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)
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- Subqueries (3)
- Stored procedures (5)
- Variables (8)
- Parameters and return values (11)
- Testing conditions (1)
- Looping (3)
- Scalar functions (6)
- Transactions (4)
- Creating tables (4)
- Temporary tables and table variables (9)
- Table-valued functions (6)
- Derived tables and CTEs (11)
- Dynamic SQL (4)
- Pivots (2)
- Triggers (2)
- Archived (70)
SQL | Transactions exercise | Add Shaun the Sheep as a new doctor within a transaction
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.
The answer to the exercise will be included and explained if you attend the course listed below!
| Software ==> | SQL (192 exercises) |
| Version ==> | Any version of SQL Server |
| Topic ==> | Transactions (4 exercises) |
| Level ==> | Relatively easy |
| Course ==> | Advanced SQL |
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First (if you haven't already done so) run the script shown above to generate the Doctor Who training database.
Write a query to add Shaun the Sheep as Doctor Who number 13 in the tblDoctor table, but first begin a transaction:
-- this should go within a transaction
INSERT INTO tblDoctor(
DoctorName,
DoctorNumber
) VALUES (
'Shaun the Sheep',
13
)
Extend this query (without running it yet) so that it:
- Tests to see whether 2 + 2 = 4;
- Rolls back the transaction if this is true; or
- Commits it if this is false.
Use the SQL syntax IF ... ELSE ....
Finally, display a list of all of the doctors (the rows from the tblDoctor table). Now run your query - it should show the original 12 doctors (Shaun the Sheep has not beeen added).
Amend your query to test whether 2 + 2 = 5, and rerun it. You should now get your new doctor:
The transaction has been committed, and the new doctor appears in the list.
Manually delete this added row, then (optionally) save this query as Baad example.sql and close it down.