sql server - How to change a normal column to "computed" column -

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i have table in mssql server 2008. change 1 of column in table computed column. tell me how do ?

preserve the old data:

exec sp_rename 'mytable.oldcol', 'renamedoldcol', 'column';

add computed column

alter table mytable add computedcol (some expression);

then, when you're happy

alter table mytable drop column renamedoldcol;

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