Pros/Cons Of Multivalue Database Columns
Jun 27, 2004
I'm just wondering what any pros and cons of using multivalue columns in a database are.
I'm designing a database which will have a column for FABRIC_TYPES_AVAILABLE for a certain FURNITURE_ITEM. Each FURNITURE_ITEM can have multiple FABRIC_TYPES_AVAILABLE of course. So I was just going to store a 2 or 3 digit number of the FABRIC_TYPES_AVAILABLE in that row. So I would have something like....34,24,453,32,23,45,67,65,43,21,21,45.
Anyway....thanks in advance for any information. Links I could read would be great too...b/c I did do a bit of searching, but didnt find much.
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Oct 26, 2007
Are there any vices to using default constraints on all columns in your table.
For example an Int that defaults to 0
or a char or varchar that defaults to ''
I know that 0 and Null are not the same thing. But if your programs don't have the concept of NULL then you have to convert the NULL to zero.
So, DEFAULT CONSTRAINTS on every column. Is it good or Bad?
Thanks
Darin Clark
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Jun 19, 2008
Can someone provide information or a link to information regarding the pros and cons of saving files directly into a SQL 2005 database?
I'm actually for saving files to a database (cleaner implementation then just saving the location then having to get the file, etc), but my project manager is not convinced so I need to make an argument for (or against depending on what I actually find out) using varbinary data type.
Thanks.
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Jun 27, 2007
I am using transaction replication between a transaction and reporting database server. When I use a snapshot to initialize my subscribers, I currently get a lot of deadlocks during the snapshot creation. I am considering using a database backup instead. Can anyone tells me how to reduce the table locks that I am getting during snapshot creation or advice on using database backups?
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May 22, 2002
My company is thinking about moving to a product that uses Microsoft SQL Server and I have been asked to find out what are the Pros and Cons of the product, if any.
Any feedback is appreciated.
Thank You
Pam
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Aug 13, 2001
Anyone know where I could find some good articles about pros and cons of upgrading SQL 7 to SQL 2K?
Our boss suddenly got this bug up his rear that we need to upgrade. :(
Probably because we are to a point where everything is running smoothly, and he needs to throw a monkey wrench in it.
We are a very small shop, and are not stressing SQL 7 in the least. I am interested to read some articles about SQL 2K, because right now, I can't see any possible reason an upgrade would be worth doing.
Thanks.
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Nov 3, 2005
I have a requirement where I need to perform a query for positioninformation. But for some types of entries, I need to "expand" the rowto include additional position rows. Let me explain with an example:An index is a security that is made up of components where eachcomponent has a "weight" or a number of shares. So if I have 1 share ofthe index, I have X shares of each component.AAPL is an Equity, CSCO is an Equity, SPY is an Index. Lets say thatSPY has one component, AAPL, with shares being 10. (1 share of SPY = 10shares of AAPL).So, I do some trading and I end up with positions as follows:+10 AAPL-5 CSCO+2 SPYThe query I need returns:+10 AAPL-5 CSCO+2 SPY+20 AAPL (from 2 SPY * 10 shares)which becomes (after grouping):+30 AAPL-5 CSCO+2 SPY-----------------------------------------Based on that criteria and the following schema (and sample data):-- Drop tablesDROP TABLE [SecurityMaster]DROP TABLE [Position]DROP TABLE [IndexComponent]-- Create tablesCREATE TABLE [SecurityMaster] ([Symbol] VARCHAR(10), [SecurityType] VARCHAR(10))CREATE TABLE [Position] ([Account] VARCHAR(10), [Symbol] VARCHAR(10), [Position] INT)CREATE TABLE [IndexComponent] ([IndexSymbol] VARCHAR(10), [ComponentSymbol] VARCHAR(10), [Shares] INT)--Populate