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Help with a if statement

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  #1  
Old December 2nd, 2011, 06:48 AM
Coe1ho Coe1ho is offline
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Help with a if statement
hey guys, i'm new here and am stuck with a bit of sql.

i've got a project and im wondering whether it is possible to create an if statement that says something like

"If column A is NOT NULL then column B cannot be NULL"

would I have to do this as a trigger or a constraint? any help would be greatly appreciated!

cheers
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  #2  
Old December 2nd, 2011, 07:13 AM
shammat shammat is offline
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Code:
CREATE TABLE foobar
(
   foo integer,
   bar integer,
   constraint check_not_null check (foo is null or (foo is not null and bar is not null))
);
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Old December 2nd, 2011, 07:37 AM
Coe1ho Coe1ho is offline
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thanks, works fine
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