WISE OWL EXERCISES
SQL EXERCISES
SQL EXERCISES
- Simple Queries (4)
- Setting criteria using WHERE (5)
- Calculations (7)
- Calculations using dates (4)
- Basic joins (8)
- More exotic joins (2)
- Aggregation and grouping (8)
- Views (5)
- Subqueries (5)
- Stored procedures (5)
- Variables (8)
- Parameters and return values (11)
- Testing conditions (1)
- Looping (3)
- Scalar functions (6)
- Transactions (5)
- Creating tables (5)
- Temporary tables and table variables (9)
- Table-valued functions (6)
- Derived tables and CTEs (13)
- Dynamic SQL (4)
- Pivots (2)
- Triggers (2)
- Archived (70)
SQL | Basic joins exercise | Create a query joining two tables together, using aliases
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The answer to the exercise will be included and explained if you attend the course listed below!
| Software ==> | SQL (198 exercises) |
| Version ==> | Any version of SQL Server |
| Topic ==> | Basic joins (8 exercises) |
| Level ==> | Average difficulty |
| Course ==> | Introduction to 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.