Lookup Tables - One Or Many
Jun 22, 2007
So i am designing a new database that currently has several tables 'look up tables' that are used just to limit the values of columns in other tables.
my question is what is the best way to do this?
1. multiple tables - one for each set of values (ex: JobType, Position, PayGrade)
2. One large table that holds all the lookup values - has a 'Category' field to group them
3. put constraints on the columns of the tables that are 'looking up' and get rid of the lookup tables.
thanks
lucas
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Jun 27, 2007
Hi All,
Actually this is in regard to SCD Type 2 Dimension, Scenario is like that I am moving Fact table from some old source and I have dimensionA description value in fact which I want to replace with appropriate id from Dimension Table and that Dimension table is SCD Type 2 based on StartDate and EndDate and Fact Table doesn't contains direct date value rather there is timeId in Fact so to update the value in Fact table I have to Join Time Dimension table and other Dimension Table to replace fact Description with proper Id.
Lets assume DimensionA Structure
id
Description
StartDate
EndDate
Fact Table
id
measure1
measure2
TimeId
Description
Time Dimension
TimeId
Date
Day
Hour ...
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Dec 19, 2003
Ok say I would like to build a table for of the following questions(say 6 questions for the sake of argument):
Do I just stored the index of the radiobuttonlist. What are some resources that I could look at. Should I make a look up table.
5) If money were no object, I would live . . .
Prefer not to say
On a tropical island
In a New York penthouse
In an English castle
On a Texas ranch
In a Malibu beach house
In a mountain retreat (Selected)
On the moon
None of the above
1 --->
2 --->
3 --->
4 --->
5) --->6 This is the question we are looking at.
6 --->
How should I create the database table for the above example.
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Aug 22, 2007
I have facing a design problem and unable to justify which design to choose for my data model.
Usually, what we have is like data tables and reference tables to store data in those data tables.
My database has tables with 20-30 columns in them. And most of them (though not all of them), stores data from some reference tables. Meaning each column has an associated reference table where it stores possible list of values for that particular column. Sort of data domain for that column. FYI, My database is related to medical field.
For example, A table that has a varchar(40) column called "Differentiation". It can only store values from following list:
- Undifferentiated
- Moderate
- Poor
- Poor - Moderate
- Moderate - well
Now, to implement this, simple solution would be to have a reference table where I can store all these possible values...And then have just a reference of each data item into my "Differentiation" column in the table.
This is simplest and probably the best solution for such thing and i can also have referential integrity implemented for this.
But now if we look at the bigger picture, my database is growing and I have about 80 tables which I need to create where most of the columns will have different reference tables like I mentioned above. Approximate number of reference tables is 300 tables. All the reference table will have same structure, with different values for different columns.
Now, what seems to me is, because the table structure is same for every column, rather than having 300 different tables, I can only have 2 tables, where I can put all these reference values into these 2 tables.
Like,
Table 1 :
This table can have name of the reference table like "differentiationlist" etc.
Table 2:
It has reference to the reference table list in Table 1 discussed above and all the values that are part of that reference table can go in this table with its reference.
But problem with this is, because all the reference tables are in these two tables, I don't know how to implement referential integrity in this design.
Does anyone have any idea or solution for situation like this?
Thanks,
Ujjaval
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Jul 11, 2007
I'm creating an application that will allow users to contribute "content". The content can be tagged, saved as "my content", etc... very web 2.0'ish. The site will rely very heavily on SQL Server 2005. By default, there is a Content table that simply stores the content with an identity column PK. There is also a Tag table and User table.
What is the most effective schema for speed and reliable scalability? Eventually there could be hundreds to thousands of people contributing and tagging content.
Idea 1: Lookup TablesSimply make a new table that holds the TagID and UserID. The table will be very important as it will be queried very regularly to show the users which tags they have stored.Pros: This will effectively allow me to store & query what tags the user has selected. It's simple to setup and the application won't have to work much with the data returned from the query.Cons: What happens when there are thousands of users tagging content? At what point does it become very inefficient to query a table that has a huge number of rows?
Idea 2: Comma Delimited ListSimply has a field in the user table that has a comma delimited list of TagID's the user has selectedPros: Keeps table size low, fairly easy to implement.Cons: Application has to perform more work. It has to separate the TagID's by comma, and requery the database to get each tags data, based on TagID.
