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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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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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


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but keeping both feet on the ground wont get you anywhere w00t

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