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Get Row Count of Insert/Update/Delete records in MERGE Statement – MSDN TSQL forum

March 29, 2017 Leave a comment

 
–> Question:

How can I get the numbers of records affected in the Merge statement, INSERT,UPDATE,DELETE separately and store it in a variable so I can get it in the application side?

Thanks !
 

–> My Answer:

You need to use OUTPUT clause with MERGE statement, try this:

DECLARE @SummaryOfChanges TABLE(Change VARCHAR(20));

MERGE tblTarget AS Target
USING (SELECT Col1,Col2 FROM tblSource) AS Source
ON (Target.Col1 = Source.Col1)

WHEN MATCHED THEN 
	UPDATE SET target.Col2 = source.Col2 -- Need to get affected rows here

WHEN NOT MATCHED BY TARGET THEN
	INSERT (Col1,Col2) VALUES (Col1,Col2); -- Need to get affected rows here

OUTPUT $action INTO @SummaryOfChanges; --< check here

-- Get the count of Insert/Update/Delete'd records from the below table variable
SELECT Change, COUNT(*) AS CountPerChange
FROM @SummaryOfChanges
GROUP BY Change;

For more info on MERGE and OUTPUT clause statement check this link: http://technet.microsoft.com/en-us/library/bb510625.aspx


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Categories: SQL Tips Tags: ,

New built-in function CONCAT_WS() in SQL Server 2017

January 20, 2017 1 comment

 
In my previous posts I discussed new Functions introduced in SQL Server vNext (or 2018), like STRING_AGG(), TRIM(), TRANSLATE().
 

Here in this post I’ll discuss about one more new function i.e. CONCAT_WS(), here “_WS” means “With Separator”.

This is very similar to the existing CONCAT() function introduced back in SQL Server 2012, which concatenates a variable number of arguments or string values.

The difference is the new function CONCAT_WS() accepts a delimiter specified as the 1st argument, and thus there is no need to repeat the delimiter after very String value like in CONCAT() function.

Also the new CONCAT_WS() function takes care of NULL values and do not repeat the delimiter, which you can see in 2nd example below.
 

Syntax:

CONCAT_WS ( separator, argument1, argument1 [, argumentN]… )

 

–> Example #1:

With CONCAT_WS() we will use the delimiter just once and it concatenates the names separated by ‘-‘, and do not repeat the hyphen where the middle name is NULL.

USE [AdventureWorks2014]
GO

SELECT TOP 10 
	CONCAT_WS(' - ', FirstName, MiddleName, LastName) as FullName, 
	FirstName, MiddleName, LastName
FROM [Person].[Person]

concat_ws-01
 

–> Example #2:

With CONCAT() the delimiter needs to be used after every argument, it concatenates the names separated by ‘-‘, do repeats the hyphen where the middle name is NULL.

SELECT TOP 10 
	CONCAT(FirstName, ' - ', MiddleName, ' - ', LastName) as FullName, 
	FirstName, MiddleName, LastName
FROM [Person].[Person]

concat_ws-02


New built-in function TRANSLATE() in SQL Server 2017

December 29, 2016 2 comments

 
Microsoft looks very serious this time to move people from other databases to SQL Server. As with SQL Server 2016 & 2017 you can see lot of Built-in function added, which were present in other databases from long back, will ease database development in SQL Server.

One of this function is TRANSLATE() function, which can be used like a REPLACE() function, and would avoid using REPLACE() function multiple times in a query.
 

Syntax:

TRANSLATE ( inputString, characters, translations)

Note: characters and translations params should have same length.
 

–> Consider this example I’ve taken from MSDN:

SELECT TRANSLATE('2*[3+4]/{7-2}', '[]{}', '()()');
GO

Output:

Input Output
2*[3+4]/{7-2} 2*(3+4)/(7-2)

 

–> If you had to do same with REPLACE() function then you would end up writing multiple & nested REPLACE() function, like:

SELECT 
	REPLACE(
		REPLACE(
			REPLACE(
				REPLACE('2*[3+4]/{7-2}', '[', '('), 
			']', ')'), 
		'{', '('), 
	'}', ')');
GO

 

After working with this new feature it reminds me of IIF vs CASE statement. The IIF() function also works as a shortcut of CASE statement and cuts lot of clutter and gives you clean code.

Hope you find this small utility very handy while developing complex queries, will post more scenarios if I came across going forward, thanks !!!


New built-in function TRIM() in SQL Server 2017

December 26, 2016 1 comment

 
If you are thinking the new TRIM() function in SQL Server 2017 is just a combination of LTRIM() & RTRIM() functions, then you are wrong :). It’s more than that and we will check it today !
 

– LTRIM() function is used to truncate all leading blanks, or white-spaces from the left side of the string.

– RTRIM() function is used to truncate all trailing blanks, or white-spaces from the right side of the string.
 

–> Now, with teh new TRIM() function you can do both, but more than that.

Usage #1: TRIM() function will truncate all leading & trailing blanks from a String:

SELECT 
	TRIM ('  Manoj Pandey     ') as col1,
	LTRIM(RTRIM('  Manoj Pandey     ')) as col2

trim-1

Usage #2: Plus it can be used to remove specific characters from both sides of a String, like below:

SELECT 
	TRIM ( 'm,y' FROM 'Manoj Pandey') as col1,
	TRIM ( 'ma,ey' FROM 'Manoj Pandey') as col2,
	TRIM ( 'm,a,e,y' FROM 'Manoj Pandey') as col3

trim-2

Thus with the above query you can see that you can trim characters too, by providing leading & trailing characters, but should be in same sequence as your string is.

Also for Col2 & Col3 we have provided Trimming Characters in 2 different ways, but got the same output.
 

–> Note: I just mentioned above that the leading & trailing characters should be in same sequence. If you provide in different sequence like below you won’t get desired results.

SELECT 'Manoj Pandey' as st,
	TRIM ( 'a,n' FROM 'Manoj Pandey') as Col1,
	TRIM ( 'm,e' FROM 'Manoj Pandey') as Col2,
	TRIM ( 'm,o,y,e' FROM 'Manoj Pandey') as Col3

trim-3

Like for Col3 you cannot get rid of middle characters (like ‘o’ and ‘n’) until and unless they become leading or trailing characters.


SQL Error – SQL Server blocked access to STATEMENT ‘OpenRowset/ OpenDatasource’ of component ‘Ad Hoc Distributed Queries’

December 25, 2016 Leave a comment

 
Today while executing a Stored Procedure which internally executes a remote query via Linked Server, I got following error:

Msg 50000, Level 16, State 127, Procedure spExecureRemoteQuery, Line 50

SQL Server blocked access to STATEMENT ‘OpenRowset/OpenDatasource’ of component ‘Ad Hoc Distributed Queries’ because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of ‘Ad Hoc Distributed Queries’ by using sp_configure. For more information about enabling ‘Ad Hoc Distributed Queries’, search for ‘Ad Hoc Distributed Queries’ in SQL Server Books Online.

 

The above clearly means that the “Ad Hoc Distributed Queries” option is disabled on the database instance.

–> Run below Query to check if this property is disabled, if will show you 0 value under Config & Run value columns:

sp_configure 'show advanced options', 1
GO
EXEC sp_configure
GO

adhocdistributedqueries
 

–> To enable it run the below Query:

sp_configure 'Ad Hoc Distributed Queries', 1
GO
RECONFIGURE WITH OverRide
GO
EXEC sp_configure
GO

adhocdistributedqueries-set

…the value under Config & Run value columns shows 1, means that now the Property is enabled and you can execute your Remote/Linked-Server queries.