Those are basically the only two methods I've really got experience using. The reason for this post is to see if there are methods that I'm not aware of that are better suited for what I'm trying to do.
Any assistance is greatly appreciated, thank you in advance!
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Jul 20, 2005
Hi,If you have lookup tables which are used by multiple tables (e.g.'City' lookup table might be used by the 'Employee' and the 'Company'tables) do we need to link it to both tables? Or can it sit by itselfand just referenced?Cheers,Jack
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Jun 11, 2007
Hi!
It's been always said that it is best to put index on commonly joined fields in the table. But putting too much index on the table would cause the table to be slow on insert and update.
My question is, how do you deal with your fields that uses look up tables? Like for example for these fields
- CountryID(smallint)
- CreatedBy(int)
- ModifiedBy(int)
- Status(tinyint)
Those fields don't come a big part in the table, though when I query the table I always join them with their respective primary table to get their respective text value. Do I still need to put Index & FK relationships to these fields?
What fields are normally good candidates for index or fk relationships?
Thanks,
Enzo
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Jul 20, 2005
Two tables:T1 (c1 int, TestVal numeric(18,2), ResultFactor numeric(18,2))--c1 isthe primary key.T2 (x1 int, FromVal numeric(18,2), ToVal numeric(18,2), Factornumeric(18,2))--x1 is the primary key. T2 contains non-overlappingvalues. So for eg., a few rows in T2 may look like.1, 51, 51.999, 512, 52, 52.999, 52........32, 82, 82.999, 82........T2 is basically a lookup table. There is no relationship between thetwo tables T1 and T2. However, if the TestVal from T1 falls in therange between FromVal and ToVal in T2, then I want to updateResultFactor in T1 with the corresponding value of Factor from the T2table.------Example for illustration only---------------Even though tables cannot be joined using keys, the above problem is avery common one in our everyday life. For example T1 could beemployees PayRaise table, c1=EmployeeID, with "TestVal" representingtest scores (from 1 to 100). T2 representing lookup of the ranges,with "Factor" representing percent raise to be given to the employee.If TestVal is 65 (employee scored 65% in a test), and a row in T2(FromVal=60, ToVal=70, Factor=12), then I would like to update 12 intable T1 from T2 using sql;. Basically T2 (like a global table)applies to all the employees, so EmpID cannot serve as a key in T2.---------------------------------------------------------Could anyone suggest how I would solve MY PROBLEM using sql? I wouldlike to avoid cursors and loops.Reply appreciated.Thanks
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May 16, 2006
Hello.
I have a car table, whose rows contain cars and their respective weight:
Ex: (1, 1000), (2,1100), (3, 900) etx.
I also have a car class table with the classes cars can fall into, based on a lower bound and an upper bound in which the car's weight must fit.
Ex: (Class1, 0, 999), (Class2, 1000, 1499), (Class3, 1500, 1999), etc.
I need to match each car to it's respective class. I've already search the database for post on this subject, but unfortunatelly my goal is yet to be reached. Can someone help?
Thanks in advance,
Hugo Oliveira
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Sep 18, 2006
I try to convert a Procedure that join 8 tables with INNER AND OUTER JOIN, my understanding is that the Lookup task is the one to use and I should break these joins into smaller block, it takes a long time to load when I do this, since each of these tables had 10-40mill. rows and I have 8 tables to go thru, currently this Stored Procedure took 3-4min to run, by converting this to 8 Lookup tasks, it ran for 20min. has anyone run into this issue before and know a work around for this.
Thanks
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Aug 5, 2015
I am trying a create views that would join 2 tables:
Table 1: Has all the columns need by a view (
Name: Product
Structure: ID, Attribute 1, Attribute 2, Attribute 3, Attribute 4, Attribute 5 etc
Table 2: Is a lookup table that provides the names of columns
Name: lookupTable
Structure: tableName, ColumnName, columnValue
Values: Product, Attribute1, Color
Product, Attribute2, Size
Product, Attribute3, Flavor
Product, Attribute4, Shape
I want to create a view that looks like
ID, Color, Size, Flavor, Shape
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Oct 31, 2007
We did some "at scale" fuzzy lookup tests today and were rather disappointed with the performance. I'm wanting to know your experience so I can set my performance expectations appropriately.
