Thread: Like Command returning wrong result set
Hello group,
I’m writing a script and a bit confused on the results with the like command.
gm.title like 'CP_%'
The above command gives me records with titles like CP_40, CP_2, CP_23, etc.
gm.title like '%_CT'
The above command give me records with tiles like Quiz: RadiInterpretation w/ CBCT.
I was expecting it to return titles that contained *_CT, i.e. FX_CT or DR_CT. It’s as if it’s ignoring the underscore the way it would do if you were using ‘%CT’. Does it ignore the underscore when it’s right after the ‘%’?
Thanks,
-- Merlin
Merlin D. Tchouante, Sr. IT Enterprise Application Developer
Center for Information Technology Services (CITS)
601 West Lombard Street
Baltimore, Maryland 21201-1512
mtchouan@umaryland.edu
410-706-4489 * 410-706-1500 fax
Please send Blackboard questions to the CITS support email address: DL-CITSBbSupport@umaryland.edu
Please send Mediasite questions to the CITS support email address: DL-CITSMediasiteSupport@umaryland.edu
Attachment
Hello group,
I’m writing a script and a bit confused on the results with the like command.
gm.title like 'CP_%'
The above command gives me records with titles like CP_40, CP_2, CP_23, etc.
gm.title like '%_CT'
The above command give me records with tiles like Quiz: RadiInterpretation w/ CBCT.
I was expecting it to return titles that contained *_CT, i.e. FX_CT or DR_CT. It’s as if it’s ignoring the underscore the way it would do if you were using ‘%CT’. Does it ignore the underscore when it’s right after the ‘%’?
- Percent sign (
%
) matches any sequence of zero or more characters. - Underscore sign (
_
) matches any single character.
På torsdag 05. august 2021 kl. 16:00:38, skrev Tchouante, Merlin <mtchouan@umaryland.edu>:Hello group,
I’m writing a script and a bit confused on the results with the like command.
gm.title like 'CP_%'
The above command gives me records with titles like CP_40, CP_2, CP_23, etc.
gm.title like '%_CT'
The above command give me records with tiles like Quiz: RadiInterpretation w/ CBCT.
I was expecting it to return titles that contained *_CT, i.e. FX_CT or DR_CT. It’s as if it’s ignoring the underscore the way it would do if you were using ‘%CT’. Does it ignore the underscore when it’s right after the ‘%’?
- Percent sign (
%
) matches any sequence of zero or more characters.- Underscore sign (
_
) matches any single character.
--Andreas Joseph Krogh
> On Aug 5, 2021, at 07:00, Tchouante, Merlin <mtchouan@umaryland.edu> wrote: > > Hello group, > > I’m writing a script and a bit confused on the results with the like command. > > gm.title like 'CP_%' > > The above command gives me records with titles like CP_40, CP_2, CP_23, etc. > > gm.title like '%_CT' Somewhat confusingly, '_' is the single-character wildcard for SQL's LIKE operation: xof=# SELECT 'A' LIKE '_'; ?column? ---------- t (1 row) You can escape it to search for it literally: xof=# SELECT '_' LIKE '\_'; ?column? ---------- t (1 row) xof=# SELECT 'A' LIKE '\_'; ?column? ---------- f (1 row)
This worked, thank you so much; I'm still stuck in Oracle mode. Thank you to everyone that responded. Thanks, -- Merlin Merlin D. Tchouante, Sr. IT Enterprise Application Developer Center for Information Technology Services (CITS) 601 West Lombard Street Baltimore, Maryland 21201-1512 mtchouan@umaryland.edu 410-706-4489 * 410-706-1500 fax Please send Blackboard questions to the CITS support email address: DL-CITSBbSupport@umaryland.edu Please send Mediasite questions to the CITS support email address: DL-CITSMediasiteSupport@umaryland.edu -----Original Message----- From: Christophe Pettus <xof@thebuild.com> Sent: Thursday, August 5, 2021 10:05 AM To: Tchouante, Merlin <mtchouan@umaryland.edu> Cc: pgsql-sql@postgresql.org Subject: Re: Like Command returning wrong result set CAUTION: This message originated from a non-UMB email system. Hover over any links before clicking and use caution openingattachments. > On Aug 5, 2021, at 07:00, Tchouante, Merlin <mtchouan@umaryland.edu> wrote: > > Hello group, > > I’m writing a script and a bit confused on the results with the like command. > > gm.title like 'CP_%' > > The above command gives me records with titles like CP_40, CP_2, CP_23, etc. > > gm.title like '%_CT' Somewhat confusingly, '_' is the single-character wildcard for SQL's LIKE operation: xof=# SELECT 'A' LIKE '_'; ?column? ---------- t (1 row) You can escape it to search for it literally: xof=# SELECT '_' LIKE '\_'; ?column? ---------- t (1 row) xof=# SELECT 'A' LIKE '\_'; ?column? ---------- f (1 row)