What Kind Of Constraint-restriction I Need To Apply, And How To
May 22, 2008
Hello
I have the following table, and i need to know, what kind of Constraint-restriction and how to apply using management studio for the next case
Table ITEMSProperties
===============================================================================
ItemID (PK-FK) ValueType (PK-FK) PropertyValue (NVARCHAR)
-----------------------------------------------------------------
1 1 (1=Color) Red
1 2 (2=Date) 01/01/2001
2 1 Blue
2 2 021/badStr/08badstr
Well, so ..
If I don€™t want bad Dates-Strings stored in this table, for the ValueType = 2, .. What kind of constraint-restriction or maybe a trigger, I need to use and please tell me how to aplly using management studio ?
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Feb 7, 2008
Hello all,
First of all I would like to show my satisfaction at this great forum.
I'm quite a beginner at SQL and would like to ask a question.
Let's say I have a table of Students and a table of Subjects with their respective details. Now I want to create another table that references both the previous tables so that I would know what subjects the Student is attending. My problem is how to put a restriction in the new table on the number of subjects that each student can have (e.g. each student can only apply for 8 subjects, not more).
I've heard about triggers and other possible solutions, but it's too advanced for me at the moment, so I'd like to possible find a solution through the new table.
Roughly, I guess the new table (let's call it StudentAttends) will have the student id from the Students table and the subject id from the Subjects table. Now how should I add the above restriction?
Thanks for your help!
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Mar 2, 2007
how can i apply unique cosntraint in an existing table's column
i want to do it like this as below
sql server enterprise manager ==> DB==>table (R.click)==>design table
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Nov 27, 2007
Hi... I'm reading the MS Press 70-442 Self-Paced Training kit, and I'm having problems with this example.
I'd like help getting it to work correctly, or understand why it is isn't working the way I planned.
On page 67, the lab is about the APPLY operator (CROSS APPLY and OUTER APPLY). I first have to input a sample table-valued function into the AdventureWorks database:
Code Block
CREATE FUNCTION fnGetAvgCost(@ProdID int)
RETURNS @RetTable TABLE (AvgCost money)
AS
BEGIN
WITH Product(stdcost)
AS
(
SELECT avg(standardcost) as AvgCost
FROM Production.ProductCostHistory
WHERE ProductID = @ProdID
)
INSERT INTO @RetTable
SELECT * FROM Product
RETURN
END
and then run a sample T-SQL statement
Code Block
SELECT p.Name, p.ProductNumber,
Convert(varchar, cost.AvgCost,1) AS 'Average Cost'
FROM Production.Product p
CROSS APPLY fnGetAvgCost(p.ProductID) AS cost
WHERE cost.AvgCost IS NOT NULL
ORDER BY cost.AvgCost desc
My problem is with the WHERE clause... According to page 56, CROSS APPLY returns only rows from the outer table that produces a result set, so why do I need to explicitly filter NULL values?
When I remove the WHERE clause, the query retrieves lots of NULL AvgCost values.
Again, according to page 56, it is the OUTER APPLY that returns all rows that return a result set and will include NULL values in the columns that are returned from the table-valued function.
So, in short, I don't see the difference between CROSS APPLY and OUTER APPLY, using this example, when I remove the WHERE clause?
(Please refrain from introducing another example into this question.)
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Jul 20, 2005
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We will be installing SQL for Workgroups this week.
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May 13, 2008
Hi, all.
I am trying to create table with following SQL script:
Code Snippet
create table Projects(
ID smallint identity (0, 1) constraint PK_Projects primary key,
Name nvarchar (255) constraint NN_Prj_Name not null,
Creator nvarchar (255),
CreateDate datetime
);
When I execute this script I get following error message:
Error source: SQL Server Compact ADO.NET Data Provider
Error message: Named Constraint is not supported for this type of constraint. [ Constraint Name = NN_Prj_Name ]
I looked in the SQL Server Books Online and saw following:
CREATE TABLE (SQL Server Compact)
...
