constraints

Currently In our database design we have an circular reference between two entities. In other words, we have foreign keys in each table that reference each others primary key. In order to insert records in these tables we need to perform a deferred constraint checking. Is this possible in SQL Server 2008? I know Oracle DDL has special syntax for this. Aaron Alton There is no native way to do deferred constraint checking in SQL Server. Likely your best option is to insert a NULL value into the foreign key column in the first table until the second record is inserted, and then as part of the

This is probably a simple answer but I can't find it. I have a table with a column of integers and I want to ensure that when a row is inserted that the value in this column is greater than zero. I could do this on the code side but thought it would be best to enforce it on the table. Thanks! I was in error with my last comment all is good now. You can use a check constraint on the column. IIRC the syntax for this looks like: create table foo ( [...] ,Foobar int not null check (Foobar > 0) [...] ) As the poster below says (thanks Constantin), you should create the check constraint outside the

I am trying to insert into a new record to my postgresql using Hibernate and Java EE. This is my model: @Entity @SuppressWarnings("serial") @Inheritance(strategy=InheritanceType.JOINED) public class BaseDesign implements Serializable { @Id @Expose @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "id", updatable = false, nullable = false) private Long id; @Version @Column(name = "version") private int version; @Expose @Column(name = "name") private String name; // getter and setter } And here is my import.sql INSERT INTO basedesign (id, name, version) VALUES (1, 'China', 0);

I have not found any answer regarding my question, all unique constraint questions did not involve MS Access. The question is how to make a unique constraint on multpile fields in MS Access 2003 database? If my table consists of columns id, A, B, C, D, E, F . I have an index on column id , but I would like to have a unique constraint set on both columns A and B . Hence, I may have a duplicate value in column A , provided the value in column B are different. I want to stress that I am not interested in a workaround like creating new column with concatenated values from columns A and B , and

Hello I am trying to display the constraints in one of my tables but for some reason I get the message no rows selected. Noted below is the table I have created. Create table Teams ( TeamID varCHAR2(4) constraint Teams_TeamID_PK Primary Key, TeamName VARCHAR2(40) ); This is the code I am using to show my constraints. SELECT constraint_name, constraint_type, search_condition FROM USER_CONSTRAINTS WHERE table_name = 'Teams'; I am a rookie so I want to make sure I understand what is wrong. I have tried to drop the table thinking that my constraints did not take - I did not, nor did I receive any