I'm not that familiar with Oracle but based on this sqlFiddle, I can confirm to you that this does work:
sqlfiddle.com/#!4/c0be1c/19813
Ran in Oracle SQLDev:
begin if 'admin' = 'admin ' then dbms_output.put_line(1); else dbms_output.put_line(0); end if; end; Result: 1
It is correct that Oracle automatically trims leading and trailing spaces.
Edit: I should mention that this is on 18.2
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I'm not that familiar with Oracle but based on this sqlFiddle, I can confirm to you that this does work:
sqlfiddle.com/#!4/c0be1c/19813
Ran in Oracle SQLDev:
It is correct that Oracle automatically trims leading and trailing spaces.
Edit: I should mention that this is on 18.2