Want SQL query to be modified or corrected

Question

When I am running this query:

select sm.stylename, 
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Name') as "VENDOR NAME",
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Number') as "VENDOR NUMBER",
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Address') as "VENDOR ADDRESS",
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Name') as "FACTORY NAME",
(select fieldvalue from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Address') as "FACTORY ADDRESS"
from stylemaster sm order by sm.stylename;

I get the error message:

"ORA-01427: single-row subquery returns more than one row
01427. 00000-"single-row subquery returns more than one row"

Can you please help in resolving this issue?

Answer 1

One of your subqueries is returning more than one value. You can fix the symptom by adding where rownum = 1 or an aggregation function:

select sm.stylename, 
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Name') as "VENDOR NAME",
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Number') as "VENDOR NUMBER",
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Address') as "VENDOR ADDRESS",
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Name') as "FACTORY NAME",
       (select max(fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Address') as "FACTORY ADDRESS"
from stylemaster sm
order by sm.stylename;

That will get rid of the problem, but you might want to investigate why the duplicates are showing up to begin with.

EDIT:

If max() doesn't work on your data types, then use rownum = 1 :

select sm.stylename, 
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Name' and rownum = 1) as "VENDOR NAME",
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Number' and rownum = 1) as "VENDOR NUMBER",
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Vendor Address' and rownum = 1) as "VENDOR ADDRESS",
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Name' and rownum = 1) as "FACTORY NAME",
       (select (fieldvalue) from auxiliaryfield af where af.stylename = sm.stylename and fieldlabel = 'Factory Address' and rownum = 1) as "FACTORY ADDRESS"
from stylemaster sm
order by sm.stylename;