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I'm trying to show only first result from this select, but cant figure out how to do it or what function should I use.

I have tried rownum <= 1, but it changed shown result.

select name || ' ' || surname as meno, role from system_user order by surname ASC ;
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In Oracle, you need to use a subquery:

select su.* from (select name || ' ' || surname as meno, role from system_user order by surname ASC ) su where rownum = 1;

The most recent versions of Oracle (12C) make this simpler by supporting the ANSI standard FETCH FIRST 1 ROW ONLY syntax:

select name || ' ' || surname as meno, role from system_user order by surname ASC fetch first 1 row only;
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