BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Need SQL help          BorlandTalk.com Forum Index -> Delphi Databases (SQL Servers) View previous topic :: View next topic   Author Message Crazy Horse's crazier lit Guest Posted: Mon Mar 28, 2005 7:35 pm    Post subject: Need SQL help Help me, Rhonda! (or...), I want to retrieve a list of patients currently in the hospital. I can do this (I think) by comparing admit dates with departure dates-every patient who has an admit_date that is later than their most recent departure date is here. However, the SQL I've cobbled together is bad: I've tried all the derivations of the following I can think of, and nothing works: select p.firstname, p.lastname, a.admit_date, a.ADMISSION_ID, a.ADMIT_ORDINAL, d.departure_date from patient_admissions a join departures d on d.admission_id = a.ADMISSION_ID join patients p on p.PATIENT_ID = a.admission_id where max(a.admit_date) > max(d.DEPARTURE_DATE) --if I replace "where" with "having," that also fails. -- Download Blackbird Crow Raven's book "STILL CASTING SHADOWS: Two American Families 1620-2006" here: http://www.winsite.com/bin/Info?22000000036712 Back to top Eric Hill Guest Posted: Mon Mar 28, 2005 8:20 pm    Post subject: Re: Need SQL help Is the departure date filled in if the patient is still in the hospital? select * from ... where departure_date is null Eric Back to top Iman L Crawford Guest Posted: Mon Mar 28, 2005 9:42 pm    Post subject: Re: Need SQL help "Crazy Horse's crazier little brother" <cshannon (AT) d4sw (DOT) com> wrote in news:42485c8f$1 (AT) newsgroups (DOT) borland.com: Quote: select p.firstname, p.lastname, a.admit_date, a.ADMISSION_ID, a.ADMIT_ORDINAL, d.departure_date from patient_admissions a join departures d on d.admission_id = a.ADMISSION_ID join patients p on p.PATIENT_ID = a.admission_id where max(a.admit_date) > max(d.DEPARTURE_DATE) IIRC, you need a group by if you're using an aggregate function. -- Iman Back to top Barak zabari Guest Posted: Tue Mar 29, 2005 9:12 am    Post subject: Re: Need SQL help I assume that for each patient you have one record in admission table and one record in departure for each visit to the hospital (each Admission_Id) I assume that since the patient is still at the hospitale then you don't need the departure date (since he didn't left yet) base on that i think this should work select p.firstname, p.lastname, a.admit_date, a.ADMISSION_ID, a.ADMIT_ORDINAL from patient_admissions a join patients p on p.PATIENT_ID = a.admission_id Where not Exits (Select * from departures D Where d.admission_id = a.ADMISSION_ID And A.admit_date <d.DEPARTURE_DATE And d.DEPARTURE_DATE is not null) "Crazy Horse's crazier little brother" Quote: Help me, Rhonda! (or...), I want to retrieve a list of patients currently in the hospital. I can do this (I think) by comparing admit dates with departure dates-every patient who has an admit_date that is later than their most recent departure date is here. However, the SQL I've cobbled together is bad: I've tried all the derivations of the following I can think of, and nothing works: select p.firstname, p.lastname, a.admit_date, a.ADMISSION_ID, a.ADMIT_ORDINAL, d.departure_date from patient_admissions a join departures d on d.admission_id = a.ADMISSION_ID join patients p on p.PATIENT_ID = a.admission_id where max(a.admit_date) > max(d.DEPARTURE_DATE) --if I replace "where" with "having," that also fails. -- Download Blackbird Crow Raven's book "STILL CASTING SHADOWS: Two American Families 1620-2006" here: http://www.winsite.com/bin/Info?22000000036712 Back to top Wayne Niddery [TeamB] Guest Posted: Tue Mar 29, 2005 3:51 pm    Post subject: Re: Need SQL help Crazy Horse's crazier little brother wrote: Quote: I want to retrieve a list of patients currently in the hospital. I can do this (I think) by comparing admit dates with departure dates-every patient who has an admit_date that is later than their most recent departure date is here. However, the SQL I've cobbled together is bad: select p.firstname, p.lastname, a.admit_date, a.ADMISSION_ID, a.ADMIT_ORDINAL, d.departure_date from patient_admissions a join departures d on d.admission_id = a.ADMISSION_ID join patients p on p.PATIENT_ID = a.admission_id where max(a.admit_date) > max(d.DEPARTURE_DATE) What would make this easy is if there was some direct *unique* link between admissions and departures (i.e. not the patient id, but a separate admission id that is stored in the matching departure record). Then the SQL would be: select <fields> from patient_admissions a join patients p on p.PATIENT_ID = a.PATIENTID where not exists ( select 1 from departures d