BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Sum Problem with NULL Values          BorlandTalk.com Forum Index -> Delphi Databases (SQL Servers) View previous topic :: View next topic   Author Message Stefan Deutschen Guest Posted: Wed Sep 10, 2003 9:36 am    Post subject: Sum Problem with NULL Values Hi folks (i don't know if this is the right newsgroup for this question, if so, please forgive me) I have a table ("ORDERS") which looks like this Order Serial FromCty ToCty Price 1000 1 washington NY 500 1000 2 washington LA 600 1001 1 washington NY 550 1002 1 washington NY 525 i want to display all the FromCty->ToCty for the user grouped with summed prices; problem here is that i have to display From-To's in only one row. i do this with an inner join wich goes (not exactly) like: SELECT COUNT(a.ORDER), a.FROMCTY, a.TOCTY, b.TOCITY2 FROM ORDERS A INNER JOIN ORDERS b ON a.ORDER = b.ORDER AND b.SERIAL = 2 AND a.TOCTY <> b.TOCTY GROUP BY a.FROMCTY, a.TOCTY, b.TOCTY with this, i'd get a result set like: Count FromCty ToCty ToCty2 1 washington NY LA 2 washington NY NULL so far, so good but i also need the avg. and the max price for each From-To For the first one, avg and max would be 1100, as it is only one (i have to add serial 2) for the second one, avg = 537,5, max = 550 how can i get this??? i tried different things, but as i have to sum up a.price and b.price (in case there is a serial 2) i always get SUM = NULL in case there is no second serial, because SUM(a.PRICE) + SUM(b.PRICE) is 550+525+NULL+NULL and if you have a NULL Value in a SUM statement, the result will be NULL. Is there a way to use a CASE within the SUM brackets? Or a completely different way? Thx in advance for your help Stefan Deutschen Back to top Stefan Deutschen Guest Posted: Thu Sep 11, 2003 6:27 am    Post subject: Re: Sum Problem with NULL Values Microsoft SQL 2000 SP 3 "Alain Quesnel" <alainsansspam (AT) logiquel (DOT) com> schrieb im Newsbeitrag news:3f5f7f17$1 (AT) newsgroups (DOT) borland.com... Quote: What database are you using? -- Alain Quesnel [email]alainsansspam (AT) logiquel (DOT) com[/email] www.logiquel.com "Stefan Deutschen" <sdeutschen (AT) fixemer (DOT) de> wrote in message news:3f5ef091 (AT) newsgroups (DOT) borland.com... Hi folks (i don't know if this is the right newsgroup for this question, if so, please forgive me) I have a table ("ORDERS") which looks like this Order Serial FromCty ToCty Price 1000 1 washington NY 500 1000 2 washington LA 600 1001 1 washington NY 550 1002 1 washington NY 525 i want to display all the FromCty->ToCty for the user grouped with summed prices; problem here is that i have to display From-To's in only one row. i do this with an inner join wich goes (not exactly) like: SELECT COUNT(a.ORDER), a.FROMCTY, a.TOCTY, b.TOCITY2 FROM ORDERS A INNER JOIN ORDERS b ON a.ORDER = b.ORDER AND b.SERIAL = 2 AND a.TOCTY b.TOCTY GROUP BY a.FROMCTY, a.TOCTY, b.TOCTY with this, i'd get a result set like: Count FromCty ToCty ToCty2 1 washington NY LA 2 washington NY NULL so far, so good but i also need the avg. and the max price for each From-To For the first one, avg and max would be 1100, as it is only one (i have to add serial 2) for the second one, avg = 537,5, max = 550 how can i get this??? i tried different things, but as i have to sum up a.price and b.price (in case there is a serial 2) i always get SUM = NULL in case there is no second serial, because SUM(a.PRICE) + SUM(b.PRICE) is 550+525+NULL+NULL and if you have a NULL Value in a SUM statement, the result will be NULL. Is there a way to use a CASE within the SUM brackets? Or a completely different way? Thx in advance for your help Stefan Deutschen Back to top Vitali Kalinin Guest Posted: Thu Sep 11, 2003 8:41 am    Post subject: Re: Sum Problem with NULL Values Look for IsNull in Books Online "Stefan Deutschen" <sdeutschen (AT) fixemer (DOT) de> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:3f5ef091 (AT) newsgroups (DOT) borland.com... Quote: Hi folks (i don't know if this is the right newsgroup for this question, if so, please forgive me) I have a table ("ORDERS") which looks like this Order Serial FromCty ToCty Price 1000 1 washington NY 500 1000 2 