tablesINSERT INTO [SecurityMaster] VALUES ('AAPL', 'Equity')INSERT INTO [SecurityMaster] VALUES ('MSFT', 'Equity')INSERT INTO [SecurityMaster] VALUES ('MNTAM', 'Option')INSERT INTO [SecurityMaster] VALUES ('CSCO', 'Equity')INSERT INTO [SecurityMaster] VALUES ('SPY', 'Index')INSERT INTO [Position] VALUES ('001', 'AAPL', 10)INSERT INTO [Position] VALUES ('001', 'MSFT', -5)INSERT INTO [Position] VALUES ('001', 'CSCO', 10)INSERT INTO [Position] VALUES ('001', 'SPY', 15)INSERT INTO [Position] VALUES ('001', 'QQQQ', 21)INSERT INTO [Position] VALUES ('002', 'MNTAM', 10)INSERT INTO [Position] VALUES ('002', 'APPL', 20)INSERT INTO [Position] VALUES ('003', 'SPY', -2)INSERT INTO [IndexComponent] VALUES ('SPY', 'AAPL', 25)INSERT INTO [IndexComponent] VALUES ('SPY', 'CSCO', 50)INSERT INTO [IndexComponent] VALUES ('QQQQ', 'AAPL', 33)-- *****************************-- Based on the rules:-- 1) Index positions appear like other positions (account /symbol) pair, but-- its components show up as new rows of account (of index),symbol (equal--to component symbol), position (equal to shares * index position)-- 2) One row for each account / symbol pair (GROUP BY account andsymbol, SUM position)-- Expected output (without grouping) (sorted by account / symbol)-- 001 AAPL 10-- 001 AAPL 375 (component shares * index position) (25* 15) (SPY)-- 001 AAPL 693 (component shares * index position) (33* 21) (QQQQ)-- 001 CSCO 10-- 001 CSCO 750 (component shares * index position) (50* 15) (SPY)-- 001 MSFT -5-- 001 QQQQ 21-- 001 SPY 15-- 002 AAPL 20-- 002 MNTAM 10-- 003 AAPL -50 (component shares * index position) (25* -2) (SPY)-- 003 CSCO -100 (component shares * index position) (50* -2) (SPY)-- 003 SPY -2-- Expected output (with grouping account / symbol) (sorted by account/ symbol)-- 001 AAPL 1078-- 001 CSCO 760-- 001 MSFT -5-- 001 QQQQ 21-- 001 SPY 15-- 002 AAPL 20-- 002 MNTAM 10-- 003 AAPL -50-- 003 CSCO -100-- 003 SPY -2---------------------------------------------Is a UNION the best way to perform the query. What are the pros andcons? What, if any, is a better way?SELECT[Account], [Symbol], SUM([Position]) AS [Position]FROM(SELECT[Account], [Symbol] , [Position]FROM[Position]UNION ALLSELECTP.[Account] , IC.[ComponentSymbol] AS [Symbol] , (P.[Position] *IC.[Shares]) AS [Position]FROM[IndexComponent] ICJOIN[Position] PONP.[Symbol] = IC.[IndexSymbol]) DGROUP BY[Account], [Symbol]ORDER BY[Account], [Symbol]
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Jul 20, 2005
Hi alli am building a SQL 2000 database that it is proving a littlechallenging, i have companies with multiple addresses, phone numbers,owning mine sites etc and also joint ventures so maybe you get thepicture with a few design issues that i ma encounteringMy queriy is about a primary key identity, and which one to use withrespect to either the identity data type or the unique identifier ,I am aessentiall building an address table to hold all multipleaddresses as well as phone numbers etc, so my desire to have a uniqueidentity for each record is very important.My view is i will run in to violation errors by just using the tableidentity data type, i could i suppose use composit primary keys butthat may have a performance impact, although thiis will not be a hightransaction database.Does anyone know about performance issues regarding each identitysolution, by using a generated 16 bit identifier there are going to behuge numbers for the DB to verify. or am i worried about nothing?any views greatly appreciatedregardsGreg
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Mar 28, 2004
can anyone explain the Pros and Cons of Stored Procedures ??
thanks
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Sep 19, 2007
Im about to start converting code to Stored Procedures for all my reports in Reporting Services. I was wondering what the pros and cons of this may be.
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Sep 11, 2007
Thanks for the help on the previous thread.
It seems to me that either by accident or design, SQL Server tends to steer you away from backing up directly over the network.