We were doing a fuzzy lookup against a lookup table with 25 million rows. Each row has 11 columns used in the fuzzy lookup, each between 10-100 chars. We set CopyReferenceTable=0 and MatchIndexOptions=GenerateAndPersistNewIndex and WarmCaches=true. It took about 60 minutes to build that index table, during which, dtexec got up to 4.5GB memory usage. (Is there a way to tell what % of the index table got cached in memory? Memory kept rising as each "Finished building X% of fuzzy index" progress event scrolled by all the way up to 100% progress when it peaked at 4.5GB.) The MaxMemoryUsage setting we left blank so it would use as much as possible on this 64-bit box with 16GB of memory (but only about 4GB was available for SSIS).
After it got done building the index table, it started flowing data through the pipeline. We saw the first buffer of ~9,000 rows get passed from the source to the fuzzy lookup transform. Six hours later it had not finished doing the fuzzy lookup on that first buffer!!! Running profiler showed us it was firing off lots of singelton SQL queries doing lookups as expected. So it was making progress, just very, very slowly.
We had set MinSimilarity=0.45 and Exhaustive=False. Those seemed to be reasonable settings for smaller datasets.
Does that performance seem inline with expectations? Any thoughts to improve performance?
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Sep 26, 2007
I'm working with an existing package that uses the fuzzy lookup transform. The package is currently working; however, I need to add some columns to the lookup columns from the reference table that is being used.
It seems that I am hitting a memory threshold of some sort, as when I add 3 or 4 columns, the package works, but when I add 5 columns, the fuzzy lookup transform fails pre-execute:
Pre-Execute
Taking a snapshot of the reference table
Taking a snapshot of the reference table
Building Fuzzy Match Index
component "Fuzzy Lookup Existing Member" (8351) failed the pre-execute phase and returned error code 0x8007007A.
These errors occur regardless of what columns I am attempting to add to the lookup list.
I have tried setting the MaxMemoryUsage custom property of the transform to 0, and to explicit values that should be much more than enough to hold the fuzzy match index (the reference table is only about 3000 rows, and the entire table is stored in less than 2MB of disk space.
Any ideas on what else could be causing this?
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Sep 23, 2015
Say I want to lookup a value in another dataset, but there is a grouping that requires you to know what the values for each level is in order to get to the correct detail record. Can you still use the lookup function with more than one field to compare against? So for example
Department
\___SalesPerson
\___Measure
I want to be able to add a new row at the Measure level, but lookup each field from another dataset. In order to do that I will need the Department AND SalesPerson values to do the lookup, but I dont think the Lookup function will let us do that will.
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Jul 24, 2007
I am doing a lookup that requires mapping 2 columns in the column mapping section. When I do this, I get the error "Row yielded no match during lookup" . The SQL that I captured in SQL profiler does find the record when I run it in Management Studio. I have already tried trimming everything to no avail.
Why is this happening?
I tried enabling memory restrictions but then I my package hangs and I get a SQLDUMPER_ERRORLOG.log file with the following logged:
07/24/07 13:35:48, ERROR , SQLDUMPER_UNKNOWN_APP.EXE, AdjustTokenPrivileges () failed (00000514)
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, Input parameters: 4 supplied
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, ProcessID = 5952
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, ThreadId = 0
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, Flags = 0x0
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, MiniDumpFlags = 0x0
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, SqlInfoPtr = 0x0100C5D0
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, DumpDir = <NULL>
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, ExceptionRecordPtr = 0x00000000
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, ContextPtr = 0x00000000
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, ExtraFile = <NULL>
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, InstanceName = <NULL>
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, ServiceName = <NULL>
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, Callback type 11 not used
07/24/07 13:35:48, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, Callback type 15 not used
07/24/07 13:35:49, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, Callback type 7 not used
07/24/07 13:35:49, ACTION, SQLDUMPER_UNKNOWN_APP.EXE, MiniDump completed: C:Program FilesMicrosoft SQL Server90SharedErrorDumpsSQLDmpr0033.mdmp
07/24/07 13:35:49, ACTION, DtsDebugHost.exe, Watson Invoke: No
Why am I getting this error with "Enable Memory Restriction"?
