Question

How do I create these SQL Statements?

Asked by: melissa0901

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.

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Asked On
2009-11-01 at 09:53:39ID24862040
Tags

MS Server 2005 and/or 2008

Topics

SQL Server 2008

,

SQL Server 2005

,

Windows 2000 Server

Participating Experts
2
Points
500
Comments
14

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Answers

 

by: melissa0901Posted on 2009-11-01 at 10:13:30ID: 25714668

For the first one I have created this:

CREATE PROCEDURE PART
AS
SELECT Supplierid, SUM (Count)
Where Count>Parameter
GROUP BY Supplierid

 

by: mwvisa1Posted on 2009-11-01 at 10:20:33ID: 25714704

Here is a breakdown of the first question :

  1. Write a SQL statement that creates a stored procedure with one int input parameter.
     
  2. 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.
     
  3. 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.

(just FYI, it is good to break up questions to focus on one thing so you can get more direct answers -- but since you have all four already listed here guess you can take one at a time)


Now looking at the above, you have not satisfied requirement #1 and thus can't satisfy #3.

Just remember :

create procedure your_procedure_name
-- parameters list here
as
-- body of procedure here


Kevin

 

by: angelIIIPosted on 2009-11-01 at 10:23:05ID: 25714715

as a side note: you should repost your question into 4 new questions, and delete this one, as you have 4 topics to cover.

anyhow, for the first part, let's start reading the first sentence:
1- Write a SQL statement that creates a stored procedure with one int input parameter.

where, in your suggested code, is the parameter?
did you read up on the syntax specifications of a sql server stored procedure?

note: you cannot have a table and a stored procedure with the same name.
anyhow, you should name a stored procedure according to it's function..

 

by: mwvisa1Posted on 2009-11-01 at 10:24:25ID: 25714730

by the way,

SELECT Supplierid, SUM(Count)
GROUP BY Supplierid

Is close for getting grouping by supplier id.  You are missing a FROM clause with your table name Part.  Complete syntax to get supplier id and total count would be :

select Supplierid, sum(Count) as TotalCount
from Part
group by Supplierid

That is not a full solution, as want you to learn some of this on your own given it is homework...

 

by: melissa0901Posted on 2009-11-01 at 10:59:41ID: 25714900

This is what I came up with:
CREATE PROCEDURE spSupplier
AS
SELECT Supplierid,SUM(Count)
FROM Part
WHERE Count>5
GROUP BY Supplierid

 

by: angelIIIPosted on 2009-11-01 at 11:10:01ID: 25714934

where is your input parameter?
msdn.microsoft.com/en-us/library/aa258259(SQL.80).aspx

 

by: mwvisa1Posted on 2009-11-01 at 11:10:39ID: 25714939

Okay, you are still not passing a parameter, but before you get to that let's look at what they want you to do with it.

SELECT Supplierid,SUM(Count)
FROM Part
WHERE Count>5
GROUP BY Supplierid


This would eliminate supplier records with count <= 5 from being counted.  
"Only rows with their Count total, or sum, greater than the value specified in the input parameter should be returned."

This statement says to SUM(Count) should be > 5, so you have to apply the filter after the grouping occurs.

Research HAVING clauses:
http://technet.microsoft.com/en-us/library/ms180199.aspx

Research Stored Procedure:
http://msdn.microsoft.com/en-us/library/ms187926.aspx


Kevin

 

by: melissa0901Posted on 2009-11-01 at 11:38:29ID: 25715060

This is what I came up with.  

CREATE PROCEDURE spSuppliers
@Partid int
AS
SELECT Supplierid, SUM(Count)AS TOTALCOUNT
FROM Part
GROUP BY Supplierid

 

by: angelIIIPosted on 2009-11-01 at 11:44:52ID: 25715090

1 step completed...
now, you need to use the parameter variable in the query itself...   see code snippet.

next step: add a condition for the "totalcount" > 5...
tip: it is NOT in the WHERE clause...
http://technet.microsoft.com/en-us/library/ms177673.aspx

CREATE PROCEDURE spSuppliers
@Partid int
AS
SELECT Supplierid, SUM(Count)AS TOTALCOUNT
FROM Part
WHERE Partid = @partId
GROUP BY Supplierid

                                              
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by: melissa0901Posted on 2009-11-01 at 22:10:23ID: 25717335

I have created this:
CREATE PROCEDURE spSuppliers
@Partid int
AS
SELECT Supplierid, SUM(Count) AS TOTALCOUNT
FROM Part
WHERE Partid=@partid
GROUP BY Supplierid

Now I have to add a condition for the totalcount which is in the GROUP BY. This is what I have tried but when I try to execute it in MS Server 2008 it comes up with errors:

GROUP BY Supplierid  = TOTALCOUNT>5
GROUP BY Supplierid, TOTALCOUNT>5
GROUP BY Supplierid>5

 

by: angelIIIPosted on 2009-11-01 at 22:13:45ID: 25717353

they correct keyword is HAVING:

CREATE PROCEDURE spSuppliers
@Partid int
AS
SELECT Supplierid, SUM(Count) AS TOTALCOUNT
FROM Part
WHERE Partid=@partid
GROUP BY Supplierid
HAVING SUM(Count) > 5

                                              
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by: melissa0901Posted on 2009-11-01 at 22:17:20ID: 31648592

Thanks for all your help.

 

by: mwvisa1Posted on 2009-11-02 at 05:32:50ID: 25719079

Glad we could help.  Try out steps 2-4 individually and post questions as needed.

Good luck.

Best regards and happy coding,
M-1

20120131-EE-VQP-002

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