Are there reasons for not doing this because you obviously don't want to leave your backups on a local drive in case the drive fails?
Some possibilties that I can think of are:-
1. Local drives have faster access times and SQL backups can get quite large. I did a quick test and found that a netwrok backup takes 2 to 3 times longer than it does on a local drive.
2. Backing up on the netwrok could hog too much bandwidth. I haven't tested this and would be surprised it it's true.
3. There could be some reason that you don't want the Server and Agent services running under a domain account but want to leave them on the Local System account. I am not aware of any such reasons by the way.
4. Local drives persumably have a slightly higher availability than network drives. If the server is running, the drive should be available.
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Apr 4, 2007
Like in the subject: What are the cons and pros of using nvarchar(max) versus ntext?
Does it have something to do with having to enable full text search perhaps in the latter case?
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May 9, 2006
I have a main database...for this large Web site...and Im wondering
what would be the PROS and CONS of using another database (located on
the same, or on another SQL Server). Im just thinking this would be
good incase we ever needed to take some load off one of the servers.
Also, we will be integrating Community Server into this Web site. Of
course you know CS adds its own database objects which crowd up our
main database objects.
We were thinking of giving CS its own database also; bad practice, or....it doesn't matter much?
Thank you
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Aug 17, 2006
I was wanting to know. I am making a site that might be come big. And me and this dude are considering pickering abotu GUID. I don't want to use them but he does. And I was wondering what should we do? I know nothing about guids
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Jun 15, 2006
vinod writes "Q1>Should I apply filter in sequence(based on primarykey,not null,comparision,between clause) ?
-How to apply filter in correct format,and SQL server internally execute it.
Q2>Should I use 'is not Null' to be put at the last?
Q3>Should I use 'between clause' rather than relation operator i.e(empid>10 and empid<200)
Q4>Does filters of sequence has any impact on the query execution process
table1[pkey1,col1,col2,col3] -->pkey is pkey1
table2[pkey2,pkey1,col11,col12,col13]--->pkey is pkey2, and pkey1 is foreign key
CaseI->select table2.pkey2,table1.col1 ,table2.col12
from table1 inner join table2
on table1.pkey1=table2.pkey1
where (table1.col3>100 and table1.col3<300 ) and table2.pkey1=2020 and table2.col13 is not null
CaseII->select table2.pkey2,table1.col1 ,table2.col12
from table1 inner join table2
on table1.pkey1=table2.pkey1
where (table1.col3 between 101 and 299 ) and pkey1=2020 and table2.col13 is not null"
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Jul 20, 2005
Hi All!We are doing new development for SQL Server 2000 and also moving fromSQL 7.0 to SQL Server 2000.What are cons and pros for using IDENTITY property as PK in SQL SERVER2000?Please, share your experience in using IDENTITY as PK .Does SCOPE_IDENTITY makes life easier in SQL 2000?Is there issues with DENTITY property when moving DB from one serverto another? (the same version of SQL Server)Thank you in advance,Andy
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Feb 26, 2008
hi all,
I was wondering if anyone knows of any pros/cons on storing SSIS (2005) packages within SQL Server 2005 SP2.
We're contemplating the migration/storage of a large number of packages, a minority of which designed in dts (SQLServer 2000) and using third party activx components.
thanks much for any feedback,
Cosmin
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Apr 20, 2001
We are in the process of replacing our primary production server. In the process of determining how SQL server is going to be structured, it has been suggested that I place all current and new indexes on a separate file group. These filegroups would then reside on a separate shelf on the server. What are the pros and cons of doing this?
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Mar 30, 2008
Hi, I need a help with a SP, professionals only. If you're interested PM/email me please.
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Jan 23, 2006
I need to start encrypting several fields in a database and have been doing some testing with a test database first. I've run into problems when attempting to restore the database on either the same server (but different database) or to a separate server.
