ORA-00942表或视图不存在

Question

I have a sql query in db oracle I want to output max value. SQL query contains unique field values

Sql query below contains duplicate rows:

select 
field1,field2,field3,field4,field5,field6,field7,field8,field9,MAX(field10) as field10

from(

select 
field1,field2,field3,field4,field5,field6,field7,field8,field9,field10

from table

)tabl

GROUP BY field1,field2,field3,field4,field5,field6,field7,field8,field9

I corrected sql request but it doesn't work.
Sql query below an error message is displayed :ORA-00942 table or view does not exist.

select

field1,field2,field3,field4,field5,field6,field7,field8,field9

,(SELECT MAX(field10)  FROM tabl ) as field10

from(
select 
field1,field2,field3,field4,field5,field6,field7,field8,field9,field10

from table
)tabl

how can i fix it? Thanks for your help!

Answer 1

First of all, your first query have duplicates, as you are grouping by all columns and using aggregate function of remaining column, field10 .

Now coming back you your error. The reason for error is ,(SELECT MAX(field10) FROM tabl ) as field10 . Because tabl is an alias for outer table and you are using it inside the select clause, hence the error.

Also you can further simplify it like below and it will also not give you duplicates.

select 
field1,field2,field3,field4,field5,field6,
  field7,field8,field9,MAX(field10) as field10
from table
GROUP BY field1,field2,field3,field4,field5,field6,
 field7,field8,field9