On Thu, 2016-09-01 at 12:28 +0300, Michelle Konzack wrote: > Hello to all, > > after a period of silence from Debian, Courier, PHP and PostgreSQL > I am > half back and running into a problem... :-/ > > I need a table with an UNIQUE CustomerID which is working fine... > > ...BUT I need also a second column with a count, > which must be UNIQUE > inside the CustomerID. > > In clear this: > > CustID Count > 1 1 > 1 2 > 1 3 > > 2 1 > 2 2 > > 3 1 > 3 2 > 3 3 > ... > > How to do this? > > Thanks in avance > > -- > Michelle Konzack ITSystems > GNU/Linux Developer 0033-6-61925193 > > Hi, (I wouldn't name a column "count"). SELECT MAX(count_er) FROM my_customer_table WHERE cust_id = $1; Add one to the result. Do INSERT. As SELECT MAX is a GROUP function it will return zero if the cust_id doesn't exist. HTH, Rob -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
