Subject: Credential Consultation: View Updated Report

From: View Anyone's Criminal History <[email-masked]>
Date: Tue, 19 Aug 2014 07:37:23 -0700

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Keep in mind that if the column is nullable, then null will be the value used for existing rows.   Richard Collette Jan 31 '12 at 15:43
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@RichardCollette what is nullable column. If my data type is int or varchar, it always takes null value for the existing rows even if I specify a default value. Does that mean the default value goes towards new records only?   Nick Feb 3 '12 at 15:04 
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@Thecrocodilehunter Nullable column means that you can insert Null for the columns value. If it's not a nullable column, you have to insert some value of that data type. So, for existing records, Null will be inserted in them and in new records, your default value will be inserted unless otherwise specified. Make sense?  like this answer a little better than dbugger's because it explicitly names the default constraint. A default constraint is still created using dbugger's syntax, except its name is auto-generated. Knowing the exact name is handy when writing DROP-CREATE scripts.   Walter Stabosz Mar 23 '12 at 12:43
  	 	
This is not correct. If you specify a default value using the DEFAULT constraint, it will be used as value for existing rows, at least in SQL Server 2008   Vertigo Jun 18 '12 at 11:04 
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@Vertigo That is ONLY true if the column is NOT NULL. Please try this: create table blah(a int not null primary key clustered); insert blah values (1), (2); alter table blah add b int null constraint df_blah_b default (0); select * from blah; You will see 2 NULL values for column b.   ErikE Jun 14 '13 at 22:19
  	 	
Alter the column to NOT NULL with a DEFAULT value. Then, with a second query, make the column nullable. Problem solved. 1st query adds your default values. 2nd allows allows nulls in the future.   Buttle Butkus Mar 26 at 20:20 
  	 	
Use WITH VALUES to update existing nullable rows. See MSDN: "If the added column allows null values and WITH VALUES is specified, the default value is stored in the new column, added to existing ro