WISE OWL 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 | Archived exercise | Retail orgs or orgs with lots of people
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You can learn how to do this exercise on the relevant Wise Owl classroom training course (sadly for the moment only in the UK).
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If you haven't already done so, run the stored procedure in the above folder to generate a database of training courses and delegates.
We want to create a query which shows all companies which either are in the retail sector or which have more than 12 people working there. To do this, first select all of the companies in the retail sector (there are only 2) into a new temporary table called #Org:
This is what you should have so far
Now add code to insert all companies employing more than 12 people into the same table (you could use a subquery to do this, as shown below):
An example of code to pick out these organisastions
Select all of the records from the temporary table that you've compiled. The final answer should look like this:
Primark and Kingfisher PLC qualify as being part of the retail sector
Optionally, save this query as Retail or big orgs.sql, then close it down.