< column_constraint > ::= [ CONSTRAINT constraint_name ] { [ NULL | NOT NULL ] | [ PRIMARY KEY | UNIQUE ] | REFERENCES ref_table [ ( ref_column ) ] [ ON DELETE { CASCADE | NO ACTION } ] [ ON UPDATE { CASCADE | NO ACTION } ]
As I understand according to documentation named constraints should be supported, however error message says opposite. I can rephrase SQL script by removing named constraint.
Code Snippet
create table Projects(
ID smallint identity (0, 1) constraint PK_Projects primary key,
Name nvarchar (255) not null,
Creator nvarchar (255),
CreateDate datetime
);
This script executes correctly, however I want named constraints and this does not satisfy me.
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May 13, 2008
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But the only PK on this table is RegTitleID.
The table structure is:
[RegTitleID] [int] IDENTITY(1,1) NOT NULL,
[RegTitleNumber] [int] NOT NULL,
[RegTitleDescription] [varchar](200) NOT NULL,
[FacilityTypeID] [int] NOT NULL,
[Active] [bit] NOT NULL,
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Has anyone else experienced this?
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I'm not looking for details or code, just general direction I should go. Here is my goal:
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This txt file will then be needed to be saved and emailed.
Also, I would like to be able to schedule this in the Task Scheduler for once a month execution.
Is this all just one big crazy idea?
Thanks for any help.
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Aug 8, 2001
i want to take 70-028 test.
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(NY1-----T1-----NY2)-----56kbps-----(Seattle-----T1-----SanFrancisco-----T1-----Los Angeles)
NY1=NewYork1,NY2=NewYork2,SF=SanFrancisco,LA=Los Angeles
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B.NY1=pubs; NY2=dist;Seattle,SF,LA as subscriber
C.NY1=pubs; SF=subs/dist/pubs; NY2,Seattle,LA as subscriber
D.NY1=pubs; LA=dist; something not workable
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How to do the questions like this?
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Sep 18, 2002
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Jun 11, 2007
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Aug 3, 2007
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Oct 28, 2004
Hi,
I have a problem in a Stored Procedure SQL query im writing, basically what I want is something that works like this
WHERE intField IN (@strCommaSepList_Of_Integers)
First I tried this:
SELECT idComp_Clie_Bran_User, strComp_Clie_Bran_User_FirstName, strComp_Clie_Bran_User_Surname
FROM dbo.tblComp_Clie_Bran_Users
WHERE (fk_idCompany = @fk_idCompany) AND (fk_idComp_Client = @fk_idComp_Client) AND (fk_idComp_UserGroup IN (@strListUserGroupsAllowed))
But if I passed a 25,26 value to the last paramenet is gave an error saying:
Syntax error converting the varchar value '25,36' to a cllumn of data type int.
How can I get this to work??
If for example I manually put the WHERE IN values it works, ike this I mean:
SELECT idComp_Clie_Bran_User, strComp_Clie_Bran_User_FirstName, strComp_Clie_Bran_User_Surname
FROM dbo.tblComp_Clie_Bran_Users
WHERE (fk_idCompany = @fk_idCompany) AND (fk_idComp_Client = @fk_idComp_Client) AND (fk_idComp_UserGroup IN (25, 36))
But thats no use as I have to pass the list of values dynamically...
Please help!!
- Carl
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Feb 22, 2001
Hi,
I am unable to understand how can I create a new filegroup?
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Jul 15, 2004
Here's a basic overview of my Table
ID identity int
ParentID int
Name varchar
Now, the root level items will have a ParentID of NULL, and the child nodes will have it's parent's ID in it's ParentID column (a simple self-referencing relationship).
However, when I select it, I would like to Order by ID, but then have all it's children right after it. For example, if this is the unsorted view:
Code:
ID ParentID Name
----------------------
1 <NULL> Test
2 1 Test Child 1
3 <NULL> Test 2
4 1 Test Child 2
5 3 Test 2 Child 1
I would like the sorted to look like:
Code:
ID ParentID Name
----------------------
1 <NULL> Test
2 1 Test Child 1
4 1 Test Child 2
3 <NULL> Test 2
5 3 Test 2 Child 1
Is this possible with my current structure? If not, how could I change it?
