Oracle SQL to find mixed case string values

Hello Experts,

I'm trying to find values for a specific string field in an Oracle 12c database that contains mixed case letters. Can anyone help me with the correct syntax for accomplishing this? My field name is "dc.dscr". Thank you.
Janice SmithSystems AnalystAsked:
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awking00Commented:
Can you provide a little more definition on the kind of strings that meet you meaning of mixed case? (e.g. upper and lower case in the same word or capitalized words in the middle of a sentence, etc.)?
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sdstuberCommented:
mixed case would mean it's not ALL-UPPER nor  ALL-LOWER.


select * from yourtable
where not (upper("dc.dscr") = "dc.dscr" or lower("dc.dscr") = "dc.dscr")

As a side node, if you can avoid it, I recommend not using quote-enclosed column names.
It's non-standard and makes your coding more cumbersome to use.
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Janice SmithSystems AnalystAuthor Commented:
I tried using:

 select * from dktcd dc
where not (upper('dc.dscr') = 'dc.dscr' or lower('dc.dscr') = 'dc.dscr')

but nothing is returned.

I want to be able to pull string values like the following:

Defendant ordered to attend Alcoholics Anonymous meetings ___ times per week.
Administrative license suspension (ALS) terminated.
Attorney of record is: ________________.

as opposed to just something like DEFT TO BE ASSESSED WHILE IN CUSTODY
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awking00Commented:
Are you just trying to retrieve strings that are not all upper or lower case? If so ,then slight revision to sdstuber's method -
where dc.dscr != upper(dc.dscr) or dc.dscr != lower(dc.dscr)
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Abhimanyu SuriSr Database EngineerCommented:
select 'Defendant ordered to attend Alcoholics Anonymous meetings ___ times per week.
Administrative license suspension (ALS) terminated.
Attorney of record is: ________________.' from dual


select * from v$sqlarea where upper(sql_text) like upper('%Defendant ordered%')

Above is an example, by putting upper on both sides, I was able to fetch the entire string.

Please note that using upper may degrade performance.
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sdstuberCommented:
you changed what I posted  (note you changed double quotes, to single quotes) , but based on your change, I'm going to guess you want this

 select * from dktcd dc
 where not (upper(dc.dscr) = dc.dscr or lower(dc.dscr) = dc.dscr)
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sdstuberCommented:
but just in case the double quotes are required try this...    

 select * from dktcd dc
  where not (upper(dc."dscr") = dc."dscr" or lower(dc."dscr") = dc."dscr")


(again, don't try changing double quotes to single quotes)
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sdstuberCommented:
also note,  awking00's  "slight revision" of my query  does NOT work.

EVERY not null string will always be found by that revision.

use one of the versions I posted.

rearranging the conditiosn of my query would use "and" not "or"  between the two negations

select * from dktcd dc
where dc.dscr != upper(dc.dscr) and dc.dscr != lower(dc.dscr)
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Janice SmithSystems AnalystAuthor Commented:
Ok, I tried using

select * from dktcd dc
 where not (upper(dc.dscr) = dc.dscr or lower(dc.dscr) = dc.dscr)

without any quotes and it works as desired. Thank you very much! I thought I needed to include the quotes for some reason.

I also tried using

select * from dktcd dc
 where dc.dscr != upper(dc.dscr) or dc.dscr != lower(dc.dscr)

but it returns values with all upper case letters in addition to values with upper and lower case letters.
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awking00Commented:
Should have been AND and not OR :-(
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Janice SmithSystems AnalystAuthor Commented:
Thank you everyone for your help.
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