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• does it makes sense to use int instead of char or nvarchar for a discriminator column if I'm using i

  - by Omu

  I have something like this: create table account ( id int identity(1,1) primary key, usertype char(1) check(usertype in ('a', 'b')) not null, unique(id, usertype) ) create table auser ( id int primary key, usertype char(1) check(usertype = 'a') not null, foreign key (id, usertype) references account(id, usertype) ) create table buser ( ... same just with b ) the question is: if I'm going to use int instead of char(1), does it going to work faster/better ?

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• workbench vs phpmyadmin

  - by ajsie

  i've only used phpmyadmin but then i stumbled upon mysql workbench that looks promising. i wonder if someone has tried it out and could give your thoughts about it compared to phpmyadmin. could it replace phpmyadmin completely? thanks in advance

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• Berkeley DB java edition, any LGPL or BSD alternatives in Java?

  - by Ali

  Hi All, I am dealing with a huge dataset consisting of key-value pairs. The queries are always in the form of range queries on the key space (keys are numbers) hence any persistent B-Tree like structure will handle the situation. I would like to use BDB-Java Edition but the product is closed source and my company doesn't want to buy BDB-JE License. I am wondering, would you please share your experience with any non-GPL java based key-value storage system. Thanks, -A

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• Django models: Use multiple values as a key?

  - by Rosarch

  Here is a simple model: class TakingCourse(models.Model): course = models.ForeignKey(Course) term = models.ForeignKey(Term) Instead of Django creating a default primary key, I would like to use both course and term as the primary key - taken together, they uniquely identify a tuple. Is this allowed by Django? On a related note: I am trying to represent users taking courses in certain terms. Is there a better way to do this? class Course(models.Model): name = models.CharField(max_length=200) requiredFor = models.ManyToManyField(RequirementSubSet, blank=True) offeringSchool = models.ForeignKey(School) def __unicode__(self): return "%s at %s" % (self.name, self.offeringSchool) class MyUser(models.Model): user = models.ForeignKey(User, unique=True) takingReqSets = models.ManyToManyField(RequirementSet, blank=True) takingTerms = models.ManyToManyField(Term, blank=True) takingCourses = models.ManyToManyField(TakingCourse, blank=True) school = models.ForeignKey(School) class TakingCourse(models.Model): course = models.ForeignKey(Course) term = models.ForeignKey(Term) class Term(models.Model): school = models.ForeignKey(School) isPrimaryTerm = models.BooleanField()

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• Teradata equivalent of persisted computed column (in SQL Server)

  - by Cade Roux

  We have a few tables with persisted computed columns in SQL Server. Is there an equivalent of this in Teradata? And, if so, what is the syntax and are there any limitations? The particular computed columns I am looking at conform some account numbers by removing leading zeros - an index is also created on this conformed account number: ACCT_NUM_std AS ISNULL(CONVERT(varchar(39), SUBSTRING(LTRIM(RTRIM([ACCT_NUM])), PATINDEX('%[^0]%', LTRIM(RTRIM([ACCT_NUM])) + '.' ), LEN(LTRIM(RTRIM([ACCT_NUM]))) ) ), '' ) PERSISTED With the Teradata TRIM function, the trimming part would be a little simpler: ACCT_NUM_std AS COALESCE(CAST(TRIM(LEADING '0' FROM TRIM(BOTH FROM ACCT_NUM))) AS varchar(39)), '' ) I guess I could just make this a normal column and put the code to standardize the account numbers in all the processes which insert into the table. We did this to put the standardization code in one place.

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• How do I get 5 records before AND after a record with a specific ID?

  - by richleland

  I have a table named scores with the columns id and score. I want to access a specific record by its id as well as the 5 records before and after it. Is there a way in SQL to say "grab the score with the id of n and x items before and after it?"

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• Postgres update rule returning number of rows affected

  - by Lithium

  I have a view table which is a union of two seperate tables (say Table _A and Table _B). I need to be able to update a row in the view table, and it seems the way to do this was through a 'view rule'. All entries in the view table have seperate id's, so an id that exists in table _A won't exist in table _B. I created the following rule: CREATE OR REPLACE RULE view_update AS ON UPDATE TO viewtable DO INSTEAD ( UPDATE _A SET foo = false WHERE old.id = _A.id; UPDATE _B SET foo = false WHERE old.id = _B.id; ); If I do an update on table _B it returns the correct number of rows affected (1). However if I update table _A it returns (0) rows affected even though the data was changed. If I swap out the order of the updates then the same thing happens, but in reverse. How can I solve this problem so that it returns the correct number of rows affected. Thanks.

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• SimpleDB to ActiveResource. Rails

  - by Victor P

  Im looking for a way to map an ActiveResource to SimpleDB I want to avoid plugins/gems as all I have used are outdated/buggy/not mantained It doesnt seem hard, I wonder if any of you have succesfully implemented a rails app with simpleDB as an Active Resource. How did you do it? Thanks.

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• Why does PostgreSQL have to be different (scheme does not exist)?

