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23,007 Pointssql help do i need to use the group by key word
Write a query to figure out how many employees are in each job role.
SELECT JOBS.ROLE, COUNT(1) FROM EMPLOYEES JOIN JOBS ON EMPLOYEES.JOB_ID = JOBS.ID ;
1 Answer
Billy Bellchambers
21,689 PointsGroup by is used as the name suggests to group values by a specific column value.
In this example it wants to do a count of the number of records against each value of Jobs.Role
To achieve this you can do the following.
SELECT JOBS.ROLE, COUNT(1)
FROM EMPLOYEES
JOIN JOBS ON EMPLOYEES.JOB_ID = JOBS.ID
GROUP BY JOBS.ROLE;
Should you want some further detail on the GROUP BY statement. https://www.w3schools.com/sql/sql_groupby.asp