE path,
I really don’t understand what is " rv " at the 9th and 15th line
I searched the web and found nothing relevant . Does anybody have any idea about this mysterious thing?
SELECT active_patients.Name AS Name, round(LDL) AS LDL, active_patients.Address AS Address, active_patients.Phone AS Phone FROM panels, (SELECT Borderline_High, High FROM recommended_values WHERE Lipid = "LDL") rv JOIN active_patients ON panels.patient_ID = active_patients.ID GROUP BY LDL, active_patients.Name HAVING LDL >= rv.Borderline_High ORDER BY LDL DESC;