Creating CTEs (I)
A Common table expression or CTE is used to create a table that can later be used with a query. To create a CTE, you will always use the WITH keyword followed by the CTE name and the name of the columns the CTE contains. The CTE will also include the definition of the table enclosed within the AS().
In this exercise, you will use a CTE to return all the ages with the maximum BloodGlucoseRandom in the table.
This exercise is part of the course
Intermediate SQL Server
Exercise instructions
- Create a CTE
BloodGlucoseRandomthat returns one column (MaxGlucose) which contains the maximumBloodGlucoseRandomin the table. - Join the CTE to the main table (
Kidney) onBloodGlucoseRandomandMaxGlucose.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
-- Specify the keyowrds to create the CTE
___ BloodGlucoseRandom (MaxGlucose)
___ (SELECT MAX(BloodGlucoseRandom) AS MaxGlucose FROM Kidney)
SELECT a.Age, b.MaxGlucose
FROM Kidney a
-- Join the CTE on blood glucose equal to max blood glucose
JOIN BloodGlucoseRandom b
___