Learning how to count and add
In this exercise, you will get familiar with the function used for counting rows and the one that sums up values.
You will select information from the voters table and will calculate the number of female and male voters and the total number of votes for these groups.
Remember, for applying aggregate functions on groups of data, you need to use the GROUP BY statement.
Deze oefening maakt deel uit van de cursus
Functions for Manipulating Data in SQL Server
Oefeninstructies
- Count the number of voters for each group.
- Calculate the total number of votes per group.
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
SELECT
gender,
-- Count the number of voters for each group
___ AS voters,
-- Calculate the total number of votes per group
___ AS total_votes
FROM voters
GROUP BY gender;