Question

I have this query:

select  BUnit, value from myTable where BUnit in (555,556,557,558)

and these values for Bunit are constructed dynamically, ie. a program builds queries on demand, and they won’t always select these numbers.

A possible query result would be

Bunit            value
556              10.2
558              5.18  

However, I would like to construct a select statement to return

Bunit            value
556              10.2
558              5.18  
555              NULL
557              NULL

I am not allowed to create tables (temporary or not) and to create procedures. How can I do it?

Answer 1

You can build a table with the criteria, and join on that:

select criteria.BUnit, t.value 
from (
    select 555 as BUnit from dual
    union select 556 from dual
    union select 557 from dual
    union select 558 from dual
) criteria
left join myTable t 
    on t.BUnit = criteria.BUnit