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SQL | Basic joins exercise | Create a query joining two tables together, using aliases
This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.
You can learn how to do this exercise if you attend one of more of the courses listed below!
| Software ==> | SQL (198 exercises) |
| Version ==> | Any version of SQL Server |
| Topic ==> | Basic joins (8 exercises) |
| Level ==> | Average difficulty |
| Classroom ==> | Introduction to SQL / Fast-track SQL |
| Online ==> | Introduction to SQL / Fast-track SQL |
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If you haven't already done so, run the script in the folder above to generate the Doctor Who database.
Each episode in the database has assigned to it the doctor who played the starring role:
Each episode is linked to a doctor by the DoctorId column.
Create a join to list out all of the doctors who appeared in episodes made in 2010. As a help, here's the syntax of an inner join:
-- the syntax of a join
SELECT
-- show columns from either the first table ...
alias1.SomeColumn,
-- ... or the second
alias2.AnotherColumn
FROM
-- decide which will be the main table
FirstTable as alias1
-- link to the second table
INNER JOIN SecondTable as alias2
ON alias1.ColumnName1 = alias2.ColumnName2
Use the year function on the EpisodeDate column to get the year in which each episode took place.
When you run your query, you should see that all but one of the 15 episodes made in this year starred Matt Smith:
They were both better than Peter Capaldi, that's for sure ...
Save your query as David and Matt, then close it down.