First, here's how i created the symmetric key and encrypted data in the original database:
create master key
encryption by password = 'testAppleA3';
create certificate test
with subject = 'test certificate',
EXPIRY_DATE = '1/1/2010';
create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;
open symmetric key sk_Test decryption by certificate test;
insert into employees values (101,'Jane Doe',encryptbykey(key_guid('sk_Test'),'$200000'));
insert into employees values(102,'Bob Jones',encryptbykey(key_guid('sk_Test'),'$500000'));
select * from employees
--delete from employees
select id,name,cast(decryptbykey(salary) as varchar(10)) as salary from employees
close all symmetric keys
Next I backup up this test database and restore it to a new database on a different server (same issue if restore to different database but on same server).
Then if i attempt to open the key in the new database and decrypt:
open symmetric key sk_Test decryption by certificate test;
I get the error: An error occurred during decryption.
Ok, well not unexpected, so reading the forums, i try doing the below first in the new database:
ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY
Then I try opening the key again and get the error again:
An error occurred during decryption.
So then it occurs to me, maybe i need to drop and recreate it so i do
drop symmetric key sk_test
then
create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;
and then try to open it.
Same error!
So then i decide, let's drop everything, the master key, the certificate and then symmetric key:
drop symmetric key sk_test
drop certificate test
drop master key
Then recreate the master key:
create master key
encryption by password = 'testAppleA3';
Restore the certificate from a backup i had made to a file:
CREATE CERTIFICATE test
FROM FILE = 'c:storedcertsencryptiontestcert'
Recreate the symmetric key again:
create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;
And now open the key only to get the error:
Cannot decrypt or encrypt using the specified certificate, either because it has no private key or because the password provided for the private key is incorrect.
So what am I doing wrong here? In this scenario I would appear to have lost all access to decrypt the data in the database despite restoring from a backup which restored the symmetric key and certificate and i obviously know the password for the master key.
I also tried running the command
ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY
again but this does not resolve the issue.
Thx.
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Mar 10, 2000
Let's say I have a trigger on my orders table.
When this fires a query is done on the customer table to get some values
and put some order/customer data into an audit trail table.
In one period of time, it appears that the trigger did not put the data into the separate table. No known reason.
Suspicion: What if the customer table were locked by some process when the trigger fired. Maybe the trigger was chosen as a deadlock-victim.
?? I guess I need to check for @@ERROR during the trigger and do something. Any suggestions? I think I can raise the priority of my trigger to "win" during a deadlock.
If trigger activity is chosen as a deadlock-victim, can the trigger make another attempt to complete it's activity?
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Sep 21, 2007
Hi. I am fairly new to reporting. I have a report that currently displays queried data in both a table and a matrix. I'd like for the data that is displayed to be based off of my report parameters. I have three, all of which are multivalue. Currently, I am able to display the report, based on the only the first value of TWO of the three parameters. I tried using the dataset parameters, but was not successful with linking them to my report parameters. Please help! In addition, is there a way to set multivalue parameters to only display distinct values? Thanks, in advance, for any help.
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Jan 17, 2008
Hi,
I need to set a label in my report when all the values in a certain multivalue parameter are selected. In other words, i would need to check whether this parameter has the value "Select All" selected or not.
How do i accomplish this?
Thanks in advance,
Claudio
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Mar 27, 2007
We have a report that has a banner page. The user can select categories from a multi-select parameter and then this is passed into the report as a csv file. The actual report works doing this, however, we need the banner page to use this parameter's value (the multiple selected labels) to display a string of the selected values. For the textbox expression, we are using =Parameters!Cat.Value, but it always wants to reference Paramaters!Cat.Value(0). We were thinking of using a function in code to pass in the parameter and then concantenate each value into on string and return that string, but isn't there an easier way to do this?
Thanks for the information.
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Jun 7, 2007
I have passed a list of parameters to a multivalue parameter in a SQL Report.
I can click the drop down and see the list of parameters that were passed.
In my select statement for the report, here is the condition I am using in the where clause.
AND (SUBSTRING(C.CHARTOFACCTSACCOUNTNO,9,3) IN (@RUs))
Nothing is returned in the result set if more than one value is passed to the multivalue parameter.
Shouldn't the above conidition have the effect that no matter how many account numbers there are, the last three digits in the account number will be compared to each element in my multivalue parameter and if there is a match, it will be selected on the report.