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Sep 29, 2006
Hi all,
I don't understand what's happening here.
I have a Conditional Split with 3 outputs. On the first output I have a lookup, when I execute the package I have 56 rows going through the Conditional Split, all rows are then going to the 2nd and 3rd output but the lookup on the first output generates an error "Row yielded no match during lookup".
I don't understand why the lookup is generating an error while there is no row going through it.
Any idea ?
Sébastien.
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Oct 4, 2007
I am designing a ssis package,This is intends to mine text data(Data extracted from websites).
Term lookup/Term extraction has been used as tools for mining.
I have lookup terms defined with me for reference table,but the main problem lie in extracting the nearby text/number/charcters to these lookup terms during mining.
For example :
I found noun "Email" 200 (frequency score) times in my text,Now I want to extract nearby email address(this is also true for PhoneNumber,Address attributes also).so how can I achieve this with SSIS.
If u have some idea/suggestion to carry out this challenge with or without Term Extraction/Term Lookup,plz do write here.
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Jan 24, 2008
I'm new to my company, although not new to SQL 2005 and I found something interesting. I don't have an ERD yet, and so I was asking a co-worker what table some data was in, they told me a table that is NOT in SQL Server 2005's list of tables, views or synonyms.
I thought that was strange, and so I searched over and over again and still I couldn't find it. Then I did a select statement the table that Access thinks exists and SQL Server does not show and to my shock, the select statement pulled in data!
So how did this happen? How can I find the object in SSMS folder listing of tables/views or whatever and what am I overlooking?
Thanks,
Keith
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Aug 2, 2004
I want to lookup values from a database into another database both of which are in the same sql server 2000. One databases is called GamingCommissiondb the other is called LicensingActions I need some of the tables to communicate with each other, to look values from one another. Example I need the Termination table to look up values from the Revocations table. Would using LinkedServers suffice??
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Jul 20, 2007
Hi,
Can anybody provide me a Lookup UDF? I need to supply columnname,Tablename and condition dynamically and I need the scalar value in return.
Any help will be greatly appreciated...
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May 1, 2008
Hi,
I am transferring the xml data from an xml file into sql server table using ssis.
To avoid any duplicate import via this ssis package, I would like to first check if data exists in the sql server table for what is about to be imported. If so then delete the existing data and then import.
Question:
How do I get the field value say ID field from the file and then take this id and delete these from the table in sql server first.
Is this to do with lookup or is there an easier way to do this please?
thanks
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Mar 15, 2007
Hi
I am trying to use lookup to see if a item esists in my table ( 3 key fields ). If the lookup fails I want to insert the records. If it succeeds I have put a recordcount to catch the items that are not required. I don't think that I understand the settings for failed rows. I have tried setting the Configure Error Output to redirect, but this does not seem to work. I have the below errors.
[SQL Server Destination [151]] Error: Unable to prepare the SSIS bulk insert for data insertion.
[DTS.Pipeline] Error: component "SQL Server Destination" (151) failed the pre-execute phase and returned error code 0xC0202071.
Can someone please advise me how to set up this component to work for my application
Thanks
ADG
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Apr 13, 2008
Hi,
I am using SCD and Lookup for Incremantal ETL load. But it is very interesting that
my 3000 recs is becoming 2500 when I put SCD and lookup. if I replace dummy multicast then
it is 3000.
thanks
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Sep 4, 2007
Hi,
Before inserting records of a recordset I would like to check that each one of these records doesn't exist in the destination table 1. If the records exist, they should be redirect to other table 2.
For this purpose I use a lookup task. The referende table is the destination table 1. The green line is linked to table 2 and the red line is linked to table 1.
The first execution works properly and copies de records to table 1, but on the next executions the records are copied to table 1 instead of being copied to table 2.
Any idea??
Thanks.
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Jul 24, 2007
say i have a customer.aspx that allows a user to enter in customer data.
on customer.aspx, i have dropdownSalesRep which allows the user to associate a sales rep with the customerbut some customers come to directly, and not thru a sales rep, so I want the user to be able to specify "none"
Is it best to have a dummy record in my SalesReps table called "none" with an ID of say "999", or is there some other better way to deal with this?
