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Simple pass thru query
Simple pass thru query
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Phunhog
Phunhog
Posted Monday, August 20, 2012 2:48 PM
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Last Login: Tuesday, January 29, 2013 12:34 PM
Points: 36,
Visits: 203
Hello Oracle Forum:
I've got my first linked server established from SQL Server 2008 SSMS to Oracle.
What is the proper syntax for this simple query with a date expression in the where clause?
What is the proper date delimiter?
Is there a conversion necessary?
SELECT TOP (5) SURGERY_DATE
FROM OPENQUERY(CLARITY, 'SELECT * FROM OR_LOG WHERE SURGERY_DATE = ('8/1/2012')' AS a
Many thanks ahead of time.
Phunhog
Post #1347483
PaulB-TheOneAndOnly
PaulB-TheOneAndOnly
Posted Monday, August 20, 2012 3:47 PM
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Last Login: Yesterday @ 1:53 PM
Points: 2,984,
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Phunhog (8/20/2012)
Hello Oracle Forum:
I've got my first linked server established from SQL Server 2008 SSMS to Oracle.
What is the proper syntax for this simple query with a date expression in the where clause?
What is the proper date delimiter?
Is there a conversion necessary?
SELECT TOP (5) SURGERY_DATE
FROM OPENQUERY(CLARITY, 'SELECT * FROM OR_LOG WHERE SURGERY_DATE = ('8/1/2012')' AS a
First, there is no TOP clause on Oracle - if you want the first five rows returned you have to wrap-up the query like this...
select *
from
(
type-here-your-query-including-order-by-clause
)
where rownum < 6;
Second, assuming SURGERY_DATE is of the DATE data type syntax should go like...
... where SURGERY_DATE = TO_DATE('08/01/2012', 'mm/dd/yyyy')
This is assuming 08 represents the month and 01 represents the day on the month.
_____________________________________
Pablo (Paul) Berzukov
Author of
Understanding Database Administration
available at Amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
Post #1347497
Phunhog
Phunhog
Posted Tuesday, August 21, 2012 6:54 AM
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Last Login: Tuesday, January 29, 2013 12:34 PM
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Many thanks Mr. Berzuko:
Your expression works quite well!
My complete pass thru query looks like this:
SELECT LOG_ID, LOG_NAME, SURGERY_DATE
FROM OPENQUERY(CLARITY, 'SELECT * FROM OR_LOG WHERE SURGERY_DATE = TO_DATE(''08/01/2012'', ''mm/dd/yyyy'')') AS a
Note the addition of the doubled up single quotation marks for delimiters. (Whats the correct term for this?)
The inner derived table is a text string delimited by single quotes. AND the date expression(s) are ALSO delimited by single quotes. So the final concatenated string has doubled up single quotation marks.
THANKS for the help!
I may have more pass thru query questions.
Phunhog
Post #1347757
Jo Pattyn
Jo Pattyn
Posted Tuesday, August 21, 2012 12:05 PM
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Last Login: Today @ 4:47 AM
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Hint: rewrite select * to the actual field names.
Post #1348006
PaulB-TheOneAndOnly
PaulB-TheOneAndOnly
Posted Tuesday, August 21, 2012 4:35 PM
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Group: General Forum Members
Last Login: Yesterday @ 1:53 PM
Points: 2,984,
Visits: 4,403
Phunhog (8/21/2012)
Many thanks Mr. Berzuko:
Your expression works quite well!
/ / /
Note the addition of the doubled up single quotation marks for delimiters. (Whats the correct term for this?)
Glad it worked fine Phunhog. "Delimiter(s)" is fine.
_____________________________________
Pablo (Paul) Berzukov
Author of
Understanding Database Administration
available at Amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
Post #1348131
Phunhog
Phunhog
Posted Monday, August 27, 2012 10:02 AM
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Group: General Forum Members
Last Login: Tuesday, January 29, 2013 12:34 PM
Points: 36,
Visits: 203
One last question for Pablo or the oracle forum regarding dates in this SQL
SELECT LOG_ID, LOG_NAME, SURGERY_DATE
FROM OPENQUERY(CLARITY, 'SELECT * FROM OR_LOG WHERE SURGERY_DATE = TO_DATE(''08/01/2012'', ''mm/dd/yyyy'')') AS a
What is the proper expression to select
yesterdays
records rather than august first?
Is it WHERE SURGERY_DATE = TO_DATE((CURRENT_DATE, ''mm/dd/yyyy'')-1)
many thanks ahead of time
Phunhog
Post #1350465
Jo Pattyn
Jo Pattyn
Posted Monday, August 27, 2012 12:32 PM
Ten Centuries
Group: General Forum Members
Last Login: Today @ 4:47 AM
Points: 1,330,
Visits: 4,307
SELECT LOG_ID, LOG_NAME, SURGERY_DATE
FROM OPENQUERY(CLARITY, 'SELECT * FROM OR_LOG WHERE SURGERY_DATE >= trunc(sysdate-1) and SURGERY_DATE <trunc(sysdate)')
Please do not use where trunc(surgery_date)=trunc(sysdate-1) unless you have a functional-index on SURGERY_DATE.
The query above will use a normal index on SURGERY_DATE if present, stats are up to date and the datadistribution is favourable.
Post #1350527
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