For example, in the multivalue dropdown list, there are the following values:
211
212
If I pass 211 to the report, data is returned. If I pass 211, 212 to the multivalue parameter no data is returned.
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Apr 18, 2007
how do I create a multivalue parameter that has a default value of 'All' Or how to I I get the "Select All" option as the default parameter?
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May 11, 2007
I have multivalued parameter in my report. I have text box to display heading of the report. the report heading is dependent on the parameter selected.
with single value parameter the text box displays the correct parameter but it cannot with multi valued parameter. Is there any way to display the last value of the parameter in the heading of the report in case of multivalued parameter?
Ex. multivalued parameter is "YEAR"
my report shows the data for 3 years say 2003,2004,2005. report header should show 2005(last of the parameter list) report.
regds,
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Mar 20, 2007
Hello,
I have in my report a text box that lists the user selection. When the user select a few of the values I display the selection but when the user select "All" I would like the text box to say "Parameter: All".
Is there anyway to know if "All" was selected, I don't want to list all the values because sometime there are too many of them.
Thank you,
Itzhak
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Dec 6, 2006
i am trying to build a report that uses multivalue parameters - the report is a simple listing report that lists out a list of cases as a table - the data is obtained from a view which just returns all details for all cases
there is no user input for the selection details - am going to be calling the report and passing over the parameter values directly to it.
there are several parameters for the report - they all default to "All"
for each of these parameters, i need to be able to either use the default value of "ALL" or to enter a list (comma separated ?)
q1) could i just enter the list as a string comma separated list (rather than as multivalued parameters) and then use this list to filter the data using the FILTERS tab on the dataset
q2) if q1 is not possible, if i use multivalue parameters, how do i get my list of parameters into the report as the application calling the report just has a list of values
thx
mark
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May 13, 2008
I know I can't do this but I dont know will work. any help is much appreciated. the code below in red will always return more than one value, and yes the ?? is actually data (dont ask i didnt do it).
I am basically coding this because of the ?? someone before me thought was a good idea.
inner join MHDDTest.dbo.Admin_tbl_Vendor f on
(case when len(b.vadr) > 0 then
(case when (b.vadr = '??') then
(select vendorNumber from MHDDTest.dbo.Admin_tbl_Vendor
where (substring(afunction,3,2) + object) = '42305' and substring(vendorNumber,1,5) = b.vend)
else
b.vend + '-' + b.vadr
end)
else
b.vend
end
= f.vendorNumber)
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Nov 28, 2007
Is there an easy way to handle a multivalue parameter where the values could have comma's? I have County and State in a single column and want to select one from the multivalue parameter but when the string is passed it is not being found because I am parsing the parameter on comma. Here is what the drop down list looks like.
Dade,CA
Marion,CA
Brown,CA
Thanks,
vmon
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Oct 1, 2007
In SQL Server 2005 reporing services, I am using the syntax in the documentation for a multivalue parameter.
AND c.Track IN (@Track)
It works fine when I just select one value, but if I select 2 or more, I get an error about the commas being wrong. Is the syntax correct? Is there a way I can see the SQL generated by the report so I can see what is wrong?
Thanks,
Linda
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Apr 1, 2008
Hi,
I'm calling a report based on values collected from an ASP.NET page. It worked fine until I tried to pass a multivalue integer value.
ReportParameter seems to take a string[] just fine, but not a int[].
For example...
int[] incidents = prevPage.IncidentIDs;
string[] assets = prevPage.Assets;
ReportParameter[] parameters = new ReportParameter[2];
parameters[0] = new ReportParameter("IncidentID", incidents);
parameters[1] = new ReportParameter("Assets", assets);
throws the error: cannot convert from 'int[]' to 'string'
but changing incidents to a string like so:
string[] incidents = prevPage.IncidentIDs;
string[] assets = prevPage.Assets;
ReportParameter[] parameters = new ReportParameter[2];
parameters[0] = new ReportParameter("IncidentID", incidents);
parameters[1] = new ReportParameter("Assets", assets);
results in "The 'IncidentID' parameter is missing a value"
I've verified that incidents has values.
Any help is appreciated.
Thanks,
Tonya
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