Constraint like check constraints, not null constraints on MyISAM Storage Engines in MySQL
Can we use constraint like check constraints, not null constraints on MyISAM Storage Engines in MySQL? ...
constraints
How to rename a constraint when I don't know the name.
I need to rename a constraint in an Oracle databse, but I don't know the old name at design-time. What I would like to do is this: declare vOldName string; begin select CONSTRAINT_NAME into vOldName from user_constraints where TABLE_NAME='AGREEMENT' and CONSTRAINT_TYPE='R'; alter table Agreement rename constraint v...
How to create Composite Unique Constraint in SQL Server 2005
Preferably I would like to know how to do it using the SQL Server Management Studio interface but that isn't completely necessary. If you simply have a script to add one after a table is made that would be fine. ...
How to declare a range overlaping constraint in PosgreSQL database?
Let's say we are having a table with this definition: range ( id bigint primary key, colourId int references colour(id), smellId int references smell(id), from bigint, to bigint ) This table is actually a reduced view over enormously big table: item ( id bigint primary key, colourId int references colour(id), smellId ...
Mysterious constraints problem with SQL Server 2000
Hi all I'm getting the following error from a VB NET web application written in VS 2003, on framework 1.1. The web app is running on Windows Server 2000, IIS 5, and is reading from a SQL server 2000 database running on the same machine. System.Data.ConstraintException: Failed to enable constraints. One or more rows contain valu...
Tibco Rendezvous - size constraints
I am attempting to put a potentially large string into a rendezvous message and was curious about size constraints. I understand there is a physical limit (64mb?) to the message as a whole, but I'm curious about how some other variables could affect it. Specifically: How big the keys are? How the string is stored (in one field vs. mult...
How to drop all user tables?
How can I drop all user tables in oracle? I have problem with constraints. When I disable all it is still no possible. ...
what the difrent between primary..unique..foreign key, index
hi What is the difference between primary, unique and foreign key constraints, and indexes? I work on Oracle 10g and Sql Server 2008 thanks in advance ...
How to truncate all user tables?
How can I truncate all user table in oracle? I have problem with tables constraints. ...
How can I store NULLs in NOT NULL field?
I just came across NULL values in NOT-NULL fields in our test database. How could they get there? I know that NOT-NULL constraints can be altered with NOVALIDATE clause, but that would change table's last_ddl_time in USER_OBJECTS. And that time is less than the date that those records were created. Is there something else I'm overlooking...
SQL Server Replication (cross-database queries & constraints)
We want to replicate data from one database to several others (on another server). Would it make sense to replicate these tables to a shared database on the other server and have our cross-database queries reference the shared database... or would it make more sense to replicate out to each individual database on the other server? Would ...
is it good to use check constraints for business rules
Currently we are using check constraints for business rules implementation, but I want to know should we implement business rules in sql or Business logic(c# code) layer. I have searched on the net and finds that check constraints are good to use. please let me know if somebody knows more int detailed abt it. One more thing is that data ...
setting up unique constraint on referenced collumns in oracle 10g xe
hi, i have the following situation. table looks like this CREATE TABLE CompetitionsLanguages ( competition REF CompetitionType SCOPE IS Competitions, language REF LanguageType SCOPE IS Languages ); i need this table to have a unique constraint on (competition,language) combination. oracle tells me that i cant put a UNIQUE or PK o...
Requiring a method to be called in a child class constructor
How do I force the Visual Studio compiler to generate an error when a required method is not being called in the constructor of a child class? Like when you edit the form designer code, the compiler complains when InitializeComponent()isn't the first call in the constructor of a form. Is this even possible in VB.NET? ...
SQL Server add a column constraint to limit data to -1 to 1
Hello, I want to constrain a SQL Server decimal column to only allow -1,0,1 as valid values. Can you show me the SQL syntax for adding such a constraint. (I would like to know how to do it in both the CREATE TABLE statement and/or the ALTER TABLE ADD CONSTRAINT). Or can this only be accomplished in a trigger? Seth ...
How to Add a Column using SMO with UserefinedDatatype when that talble already has some data????
I'm making a Utility that compares 2 Databases and makes one Equal to the other by changing and adding objects (Tables, Views, UserDefinedDatatypes, Defaults, Functions etc etc etc) I'm trying to add a Column, not null with a userdefineddatatype wich has a Default defined, the problem is this: I'm not able to use BindDefault before the...
Good information about type systems based on contracts/constraints?
Hello! Problem: I am looking for good introduction about type systems, which are based on contracts/constraints (sorry, I don't remember which term one is appropriate for a type system). I need that information to be able to implement an experimental type system of such kind. As far as I know, such type system is used in XSD (Xml Sch...
Can a Type Derive from Itself?
When enforcing a Generic constraint class GenericTest { public void Sample<T>(T someValue) where T:Racer,new() { Console.WriteLine(someValue.Car); } } The Type T should be derived from the Base Type Racer (Correct me if anything wrong). public class Racer { string name; string car; pub...
Modify unique constraint in Oracle
I need to update an existing constraint in Oracle database to add a new column there. ALTER TABLE MY_PARTNER_DETAILS MODIFY CONSTRAINT UQ_MY_PARTNER_DETAILS UNIQUE(PARTNER_CODE,PGOOD_CODE,SITE_CODE,PARTNER_PLACEMENT,PARTNER_PARTICIPATION) Gives: Error at line 1 ORA-00933: SQL command not properly ended What's the problem with that? ...
SQL constraint minvalue / maxvalue?
Is there a way to set a SQL constraint for a numeric field that min value should be 1234 and max value should be 4523? ...