where d.admissionid = a.admission_id ) Assuming you do not have such a link then try: select p.firstname, p.lastname, a.ADMISSION_ID, a.ADMIT_ORDINAL, MAX(a.admit_date), MAX(d.departure_date) from patient_admissions a join departures d on d.admission_id = a.ADMISSION_ID join patients p on p.PATIENT_ID = a.admission_id GROUP BY p.firstname, p.lastname, a.ADMISSION_ID, a.ADMIT_ORDINAL where max(a.admit_date) > max(d.DEPARTURE_DATE) -- Wayne Niddery - Logic Fundamentals, Inc. (www.logicfundamentals.com) RADBooks: http://www.logicfundamentals.com/RADBooks.html "The two most abundant elements in the universe are hydrogen and stupidity." - Harlan Ellison Back to top Crazy Horse's crazier lit Guest Posted: Tue Mar 29, 2005 4:15 pm    Post subject: Re: Need SQL help "Wayne Niddery [TeamB]" <wniddery (AT) chaffaci (DOT) on.ca> wrote Quote: Assuming you do not have such a link then try: select p.firstname, p.lastname, a.ADMISSION_ID, a.ADMIT_ORDINAL, MAX(a.admit_date), MAX(d.departure_date) from patient_admissions a join departures d on d.admission_id = a.ADMISSION_ID join patients p on p.PATIENT_ID = a.admission_id GROUP BY p.firstname, p.lastname, a.ADMISSION_ID, a.ADMIT_ORDINAL where max(a.admit_date) > max(d.DEPARTURE_DATE) The latter SQL (quoted above) looked interesting, but when I plugged it into DBWB, I got "token unknown - line 7, char 2 where" -- Download Blackbird Crow Raven's book "STILL CASTING SHADOWS: Two American Families 1620-2006" here: http://www.winsite.com/bin/Info?22000000036712 Back to top Eric Hill Guest Posted: Tue Mar 29, 2005 4:23 pm    Post subject: Re: Need SQL help Quote: The latter SQL (quoted above) looked interesting, but when I plugged it into DBWB, I got "token unknown - line 7, char 2 where" Put the WHERE clause before the GROUP BY clause. Eric Back to top Patrick Guest Posted: Tue Mar 29, 2005 4:42 pm    Post subject: Re: Need SQL help And change it to HAVING "Eric Hill" <eric (AT) ijack (DOT) net> wrote Quote: The latter SQL (quoted above) looked interesting, but when I plugged it into DBWB, I got "token unknown - line 7, char 2 where" Put the WHERE clause before the GROUP BY clause. Eric Back to top Crazy Horse's crazier lit Guest Posted: Tue Mar 29, 2005 5:05 pm    Post subject: Re: Need SQL help "Patrick" <pdc (AT) novusprintmedia (DOT) com> wrote Quote: And change it to HAVING "Eric Hill" <eric (AT) ijack (DOT) net> wrote in message news:42498105 (AT) newsgroups (DOT) borland.com... The latter SQL (quoted above) looked interesting, but when I plugged it into DBWB, I got "token unknown - line 7, char 2 where" Put the WHERE clause before the GROUP BY clause. Then* I get "token unknown - line 7, char 2 group" * select p.firstname, p.lastname, a.ADMISSION_ID, a.ADMIT_ORDINAL, MAX(a.admit_date), MAX(d.departure_date) from patient_admissions a join departures d on d.admission_id = a.ADMISSION_ID join patients p on p.PATIENT_ID = a.admission_id having max(a.admit_date) > max(d.DEPARTURE_DATE) GROUP BY p.firstname, p.lastname, a.ADMISSION_ID, a.ADMIT_ORDINAL -- Download Blackbird Crow Raven's book "STILL CASTING SHADOWS: Two American Families 1620-2006" here: http://www.winsite.com/bin/Info?22000000036712 Back to top Iman L Crawford Guest Posted: Tue Mar 29, 2005 5:24 pm    Post subject: Re: Need SQL help "Crazy Horse's crazier little brother" <cshannon (AT) d4sw (DOT) com> wrote in news:42498acc (AT) newsgroups (DOT) borland.com: Quote: Then* I get "token unknown - line 7, char 2 group" HAVING clause follows the GROUP BY clause. You really should get a beginners guide to SQL, preferrably one directed toward the server you're using. -- Iman Back to top Wayne Niddery [TeamB] Guest Posted: Wed Mar 30, 2005 4:30 pm    Post subject: Re: Need SQL help Crazy Horse's crazier little brother wrote: Quote: Then* I get "token unknown - line 7, char 2 group" * select p.firstname, p.lastname, a.ADMISSION_ID, a.ADMIT_ORDINAL, MAX(a.admit_date), MAX(d.departure_date) from patient_admissions a join departures d on d.admission_id = a.ADMISSION_ID join patients p on p.PATIENT_ID = a.admission_id GROUP BY p.firstname, p.lastname, a.ADMISSION_ID, a.ADMIT_ORDINAL having max(a.admit_date) > max(d.DEPARTURE_DATE) -- Wayne Niddery - Logic Fundamentals, Inc. (www.logicfundamentals.com) RADBooks: http://www.logicfundamentals.com/RADBooks.html "The moment the idea is admitted into society that property is not as sacred as the laws of God and there is not a force of law and public justice to protect it, anarchy and tyranny commence." - John Adams Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Databases (SQL Servers) All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.