washington LA 600 1001 1 washington NY 550 1002 1 washington NY 525 i want to display all the FromCty->ToCty for the user grouped with summed prices; problem here is that i have to display From-To's in only one row. i do this with an inner join wich goes (not exactly) like: SELECT COUNT(a.ORDER), a.FROMCTY, a.TOCTY, b.TOCITY2 FROM ORDERS A INNER JOIN ORDERS b ON a.ORDER = b.ORDER AND b.SERIAL = 2 AND a.TOCTY b.TOCTY GROUP BY a.FROMCTY, a.TOCTY, b.TOCTY with this, i'd get a result set like: Count FromCty ToCty ToCty2 1 washington NY LA 2 washington NY NULL so far, so good but i also need the avg. and the max price for each From-To For the first one, avg and max would be 1100, as it is only one (i have to add serial 2) for the second one, avg = 537,5, max = 550 how can i get this??? i tried different things, but as i have to sum up a.price and b.price (in case there is a serial 2) i always get SUM = NULL in case there is no second serial, because SUM(a.PRICE) + SUM(b.PRICE) is 550+525+NULL+NULL and if you have a NULL Value in a SUM statement, the result will be NULL. Is there a way to use a CASE within the SUM brackets? Or a completely different way? Thx in advance for your help Stefan Deutschen Back to top Lester Hanger Guest Posted: Fri Sep 12, 2003 9:49 pm    Post subject: Re: Sum Problem with NULL Values Stefan Deutschen <sdeutschen (AT) fixemer (DOT) de> wrote Quote: how can i get this??? i tried different things, but as i have to sum up a.price and b.price (in case there is a serial 2) i always get SUM = NULL in case there is no second serial, because SUM(a.PRICE) + SUM(b.PRICE) is 550+525+NULL+NULL and if you have a NULL Value in a SUM statement, the result will be NULL. Is there a way to use a CASE within the SUM brackets? Or a completely different way? You should be able to use SUM(ISNULL(a.PRICE, 0)) ISNULL(x, v) returns x if x is not NULL, else v if x is NULL. Back to top Robert Cerny Guest Posted: Mon Sep 15, 2003 6:20 pm    Post subject: Re: Sum Problem with NULL Values Your problem is somewhere else. 1. aggregate functions skip null values 2. The query: SELECT * FROM ORDERS A INNER JOIN ORDERS b ON a.ORDER = b.ORDER AND b.SERIAL = 2 AND a.TOCTY <> b.TOCTY returns exacly one record, so does the aggregate query, if you remove "AND b.SERIAL = 2" you get 2 records, aggregate query also, both records having count 1. This is perfectly normal, since it's INNER JOIN. 3. What's the expression for max and avg? The only way you can get 1100 is max(a.price+b.price) You get sum=null only if all values are null. sum(500+600+null+null)=sum(500+600)=1100 avg(500+600+null+null)=avg(500+600)=550 sum(500+600)+sum(null+null)=1100+null=null -- Robert Cerny DelphiShaman "Stefan Deutschen" <sdeutschen (AT) fixemer (DOT) de> wrote Quote: Hi folks (i don't know if this is the right newsgroup for this question, if so, please forgive me) I have a table ("ORDERS") which looks like this Order Serial FromCty ToCty Price 1000 1 washington NY 500 1000 2 washington LA 600 1001 1 washington NY 550 1002 1 washington NY 525 i want to display all the FromCty->ToCty for the user grouped with summed prices; problem here is that i have to display From-To's in only one row. i do this with an inner join wich goes (not exactly) like: SELECT COUNT(a.ORDER), a.FROMCTY, a.TOCTY, b.TOCITY2 FROM ORDERS A INNER JOIN ORDERS b ON a.ORDER = b.ORDER AND b.SERIAL = 2 AND a.TOCTY b.TOCTY GROUP BY a.FROMCTY, a.TOCTY, b.TOCTY with this, i'd get a result set like: Count FromCty ToCty ToCty2 1 washington NY LA 2 washington NY NULL so far, so good but i also need the avg. and the max price for each From-To For the first one, avg and max would be 1100, as it is only one (i have to add serial 2) for the second one, avg = 537,5, max = 550 how can i get this??? i tried different things, but as i have to sum up a.price and b.price (in case there is a serial 2) i always get SUM = NULL in case there is no second serial, because SUM(a.PRICE) + SUM(b.PRICE) is 550+525+NULL+NULL and if you have a NULL Value in a SUM statement, the result will be NULL. Is there a way to use a CASE within the SUM brackets? Or a completely different way? 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