Oracle SELECT from multiple tables problem











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Can get all queries to work in an assignment but the last one of 28




  1. Write a query to show the Task Id, Max Hours and Actual Hours for all task


TASK
taskid (pk)
taskname
givendate
startdate
enddate
maxhours



JOB
taskid (pk,fk)
empid (pk,fk)
hoursspent



Actual hours is hoursspent



It has me stumped, having no trouble with other JOINS but cant get this one to work without column ambigiously defined!






oracle







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  • Please edit the question, and show example data, expected output, and what you have tried. Thanks
    – OldProgrammer
    Nov 19 at 1:19






  • 1




    hint: research group by and max() & sum() , if joins are no problem it is the group by clause that you now need (it comes after the where clause)
    – Used_By_Already
    Nov 19 at 1:48












  • your last comment about ambiguously defined columns suggests you have the same named field in both tables, therefor you need to fully qualify these fields (eg tablename.fieldname not just fieldname). Also have a look at aliasing your tables to save yourself some typing. In most of my roles fully qualifying all fields is a standard to ensure that these problems do not happen.
    – Shaun Peterson
    Nov 19 at 3:38










  • Thanks, will try some research and attempt some more options at school tomorrow
    – Mike Green
    Nov 20 at 3:47















up vote
0
down vote

favorite












Can get all queries to work in an assignment but the last one of 28




  1. Write a query to show the Task Id, Max Hours and Actual Hours for all task


TASK
taskid (pk)
taskname
givendate
startdate
enddate
maxhours



JOB
taskid (pk,fk)
empid (pk,fk)
hoursspent



Actual hours is hoursspent



It has me stumped, having no trouble with other JOINS but cant get this one to work without column ambigiously defined!






oracle







share|improve this question






















  • Please edit the question, and show example data, expected output, and what you have tried. Thanks
    – OldProgrammer
    Nov 19 at 1:19






  • 1




    hint: research group by and max() & sum() , if joins are no problem it is the group by clause that you now need (it comes after the where clause)
    – Used_By_Already
    Nov 19 at 1:48












  • your last comment about ambiguously defined columns suggests you have the same named field in both tables, therefor you need to fully qualify these fields (eg tablename.fieldname not just fieldname). Also have a look at aliasing your tables to save yourself some typing. In most of my roles fully qualifying all fields is a standard to ensure that these problems do not happen.
    – Shaun Peterson
    Nov 19 at 3:38










  • Thanks, will try some research and attempt some more options at school tomorrow
    – Mike Green
    Nov 20 at 3:47













up vote
0
down vote

favorite









up vote
0
down vote

favorite











Can get all queries to work in an assignment but the last one of 28




  1. Write a query to show the Task Id, Max Hours and Actual Hours for all task


TASK
taskid (pk)
taskname
givendate
startdate
enddate
maxhours



JOB
taskid (pk,fk)
empid (pk,fk)
hoursspent



Actual hours is hoursspent



It has me stumped, having no trouble with other JOINS but cant get this one to work without column ambigiously defined!






oracle







share|improve this question













Can get all queries to work in an assignment but the last one of 28




  1. Write a query to show the Task Id, Max Hours and Actual Hours for all task


TASK
taskid (pk)
taskname
givendate
startdate
enddate
maxhours



JOB
taskid (pk,fk)
empid (pk,fk)
hoursspent



Actual hours is hoursspent



It has me stumped, having no trouble with other JOINS but cant get this one to work without column ambigiously defined!






oracle




oracle






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 19 at 0:58









Mike Green

1




1












  • Please edit the question, and show example data, expected output, and what you have tried. Thanks
    – OldProgrammer
    Nov 19 at 1:19






  • 1




    hint: research group by and max() & sum() , if joins are no problem it is the group by clause that you now need (it comes after the where clause)
    – Used_By_Already
    Nov 19 at 1:48












  • your last comment about ambiguously defined columns suggests you have the same named field in both tables, therefor you need to fully qualify these fields (eg tablename.fieldname not just fieldname). Also have a look at aliasing your tables to save yourself some typing. In most of my roles fully qualifying all fields is a standard to ensure that these problems do not happen.
    – Shaun Peterson
    Nov 19 at 3:38










  • Thanks, will try some research and attempt some more options at school tomorrow
    – Mike Green
    Nov 20 at 3:47


















  • Please edit the question, and show example data, expected output, and what you have tried. Thanks
    – OldProgrammer
    Nov 19 at 1:19






  • 1




    hint: research group by and max() & sum() , if joins are no problem it is the group by clause that you now need (it comes after the where clause)
    – Used_By_Already
    Nov 19 at 1:48












  • your last comment about ambiguously defined columns suggests you have the same named field in both tables, therefor you need to fully qualify these fields (eg tablename.fieldname not just fieldname). Also have a look at aliasing your tables to save yourself some typing. In most of my roles fully qualifying all fields is a standard to ensure that these problems do not happen.
    – Shaun Peterson
    Nov 19 at 3:38










  • Thanks, will try some research and attempt some more options at school tomorrow
    – Mike Green
    Nov 20 at 3:47
















Please edit the question, and show example data, expected output, and what you have tried. Thanks
– OldProgrammer
Nov 19 at 1:19




Please edit the question, and show example data, expected output, and what you have tried. Thanks
– OldProgrammer
Nov 19 at 1:19




1




1




hint: research group by and max() & sum() , if joins are no problem it is the group by clause that you now need (it comes after the where clause)
– Used_By_Already
Nov 19 at 1:48






hint: research group by and max() & sum() , if joins are no problem it is the group by clause that you now need (it comes after the where clause)
– Used_By_Already
Nov 19 at 1:48














your last comment about ambiguously defined columns suggests you have the same named field in both tables, therefor you need to fully qualify these fields (eg tablename.fieldname not just fieldname). Also have a look at aliasing your tables to save yourself some typing. In most of my roles fully qualifying all fields is a standard to ensure that these problems do not happen.
– Shaun Peterson
Nov 19 at 3:38




your last comment about ambiguously defined columns suggests you have the same named field in both tables, therefor you need to fully qualify these fields (eg tablename.fieldname not just fieldname). Also have a look at aliasing your tables to save yourself some typing. In most of my roles fully qualifying all fields is a standard to ensure that these problems do not happen.
– Shaun Peterson
Nov 19 at 3:38












Thanks, will try some research and attempt some more options at school tomorrow
– Mike Green
Nov 20 at 3:47




Thanks, will try some research and attempt some more options at school tomorrow
– Mike Green
Nov 20 at 3:47

















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