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Mar 16, 2001
Hi Guys,
I really need to know if it is possible to look in a Transaction Log for a specific transaction, it is for audit purposes. In the affirmative case, could you teach me how to do it or at least point me in the right direction.
I'll really appreciate your help ;-)
Regards.
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Nov 3, 2000
I have a DTS package that calls a LOOKUP objects in an activeX script,
I did not create this package and I am trying to figure out what it does,
How do I view the actual LOOKUP object? I know what the LOOKUP object name is but cannot seem to find where it is actually stored?
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Nov 7, 2003
execution plan of procedure shows
bookmark lookup cost : 46%
any way to reduce it ?
Thanks
alex
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May 3, 2002
I am trying to understand how to create an SP that will do the following on a varchar field:
Someone enters a [Policy No] and the result set returns the [Policy No] the user entered (if found), plus 10 [Policy No]'s above and 10 [Policy No]'s below the [Policy No] they were looking for.
I figure this has to be a common thing that others have encountered, of course maybe not on a varchar data type field, but still this must be possible.
If anyone can shed some light on this SP-Lookup with either some code or a general direction to go towards - I would greatly appreciate it!
Thank you,
Black
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Dec 17, 2004
Hi
I'm new in SQL. I have a big problem
Database: MSSQL 2000
I have two tables: (results) one with numeric results and one with names (importance_scale)
SELECT * FROM results
name i1 i2 i3 i4 i5
---- ---- ---- ---- ----
john 2 1 2 2 2
anna 0 2 2 2 2
phil 2 2 2 2 2
dave 1 0 2 2 2
SELECT * FROM importance_scale
imp_value imp_name
--------- ------------
2 very important
1 important
0 not important
i1,i2 etc. value it is a imp_value from table 'importance_scale'
I would like to make report which will show all results in this format (in example only first record):
name i1 i2 i3 i4 i5 etc.
----- --- --- --- --- ---
john very important important very important very important very important etc.
I was thinking about using CASE I don't want use cursor. What is the best way?
Thanks for your help
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May 8, 2008
Hi, this may be a basic question but i can't get my mind straight and need some advice.
I've read there's limitations on using the Lookup Task.
What i want to do is simply look if a Data exists on a table, if it does i want to update some columns (or delete the row and insert a new row), if it doesnt exists i want to inser a row.
That's all, easy as hell in sql and c#/.net
The thing is i dont know whats the best way of doing it in SSIS.
My limited ssis knowledge tells me Script Component should be able to do the work. That is, send it a variable holding the values i want to verify in the database and depending if it exists to the whats necesary.
So my question is, can i connect to the DB via Script and make my custom selects there?
If so how can i do it?
If not, what's the best way of doing that simple task?
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Feb 16, 2007
Hi,
I am using a fuzzy lookup to cleanse data from a sales line details table, during the import process. The sales order line details contains a filed called 'reference' and this is compared to a field called 'category' in another table.
Using data viewers to check through the cleansing process, I notice that the fuzzy lookup doesn't seem to match i.e.
tbl.salesline.reference = 'I3' -> tbl.sales.category ='I03'
the above is OK, but the lookup also returns the following
tbl.salesline.reference = 'I9' -> tbl.sales.category ='I01'
The value I9 doesnt exist, and is miskeyed by user entry, and should have been 'I99'. I would have expected the fuzzy lookup to pickup the I99 value as at least two of the chrs are matching, but no, it picks the first 'I*' in the table.
If I expand the fuzzy lookup to return more results, i.e. 5 per record, then it returns the first 5 results....I01, I02 I03 and so on.
Is there a way of improving the fuzzy lookup itself?
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Aug 1, 2007
Hi All,
I am doing something really simple and it doesnt work, may be I am missing something, What I am trying to accomplish is to load a fact table using lookup transaformation, however my source data was different from the data in my dimension (or the datatype ) I had to use a data conversion task before my lookup , so the data flow is something like this source -> Data Conversion -> Lookup -> destination , I am getting an error at my lookup task where it says the "[Lookup [82]] Error: Row yielded no match during lookup". and then it just fails. I know for sure that there has to be matching data. donno what is it that I am missing.
Thanks
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