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Resolved Oracle question

  1. How-to
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  1. Miguel Leeuwe
    Miguel Leeuwe
  2. PowerBuilder
  3. Wednesday, 23 November 2022 11:08 AM UTC

Hi, 

I'm trying to do this in Oracle:

SELECT T.emm

 FROM (select '​abc' as emm from dual) T

where T.emm = 'abc'

ORDER BY T.emm;

 

I get no rows. 

When I leave out the WHERE phrase it works. Anyone any idea on why?

I've also tried the same thing with a WITH statement, but results are the same.

(I know this is an oracle question, but I'm still waiting for anyone to reply over there).

Oracle 19c.

 

TIA

MiguelL

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Accepted Answer
Andreas Mykonios
Andreas Mykonios Accepted Answer Pending Moderation
  1. Wednesday, 23 November 2022 11:22 AM UTC
  2. PowerBuilder
  3. # Permalink

Hi Miguel.

Very strange. Where did you typed "select '​abc' as emm from dual"? Your 'abc' has a hidden character just before a.

I execute:

SELECT
    '1st' descr,
    emm
FROM
    (
        SELECT
            '​abc' emm
        FROM
            dual
    ) t
WHERE
    emm = 'abc'
UNION
SELECT
    '2nd'   descr,
    '​abc'  emm
FROM
    dual
ORDER BY
    emm

This strangely returns '?abc'...

Andreas.

Comment
Miguel Leeuwe
  1. Miguel Leeuwe
  2. Wednesday, 23 November 2022 11:25 AM UTC
Hi Andreas,

I just received the same answer on the Oracle forum and you are right!.

I have no idea how that character has appeared there. I've copied some text from a result set in SQL Developer. That must be the culprit!

Thank you very much, problem solved.

regards,

MiguelL
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