5 февр. 2010, в 10:02, Oleksandr Byelkin написал(а):
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Our syntax is
<type>  [GENERATED ALWAYS]  AS   ( <expression> )  [VIRTUAL | PERSISENT]

default is persistent. Syntax changed to be more compatible with MS SQL and Oracle

Sorry I forgot something:

<type>  [GENERATED ALWAYS]  AS   ( <expression> )  [VIRTUAL | PERSISENT]  [UNIQUE] [UNIQUE KEY] [COMMENT <text>]