  - by Ben Dauphinee

  I'm not used to working with PostgreSQL, but am using Zend_Db_Select to create my queries. What does the error below mean? SQL error: ERROR: schema "il" does not exist In statement: SELECT il.count(*) AS "count" FROM "image_lite" AS "il" INNER JOIN "exif_parse" AS "ex" ON il.image_id = ex.image_id WHERE (ex.cam_make = 'apple')

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• Data sync solution?

  - by user321088

  For some security issues I'm in an envorinment where third party apps can't access my DB. For this reason I should have some service/tool/script (dunno what yet... i'm open to the best option, still reading to see what I'm gonna do...) which enables me to generate on a regular basis(daily, weekly, monthly) some csv file with all new/modified records for a certain application. I should be able to automate this process and also export at any time a new file. So it should keep track for each application which records he still needs. Each application will need some data in some other format (csv/xls/sql), also some fields will be needed for some application and some aren't... It should be fairly flexible... What is the best option for me? Creating some custom tables for each application? Based on that extracting modified data?

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• What is the best way to handle validity dates in applications ?

  - by user214626

  Hello, How do we model these objects ? Scenario 1: Price changes in a time period EffectiveDate ExpiryDate Price 2009-01-01 2009-01-31 800$ 2009-02-01 Null 900$ So, if the price changes to 910$ on 2009-02-15, then the system should automatically update the expiry date on the previous effective price to 2009-02-14, to keep it consistent. Scenario 2: No price specified between 2009-02-01 to 2009-02-28 EffectiveDate ExpiryDate Price 2009-01-01 2009-01-31 800$ 2009-03-01 Null 900$ So, if new price is specified for 2009-02-15 onwards , then the system should automatically set the expiry date on the record to be inserted to 2009-02-28, because already a record effective from 2009-03-01 exists. Please suggest an effective way to handle these scenarios to model my framework, or are there any frameworks around that can do this . Thanks

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• Foreign key,local key?

  - by user198729

  CREATE TABLE products ( id integer unsigned auto_increment primary key ) ENGINE=INNODB; CREATE TABLE orders ( id integer PRIMARY KEY auto_increment, product_id integer unsigned, quantity integer, INDEX product_id_idx (product_id), FOREIGN KEY (product_id) REFERENCES products (id) ) ENGINE=INNODB; Here the products and orders obviously have some kind of relation--foreign key relation. Also a coin has two sides,so I'm doubting how do we say which table is the foreign key side or local key side?

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• Better languages than SQL for stored procedures

  - by Ken Paul

  I'm getting increasingly frustrated with the limitations and verbosity required to actually commit some business logic to stored procedures, using languages such as Transact-SQL or PL/SQL. I would love to convert some current databases to Oracle and take advantage of its support for Java stored procedures, but that option is not available at the moment. What alternatives would you recommend in the way of databases that support stored procedures in other languages?

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• Populate an SQL Server 2k8 with Oracle Loader files

  - by Techpriester

  Hi folks. Here's the problem: I have a project that needs to be migrated to Microsoft SQL Server 2008. We have data in text files for the Oracle SQL Loader and now we need to get that data into the SQL Server DB. I could write a program that converts everything into INSERT statements but there has to be a more comfortable way to so this. Any suggestions? PS: I don't think my company wants to buy additional Software to do this job so that's out.

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• Need help with ConnectionString value in C#

  - by SzamDev

  Hi I have an idea and I want to apply it to my Application (C# .NET). When we connect to a DB (MS SQL Server 2008) in VS 2008, the ConnectionString saved in the Application Setting and it's a static varriable (no one can edit it unless you edit it inside VS 2008). I want a way to let my Application search for MS SQL Server and save it to Application Setting and use it to connect to my DB Programmatically. When my application start, the first thing to do is checking the ConnectionString if vaild, NOT Empty and test connection to MS SQL Server Successfully so if there is a proplem I think to show a window form to let the user enter some data like username and password for MS SQL Server 2008 Is there any way to do it?

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• IP address detection for geo-location or MAC address much secure?

  - by SuperRomia

  Recent study many websites are using geo-location technology on their Websites. I'm planning to implement one website which can be detect the web visitor more accurate. An found that Mozilla is using some kind of detect MAC address technology in their Geo-Location web service. Is it violate some privacy issue? I believe most of Geo-location service providers only offer country to city level. But the Mac address detection enable to locate the web visitors' location more correctly than using IP address detection. If detect the MAC address is not practical, which geo-location service provider is offering more accurate data to detect my Website visitor around the world?

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• MS Analysis Services OLAP API for Python

  - by Kaloyan Todorov

  I am looking for a way to connect to a MS Analysis Services OLAP cube, run MDX queries, and pull the results into Python. In other words, exactly what Excel does. Is there a solution in Python that would let me do that? Someone with a similar question going pointed to Django's ORM. As much as I like the framework, this is not what I am looking for. I am also not looking for a way to pull rows and aggregate them -- that's what Analysis Services is for in the first place. Ideas? Thanks.

