Re: [SQL] SQL command join question
"Ehab Galal" <[EMAIL PROTECTED]> writes: > SELECT t1.* > FROM (t1 outer join t2 on (t1.a=t2.a and t1.b=t2.b)) t outer join t3 on > (t1.c=t3.c); > ERROR: invalid reference to FROM-clause entry for table "t1" > HINT: There is an entry for table "t1", but it cannot be referenced from > this part of the query. Drop the alias on the outer join (the "t"). Per SQL spec, that masks table names (and aliases) within the join from the rest of the query. regards, tom lane ---(end of broadcast)--- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate
Re: [SQL] SQL command join question
> SELECT t1.* > FROM (t1 outer join t2 on (t1.a=t2.a and t1.b=t2.b)) t outer join t3 on ^^ > (t1.c=t3.c); ^^ -- which one t or t1? > I'm getting the following error message: > ERROR: invalid reference to FROM-clause entry for table "t1" > HINT: There is an entry for table "t1", but it cannot be referenced from > this part of the query. I am not use if I am about to give to the correct advice, but here is what stands out at me: when you specify an outer join, I believe that you have to specify whether it is a (left|right|full). Also you are using a "t" to alias the (t1 .. t2 on (...)). First of all, I am not sure this is good syntax, but if I am wrong I will have learned something new. That aside, if it is legal syntax, I don't believe that you can refer to any of it's enternal tables any more. So (t1.c=...) should really be (t.c=...). this is what I expect would work: select * from t1 left outer join t2 on ((t1.a,t1.b) = (t2.a,t2.b)) left outer join t3 on (t1.c = t3.c) ; Regards, Richard Broersma Jr. ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
Re: [SQL] SQL command join question
On Wed, 29 Nov 2006, Ehab Galal wrote: > I have three tables t1(a, b, c, d), t2(a, b, c, k), and t3(c, e). I need to > outer join them as shown below, but only have all tuples from t1 as output. > But the following syntax does not allow me to do so. > > SELECT t1.* > FROM (t1 outer join t2 on (t1.a=t2.a and t1.b=t2.b)) t outer join t3 on > (t1.c=t3.c); I think you don't want to alias the output of the t1/t2 join to t if you're planning to continue referring to t1 in the rest of the query since I think the alias is going to hide the original t1 name. I'm not sure which outer join you were trying to use, but assuming left for now, I think something like SELECT t1.* FROM t1 left outer join t2 on (t1.a=t2.a and t1.b=t2.b ) left outer join t3 on (t1.c=t3.c); might work for you. ---(end of broadcast)--- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
Re: [SQL] SQL command join question
Would this be more appropriate...? SELECT t1.* FROM t1 OUTER JOIN t2 ON (t1.a=t2.a AND t1.b=t2.b) OUTER JOIN t3 ON (t1.c=t3.c); -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ehab Galal Sent: Thursday, 30 November 2006 11:42 To: pgsql-sql@postgresql.org Subject: [SQL] SQL command join question Hi, I have three tables t1(a, b, c, d), t2(a, b, c, k), and t3(c, e). I need to outer join them as shown below, but only have all tuples from t1 as output. But the following syntax does not allow me to do so. SELECT t1.* FROM (t1 outer join t2 on (t1.a=t2.a and t1.b=t2.b)) t outer join t3 on (t1.c=t3.c); I'm getting the following error message: ERROR: invalid reference to FROM-clause entry for table "t1" HINT: There is an entry for table "t1", but it cannot be referenced from this part of the query. I'll be grateful if someone may help me with this. Thanks, Ehab _ Fixing up the home? Live Search can help http://imagine-windowslive.com/search/kits/default.aspx?kit=improve&locale=e n-US&source=hmemailtaglinenov06&FORM=WLMTAG ---(end of broadcast)--- TIP 6: explain analyze is your friend ***Confidentiality and Privilege Notice*** The material contained in this message is privileged and confidential to the addressee. If you are not the addressee indicated in this message or responsible for delivery of the message to such person, you may not copy or deliver this message to anyone, and you should destroy it and kindly notify the sender by reply email. Information in this message that does not relate to the official business of Weatherbeeta must be treated as neither given nor endorsed by Weatherbeeta. Weatherbeeta, its employees, contractors or associates shall not be liable for direct, indirect or consequential loss arising from transmission of this message or any attachments ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
[SQL] SQL command join question
Hi, I have three tables t1(a, b, c, d), t2(a, b, c, k), and t3(c, e). I need to outer join them as shown below, but only have all tuples from t1 as output. But the following syntax does not allow me to do so. SELECT t1.* FROM (t1 outer join t2 on (t1.a=t2.a and t1.b=t2.b)) t outer join t3 on (t1.c=t3.c); I'm getting the following error message: ERROR: invalid reference to FROM-clause entry for table "t1" HINT: There is an entry for table "t1", but it cannot be referenced from this part of the query. I'll be grateful if someone may help me with this. Thanks, Ehab _ Fixing up the home? Live Search can help http://imagine-windowslive.com/search/kits/default.aspx?kit=improve&locale=en-US&source=hmemailtaglinenov06&FORM=WLMTAG ---(end of broadcast)--- TIP 6: explain analyze is your friend