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Jul 21, 2004
Hey all!
This may sound like a weird one but i couldn't think of a better audience to ask!
If you are a SQL Server DBA (or were, or aspire to be, or play one on T.V., etc.) and the CIO of your 2.something billion $ a year company has offered you an 1 hour forum to sit down and ask him anything you want with the pretense of getting a straight answer, what would you ask?
I know this offers an excellent opportunity to cut up a bit...and do so if you must (keeping us entertained around here is important too!)...but i'm looking for work related, SQL related, direction, strategy, etc, etc type stuff.
Not: 'Whats it like to drive a $250k 'benz to work everyday?' OR 'Can i have .5% of your $2,000,000 bonus this year?'
While i genuinely have those questions in my mind...i'm not looking to waste his $5,000 an hour ass's time - and I only have 1 hour to chew his ear off.
What do ya'll think?
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Nov 3, 2006
Hi,
What kind of functions i cannot use within a trigger?
Thanks for all your replys for my previous posts.
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Jan 4, 2007
If we don t have the right to create an SP, can we create a dynamic in memory kind of SP
what s the syntax pls?
Thanks a lot
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Nov 9, 2007
Hi all,
Just can't figure this out. I'll try not to give a long-winded explanation (I hope), let's say this is the table, for example:
[Table1]
RowNumber | Value
1 | 4
2 | 6
3 | 3
4 |10
5 | 6
6 | 5
7 | 8
8 | 8
9 | 2
10 | 6
I want to write a query that creates a column whose values are similar to (ROW_NUMBER -1), and resets each time a value is present.
Using the above example, 6 will be the test value. So, I want to know how many rows it takes till 6 is repeated.
Output would be:
RowNumber | Value | Spread
1 | 4 | 1
2 | 6 | 0
3 | 3 | 1
4 |10 | 2
5 | 6 | 0
6 | 5 | 1
7 | 8 | 2
8 | 8 | 3
9 | 2 | 4
10 | 6 | 0
I think PARTITION BY can be used somewhere, with the ORDER BY on the [RowNumber] - but I'm just not sure on which ranking function to use, and how to reset the Ranking on the number 6 (above example).
Any help would be appreciated. This has been a mind-teaser for me, and I give
Thanks,
Denvas
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Apr 4, 2008
I am gonig into interview for a junior developer position. The role involves a lot of SQL based work. Training is on the job, and they know I am new to this, but they want to know what I can do with SQL server by wednesday, and obviosuly I stand a better chance if I can do a reasonable amount by then.I am assuming I can practise with offline databases, so I would like to do that. Also I was wondering if there were any simple example databases I can load up.
I have downloaded and installed the software, and would like to know how to connect and create a test database.
There will be a small test in the interview and the questions are:
1. SQL Management and Data Extraction
For this task you will need to be familiar with database tables, data types and constraints. There will be some administration work using SQL Management Studio along with some T-SQL queries. You will need to show use of the SELECT, INSERT, UPDATE and DELETE statements. If you do not have SQL Server, you can download the express edition for free at the following URL. http://msdn2.microsoft.com/en-us/express/bb410791.aspx
2. XSLT
For this task I will be asking you to produce some HTML output displaying the data from an XML file. The concept is similar to ASP.
3. Database Design
You will be given a scenario for a company that requires some database software for the smooth running of their organisation. You will need to plan and design a data structure to accommodate these requirements. You will be allowed to spend as much time on this part of the test as you wish. Key information here is going to be database normalization.
These questions dont make a whole lot of sense to be at the moment, so would appreciate a breakdown in simpler terms.
This job will be a fantastic opportunity for me to get into development, and would appreaciate any help that you guys have to offer, thanks in advance.
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