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• RavenDB-Embedded Unstable In Cooperation With ASP .Net Web API Using 2-Tier Architecture

  - by Mohsen Alikhani

  My application is used RavenDB-Embedded Unstable 1.2.2127 that it's intracted with ASP .Net Web API in the separated assemblies. When I use "UseEmbeddedHttpServer = true" on the document store, first time I send a request to RavenDB, it executes properly but when I try for the second time my application displays Raven Studio. However, if UseEmbeddedServer setting be removed then my application will be running without any problems. My RavenDB is configured with the following codes in data tier : this.documentStore = new EmbeddableDocumentStore { ConnectionStringName = "RavenDB", UseEmbeddedHttpServer = true } and implementation of Web.config have these settings in the service tier : <connectionStrings> <add name="RavenDB" connectionString="~\App_Data\RavenDatabase" /> </connectionStrings> Is there a setting I missed?

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• Vehicle 2 Vehicle Communication Questions

  - by pinnacler

  I have a rare opportunity to meet the man in charge of implementing vehicle 2 vehicle communication for the US Department of Transportation with 2 others in a few hours. Do YOU have any questions for him? I know this is a little outside the normal, but this is a 'reverse' thread and I felt he has some great knowledge on the subject that I want to share with this community. I'll post his answers later today to his questions. Ask about V2V implementation, privacy issues, use cases, or if you've thought of a great way to use V2V and want me to share it with him, he can at least think about it. He is in charge of panel that creates the standard. Or anything else...

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• Which data type saves more space TINYTEXT or VARCHAR for variable data length in MySQL?

  - by John M.

  I need to store a data into MySQL. Its length is not fixed, it could be 255 or 2 characters long. Should I use TINYTEXT or VARCHAR in order to save space (speed is irrelevant)?

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• Anything similar to Hibernate in PHP?

  - by harigm

  I am a Java programmer and was working on a project using Hibernate and Struts for some time. Now For my new project, I am working on PHP and Mysql (learning PHP). Is there any technology which is similar to Hibernate for PHP? If yes, can anyone give me the link where I can understand and use it? Is there a POJO concept in PHP?

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• Firebird Data Access Designer (DDEX) installation

  - by persian Dev

  hi i want to use firebird library , and i followed its instruction as below , but i get "The referenced component 'FirebirdSql.Data.Firebird' could not be found." error. instruction : Prerequisites Make sure that you have Visual Studio .NET 2005 Standard or higher edition. Express editions are not supported. Registry update Remember to update the path in FirebirdDDEXProviderPackageLess32.reg or FirebirdDDEXProviderPackageLess64.reg, places where to update it are marked %Path%. Install the .reg file into the registry. Machine.config update Add the following two sections to machine.config (located usually at C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config and C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727\CONFIG\machine.config on 64-bit system). <configuration> ... <configSections> ... <section name="firebirdsql.data.firebirdclient" type="System.Data.Common.DbProviderConfigurationHandler, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> ... </configSections> ... <system.data> <DbProviderFactories> ... <add name="FirebirdClient Data Provider" invariant="FirebirdSql.Data.FirebirdClient" description=".Net Framework Data Provider for Firebird" type="FirebirdSql.Data.FirebirdClient.FirebirdClientFactory, FirebirdSql.Data.FirebirdClient, Version=%Version%, Culture=%Culture%, PublicKeyToken=%PublicKeyToken%" /> ... </DbProviderFactories> </system.data> ... </configuration> And subst: %Version% With the version of the provider assembly that you have in the GAC. %Culture% With the culture of the provider assembly that you have in the GAC. %PublicKeyToken% With the PublicKeyToken of the provider assembly that you have in the GAC.

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• how to get AutoIncrement value after JetUpdate() in Extensible Storage Engine (JetBlue)

  - by Chris Gray

  after calling JetSetColumns() and then JetUpdate() how do I retrieve the values for any freshly assigned autoincrement values?

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• what is a commit log?

  - by Yang

  in google's bigtable context, what does a commit log mean? and what is the use of a commit log?

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• Table-level diff and sync procedure for T-SQL

  - by Ville Koskinen

  I'm interested in T-SQL source code for synchronizing a table (or perhaps a subset of it) with data from another similar table. The two tables could contain any variables, for example I could have base table source table ========== ============ id val id val ---------- ------------ 0 1 0 3 1 2 1 2 2 3 3 4 or base table source table =================== ================== key val1 val2 key val1 val2 ------------------- ------------------ A 1 0 A 1 1 B 2 1 C 2 2 C 3 3 E 4 0 or any two tables containing similar columns with similar names. I'd like to be able to check that the two tables have matching columns: the source table has exactly the same columns as the base table and the datatypes match make a diff from the base table to the source table do the necessary updates, deletes and inserts to change the data in the base table to correspond the source table optionally limit the diff to a subset of the base table, preferrably with a stored procedure. Has anyone written a stored proc for this or could you point to a source?

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