Sql alter table set field to not null

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  http://blog.sqlauthority.com/2008/03/19/sql-server-add-column-with-default-column-constraint-to-table/
ALTER TABLE only allows columns to be added that can contain nulls, or have a DEFAULT definition specified, or the column being added is an identity or timestamp column, or alternatively if none of the previous conditions are satisfied the table must be empty to allow addition of this column. Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account

sql server 2008 - Quickly change NULL column to NOT NULL - Database Administrators Stack Exchange

  http://dba.stackexchange.com/questions/48872/quickly-change-null-column-to-not-null
One problem with this is that even if you know the column in fact has no NULLs the constraint is not trusted by the query optimiser which means that the plans can be sub optimal. Adding the constraint with NOCHECK means that no rows will need to be read to verify it, and if you are starting from a position where the column does not contain NULL values (and if you know none will be added between checking and adding the constraint) then, as the constraint prevents NULL values being created from future INSERT or UPDATE operations, this will work

  http://sqlstudies.com/2013/10/30/adding-a-column-to-a-table-with-a-default-null-vs-not-null/
This -- Trying to add a NOT NULL column without a default ALTER TABLE DefaultTest ADD NotNull2 char(1) NOT NULL GO Returns an error of Msg 4901, Level 16, State 1, Line 1 ALTER TABLE only allows columns to be added that can contain nulls, or have a DEFAULT definition specified, or the column being added is an identity or timestamp column, or alternatively if none of the previous conditions are satisfied the table must be empty to allow addition of this column. Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account

  http://www.tek-tips.com/viewthread.cfm?qid=1304391
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sql server - Why does ALTER COLUMN to NOT NULL cause massive log file growth? - Database Administrators Stack Exchange

  http://dba.stackexchange.com/questions/29522/why-does-alter-column-to-not-null-cause-massive-log-file-growth
But it's clear that - while both the update operation and the addition of the NOT NULL constraint undeniably write to the page - the latter does so in an entirely different way. On databases with one of the snapshot isolation options enabled then the versioning information in each row is updated (@SQL Kiwi points out that this can also occur in databases without SI enabled as described here)