On 23/09/2009 11:23, 纪晓曦 wrote:
> I want detail usage introduction about constraint,such as how to
> constrain a string to be exactly 4 character and start with 'z'.
> Where can I find the reference of CHECK? detail usage.
Try the documentation, presumably under CREATE TABLE:
http://www.postgresql.org/docs
Ray.
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Raymond O'Donnell, Director of Music, Galway Cathedral, Ireland
rod@iol.ie
Galway Cathedral Recitals: http://www.galwaycathedral.org/recitals
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