Re: Need SQL help, I'm stuck.
От | Robert B. Easter |
---|---|
Тема | Re: Need SQL help, I'm stuck. |
Дата | |
Msg-id | 200112102324.fBANO7W04623@comptechnews.com обсуждение исходный текст |
Ответ на | Need SQL help, I'm stuck. (Chris Albertson <chrisalbertson90278@yahoo.com>) |
Список | pgsql-general |
This seems to work: SELECT c1,c3,c4 from (select c1, max(c2) from t1 group by c1) as dt1 (c1,c2) natural left join t1; Bob > I want a SQL query that returns these rows > > a 3 derg hbg > b 1 cccc rth > c 2 derf ett > > All I can think of is > > SELECT C1, max(C2), C3, C4 FROM T1 GROUP BY C1; > > That does not work. What I really want is the values for C1, C3 > and C4 that are associated with the row containing the maximum > value of C2 for each group of like C1 values. I don't even need > to know what is max(C2). > > Can I join the table with itself somehow? See: "brain lock". > This should not be hard. > > > Thanks, > > > ===== > Chris Albertson > Home: 310-376-1029 chrisalbertson90278@yahoo.com > Cell: 310-990-7550 > Office: 310-336-5189 Christopher.J.Albertson@aero.org > > __________________________________________________ > Do You Yahoo!? > Send your FREE holiday greetings online! > http://greetings.yahoo.com > > ---------------------------(end of broadcast)--------------------------- > TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
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