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Adding a new NOT NULL field to an existing table Expand / Collapse
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Posted Tuesday, January 22, 2008 9:32 PM
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Adding a new NOT NULL field to an existing table
Post #446220
Posted Tuesday, January 22, 2008 10:02 PM
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If any data existing in the table copy the same into a temparory table. Delete the records in the table and alter the table. Insert the records into table from temporary table.


Post #446227
Posted Tuesday, January 22, 2008 10:07 PM


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Just add the column as a nullable column. Then populate it. When you're done, alter the column to be not null.

--Jeff Moden
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Post #446231
Posted Tuesday, January 22, 2008 10:09 PM
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one other approach is to give it a default value, then drop the default constraint.
Post #446232
Posted Wednesday, January 23, 2008 12:33 AM


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if you use
alter table xyz add mycol int not null default 0

keep in mind to rebuild your indexes afterward because your clusterratio may be horrible !


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