SQL for Business
posted by kat .
By using this table:
CREATE TABLE Part (
Partid int IDENTITY PRIMARY KEY,
Supplierid int NOT NULL
REFERENCES Part (PartID),
Description VARCHAR (25) NOT NULL,
Count int NOT NULL,
Class VARCHAR (5) NOT NULL,
Inspection smalldatetime NOT NULL);
I need to write the following SQL statements: If it helps I am using MS Server 2008.
1- Write a SQL statement that creates a stored procedure with one int input parameter. The stored procedure selects the
supplierId field and the total of all Count field values for each group of supplierId's from the Part table. Only rows with their Count total, or sum, greater than the value specified in the input
parameter should be returned. Hint: Each returned record has a unique SupplierID value, since we are dealing with groups.
2- Write a SQL statement that creates a stored procedure that adds a new record to the Part table, and returns the value of
the newly created PartID PK in an out parameter. The field values of the record to be added should be passed into the
stored proc as input parameters. The assumption here is that the Part table has its PartID PK field as an idendity field,
or surrogate PK, meaning a numeric field that is auto-generated by the db system.
3- Write a SQL statement that creates a user defined function that returns an int value. This int return value is obtained
by subtracting the lowest Count field value from the highest Count field value of the Part table. You could enter dummy
test records in the Part table if you are running/testing this function in SQL Server.
4- Create an Update trigger on the Part table that raises an error string if the Count field of the updated row has a
higher value than the value prior to the Update. In other words, the new value cannot be larger than the older value. If
the trigger fires and after the error string is displayed, the Update operation should be rolled back. The exact text of
the error string is up to you to define.
Which part or concept or keyword are you having problems with?
For the first one I know that I have to the keyword Group By. I just don't know how to set it up. I been trying to find tutorials and examples to help me but they are even more confusing.
OK. Do you have a table to test on? Here's a statement that might get you going:
SELECT Supplierid, SUM(Count)
WHERE Count > PARAMETER
GROUP BY Supplierid
If you just run this against your table, substituting some number in for PARAMETER for now, you should get the expected result.
When you've got comfortable with that, you can code it into a stored procedure.