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Editorial Team
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Asked: 2026-05-22T15:10:23+00:00

For ex. My query : select * from (SELECT distinct b.lname||’ ‘||b.fname as Manager,b.EMPID

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For ex.
My query :

select * 
from 
    (SELECT distinct b.lname||' '||b.fname as "Manager",b.EMPID as "Mgrid" 
     from EMPLOYEE1) a, 
    (select lname,fname,empid from EMPLOYEE1) b 
where b.EMPID=a.MGRID)

is fetching

Manager           Mgrid    
----------------  -------- 
Farooque Umer     104      
Sontireddy Kiran  107      
Chopra Bhupendra  103

but I cant write :

select Manager, Mgrid 
from 
    (select distinct b.lname||' '||b.fname as "Manager",b.EMPID as "Mgrid" 
    from EMPLOYEE1) a, 
    (select lname,fname,empid 
    from EMPLOYEE1) b 
where b.EMPID=a.MGRID)

Error:

[Error] Script lines: 1-1 ————————–
ORA-00904: “MGRID”: invalid identifier

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1 Answer

  1. Editorial Team

    Because as soon as you start enclosing names in double quotes like “Mgrid” they becone case-sensitive. So don’t. Do this:

    select Manager, Mgrid 
from 
    (select distinct b.lname||' '||b.fname as Manager,b.EMPID as Mgrid 
    from EMPLOYEE1) a, 
    (select lname,fname,empid 
    from EMPLOYEE1) b 
where b.EMPID=a.MGRID)

    or if you really like case-sensitive names you must do this:

    select "Manager", "Mgrid" 
from 
    (select distinct b.lname||' '||b.fname as "Manager",b.EMPID as "Mgrid" 
    from EMPLOYEE1) a, 
    (select lname,fname,empid 
    from EMPLOYEE1) b 
where b.EMPID=a."Mgrid")
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