> -----Original Message----- > From: pgsql-general-ow...@postgresql.org [mailto:pgsql-general- > ow...@postgresql.org] On Behalf Of Andrus > Sent: Tuesday, December 22, 2009 12:03 PM > To: pgsql-general@postgresql.org > Subject: [GENERAL] How to add month.year column validation > > Database contains CHAR(7) type column which must be NOT NULL and must > be in > the format > > mm.yyyy > > where: > > mm - month number, always two digits in range 01 .. 12 > > . - separator must be point always. > > yyyy - must be four digits in range approx. 1980 .. 2110 . > > How to add column validation to table column which forces this ?
If you use a date (IOW, just always use a day of 1) then error detection is automatic. It also only consumes 4 bytes of storage. You can also use a check constraint, or create a domain. http://www.postgresql.org/docs/8.4/static/ddl-constraints.html http://www.postgresql.org/docs/current/static/sql-createdomain.html -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
