SQL server will then use just the primary key on its queries. You are ready to go! share|improve this answer answered Mar 9 at 17:00 user565869 add a comment| up vote -1 down vote Don't use computed column as a primary key, very bad idea. One or more rows contain values violating non-null, unique, or foreign-key constraints24Change primary key column in SQL Server1NHibernate incorrectly creating ManyToMany table - Cannot define PRIMARY KEY constraint on nullable column
CaseID is simply a concatenation of Case_Code and ContactID. When setting up CaseID I created it as NOT NULL, PRIMARY KEY, and used the formula "[Case_Code] + CONVERT([varchar], [contactID], 0)". Neither Case_Code nor ContactID accepts nulls, so CaseID obviously does not. what was I going to say again? http://stackoverflow.com/questions/22815683/cannot-define-primary-key-constraint-on-nullable-column-when-column-is-already-n
To do this execute the following query ALTER TABLE tbl_name alter column column_name int NOT NULL After that you can apply a primary key on that same column. Next, you need to drop and recreate the calculated field, and finally you can recreate your PK. It could break more than it solves if module maintainers are expecting to be able to add null values and the schema for those modules wouldn't be updated. I believe the proposed patch is OK, but still tables created prior to the patch are, let's say, "wrong".
So, ContactID "25" working on case "ZZZ999" is given a CaseID of "ZZZ99925". PDF Downloads SQL Coding Standards SQL FAQ DownloadDownload SQL SERVER 2016 (FREE)Exclusive Newsletter SQL Interview Q & ASearch © 2016 All rights reserved. Should this be moved to a new issue? Cannot Insert The Value Null Into Column Sign in to make your opinion count.
Log in or register to post comments Comment #10 david_garcia CreditAttribution: david_garcia commented September 23, 2014 at 9:13pm Status: Active » Closed (fixed) Log in or register to post comments Add Could Not Create Constraint Or Index. See Previous Errors. See previous errors. Is it unethical to poorly translate an exam from Dutch to English and then present it to the English speaking students? http://stackoverflow.com/questions/15546405/cannot-define-primary-key-constraint-on-nullable-column-in-table I cannot see any benefit from using empid as the primary key.
Enable the flag module. 9. Alter Table Not Null Browse other questions tagged sql sql-server database or ask your own question. To do this execute the following query ALTER TABLE tbl_name alter column column_name int NOT NULL After that you can apply a primary key on that same column. You cannot vote within polls.
You cannot edit your own posts. Just make empid a computed column. Could Not Create Constraint. See Previous Errors. You cannot edit your own topics. Table Already Has A Primary Key Defined On It. Could Not Create Constraint Any help or ideas would be greatly appreciated.
What is the simplest way to put some text at the beginning of a line and to put some text at the center of the same line? Why should you never use a comp column as the PK? Server: Msg 1750, Level 16, State 1, Line 1 Could not create constraint. You cannot delete other posts. There Is Already An Object Named In The Database. Could Not Create Constraint
This is something you would NEVER want to do on production. Dr. Run your update 7. You may download attachments.
current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. String Or Binary Data Would Be Truncated. COMMENTS: * This is required at least when running with SQL Server, but I guess would do no harm on other databases. share|improve this answer answered Apr 6 '14 at 7:32 dean 6,6791617 1 Thanks for the response @dean.
Other error messages: Cannot drop the table Is not a constraint Create View or Function failed because no column name was specified Column is invalid in the select list because it If you don't like to write sql,too bad. –HLGEM Mar 21 '13 at 17:22 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote You could just I have created a computed column which is the PRIMARY KEY of this Cases table, called CaseID. Add Column In Sql You cannot send private messages.
To do this execute the following query ALTER TABLE tbl_name ADD PRIMARY KEY (column_name) I hope this will help you share|improve this answer edited Sep 16 '14 at 13:20 Kariem 1,44211841 I have created a computed column which is the PRIMARY KEY of this Cases table, called CaseID. You cannot delete your own posts. Edit with code: CREATE TABLE [dbo].[Cases]( [ContactID] [int] NOT NULL, [Case_Code] [varchar](16) NOT NULL, [Assigned_To] [varchar](100) NULL, [LEK_Interviewer] [varchar](255) NULL, [Case_Notes] [varchar](max) NULL, [IV_Status] [varchar](100) NULL, [IV_Quality] [numeric](18, 0) NULL, [IV_Date]
If the ANSI_NULL_DFLT_ON session setting is ON or the ANSI null default is set to true, then the nullability of the column will be set to NULL. Manish Sharma 50,127 views 10:23 Microsoft Access 2010 Tutorial 4 - Primary Keys, Foreign Keys and Common Fields - Duration: 4:45.