check-constraints

Date range overlapping check constraint

由 僤鯓⒐⒋嵵緔 提交于 2019-11-27 13:34:33
I've a simple table in sql server 2005 with 3 columns: DateStart, DateEnd and Value. I tried to set a "table check constraint" to avoid inserting overlapping records. For instance if in such table there is a record with DateStart = 2012-01-01 (first January) and DateEnd 2012-01-15 (15th January) than Check constraint must avoid inserting a record with DateStart=2012-01-10 (no care DateEnd), a record with DateEnd=2012-01-10 (no care DateStart) or a record with DateStart 2011-12-10 and DateEnd 2012-02-01. I defined a UDF in such way: CREATE FUNCTION [dbo].[ufn_checkOverlappingDateRange] (

How do I create a multiple-table check constraint?

由 社会主义新天地 提交于 2019-11-27 12:24:21
Please imagine this small database... Diagram removed dead ImageShack link - volunteer database diagram Tables Volunteer Event Shift EventVolunteer ========= ===== ===== ============== Id Id Id EventId Name Name EventId VolunteerId Email Location VolunteerId Phone Day Description Comment Description Start End Associations Volunteers may sign up for multiple events. Events may be staffed by multiple volunteers. An event may have multiple shifts. A shift belongs to only a single event. A shift may be staffed by only a single volunteer. A volunteer may staff multiple shifts. Check Constraints Can

WITH CHECK ADD CONSTRAINT followed by CHECK CONSTRAINT vs. ADD CONSTRAINT

由 感情迁移 提交于 2019-11-27 10:42:21
I'm looking at the AdventureWorks sample database for SQL Server 2008, and I see in their creation scripts that they tend to use the following: ALTER TABLE [Production].[ProductCostHistory] WITH CHECK ADD CONSTRAINT [FK_ProductCostHistory_Product_ProductID] FOREIGN KEY([ProductID]) REFERENCES [Production].[Product] ([ProductID]) GO followed immediately by : ALTER TABLE [Production].[ProductCostHistory] CHECK CONSTRAINT [FK_ProductCostHistory_Product_ProductID] GO I see this for foreign keys (as here), unique constraints and regular CHECK constraints; DEFAULT constraints use the regular format

SQL Sub queries in check constraint

由 廉价感情. 提交于 2019-11-27 09:00:33
Can I make SQL sub queries in Check constraint ? I've a post table with columns id, owner I've another table action with columns user_id, post_id Table user with columns id post_id -> post.id and user_id -> user.id also post.owner -> user.id Now I want to constraint post(post_id).id != user_id on table action How is that possible ? It is not supported to look beyond the current row in a CHECK constraint. http://www.postgresql.org/docs/9.1/interactive/sql-createtable.html says: A check constraint specified as a column constraint should reference that column's value only, while an expression

Check Constraints in Access

由 北慕城南 提交于 2019-11-27 08:18:30
问题 I'm working on an Access database , and I want to save a Check Constraint as a query. Is that even possible in Access ?? Anyhow, this is my Query: ALTER TABLE LEVERANCIER ADD CONSTRAINT chk_postcode CHECK( NOT EXISTS( SELECT levnr, postcode FROM LEVERANCIER WHERE Left(postcode, 4) = 5050 OR Woonplaats = "Amsterdam")); It does work in AnySQL Maestro, but it doesn't work in Access.. 回答1: The Access Database Engine does support CHECK constraints, but the DDL to create them cannot be executed

Simple CHECK Constraint not so simple

由 ▼魔方 西西 提交于 2019-11-27 04:40:47
问题 2nd Edit : The source code for the involved function is as follows: ALTER FUNCTION [Fileserver].[fn_CheckSingleFileSource] ( @fileId INT ) RETURNS INT AS BEGIN -- Declare the return variable here DECLARE @sourceCount INT ; -- Add the T-SQL statements to compute the return value here SELECT @sourceCount = COUNT(*) FROM Fileserver.FileUri WHERE FileId = @fileId AND FileUriTypeId = Fileserver.fn_Const_SourceFileUriTypeId() ; -- Return the result of the function RETURN @sourceCount ; END Edit :

Sub queries in check constraint

由 ☆樱花仙子☆ 提交于 2019-11-26 17:43:06
I have table designed in SQL-Server 2008 R2. I have a column in that table which needs to be checked against another table when data is inserting. ALTER TABLE Table1 WITH CHECK ADD CONSTRAINT CK_Code CHECK (MyField in (Select Field From Table2)) This cause an error Sub-queries are not allowed in this context. Only scalar expressions are allowed. I have looked at this question about Check Constraint - Subqueries are not allowed in this context . Is there any way of achieving this without using a trigger? Note, what you really want is a foreign key constraint. That said, to get a "query" into a

Oracle 11g - Check constraint with RegEx

由 坚强是说给别人听的谎言 提交于 2019-11-26 17:19:35
问题 I'm using Oracle 11g, and trying to create a table define constraints on the creation. I was trying to add check constraint to validate some information (like e-mail address, phone number, etc...) Is there something in Oracle 11g that would allow me to do something like this? constraint CK_CONSTRAINT_NAME check (EMAIL like 'REGEX') The regEx I wanted to use (grabbed from regexLib) is: ^[a-zA-Z][a-zA-Z0-9_\.\-]+@([a-zA-Z0-9-]{2,}\.)+([a-zA-Z]{2,4}|[a-zA-Z]{2}\.[a-zA-Z]{2})$ I think Oracle 11g

Date range overlapping check constraint

由 为君一笑 提交于 2019-11-26 16:33:27
问题 I've a simple table in sql server 2005 with 3 columns: DateStart, DateEnd and Value. I tried to set a "table check constraint" to avoid inserting overlapping records. For instance if in such table there is a record with DateStart = 2012-01-01 (first January) and DateEnd 2012-01-15 (15th January) than Check constraint must avoid inserting a record with DateStart=2012-01-10 (no care DateEnd), a record with DateEnd=2012-01-10 (no care DateStart) or a record with DateStart 2011-12-10 and DateEnd

WITH CHECK ADD CONSTRAINT followed by CHECK CONSTRAINT vs. ADD CONSTRAINT

由 梦想的初衷 提交于 2019-11-26 15:14:37
问题 I'm looking at the AdventureWorks sample database for SQL Server 2008, and I see in their creation scripts that they tend to use the following: ALTER TABLE [Production].[ProductCostHistory] WITH CHECK ADD CONSTRAINT [FK_ProductCostHistory_Product_ProductID] FOREIGN KEY([ProductID]) REFERENCES [Production].[Product] ([ProductID]) GO followed immediately by : ALTER TABLE [Production].[ProductCostHistory] CHECK CONSTRAINT [FK_ProductCostHistory_Product_ProductID] GO I see this for foreign keys
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