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Adding a new NOT NULL field to an existing table


Adding a new NOT NULL field to an existing table

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muthukrishnan.e
muthukrishnan.e
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Adding a new NOT NULL field to an existing table
Chandra Sekhara Vyas Dhara
Chandra Sekhara Vyas Dhara
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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.



Jeff Moden
Jeff Moden
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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

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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russell-154600
russell-154600
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one other approach is to give it a default value, then drop the default constraint.
ALZDBA
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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 !

Johan


Don't drive faster than your guardian angel can fly ...
but keeping both feet on the ground won't get you anywhere w00t

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