t-sql   537

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How to drop a table if it exists in SQL Server? - Stack Overflow
IF OBJECT_ID('tempdb.dbo.#T', 'U') IS NOT NULL
5 weeks ago by ienhienly
SQL SERVER - Synchronize Data Exclusively with T-SQL - SQL Authority with Pinal Dave
Database developers often face the task to synchronize users' data. Currently, to solve this task, there was developed quite a big number of various utilities. In this article, we will review the process of creating the new functionality to synchronize data exclusively with T-SQL.
sql_server  data  synchronization  t-sql 
july 2018 by ritzlea
What is the Size of the LOB Pointer for (MAX) Types Like Varchar, Varbinary, Etc? | Mark S. Rasmussen
What is the Size of the LOB Pointer for (MAX) Types Like Varchar, Varbinary, Etc?
june 2018 by ienhienly
sql - How do I split a string so I can access item x? - Stack Overflow
This question is not about a string split approach, but about how to get the nth element.

All answers here are doing some kind of string splitting using recursion, CTEs, multiple CHARINDEX, REVERSE and PATINDEX, inventing functions, call for CLR methods, number tables, CROSS APPLYs ... Most answers cover many lines of code.

But - if you really want nothing more than an approach to get the nth element - this can be done as real one-liner, no UDF, not even a sub-select... And as an extra benefit: type safe

Get part 2 delimited by a space:

DECLARE @input NVARCHAR(100)=N'part1 part2 part3';
SELECT CAST(N'<x>' + REPLACE(@input,N' ',N'</x><x>') + N'</x>' AS XML).value('/x[2]','nvarchar(max)')

Of course you can use variables for delimiter and position (use sql:column to retrieve the position directly from a query's value):

DECLARE @dlmt NVARCHAR(10)=N' ';
DECLARE @pos INT = 2;
SELECT CAST(N'<x>' + REPLACE(@input,@dlmt,N'</x><x>') + N'</x>' AS XML).value('/x[sql:variable("@pos")][1]','nvarchar(max)')

If your string might include forbidden characters (especially one among &><), you still can do it this way. Just use FOR XML PATH on your string first to replace all forbidden characters with the fitting escape sequence implicitly.

It's a very special case if - additionally - your delimiter is the semicolon. In this case I replace the delimiter first to '#DLMT#', and replace this to the XML tags finally:

SET @input=N'Some <, > and &;Other äöü@€;One more';
SET @dlmt=N';';
SELECT CAST(N'<x>' + REPLACE((SELECT REPLACE(@input,@dlmt,'#DLMT#') AS [*] FOR XML PATH('')),N'#DLMT#',N'</x><x>') + N'</x>' AS XML).value('/x[sql:variable("@pos")][1]','nvarchar(max)');

shareimprove this answer
edited Mar 6 at 14:25
answered Jul 8 '16 at 20:41

This should be the correct answer! – Brendan Gooden Feb 28 '17 at 23:30
may 2018 by ienhienly
sql server - Show empty string when date field is 1/1/1900 - Stack Overflow
When you want a date to show as '' instead of NULL. A CASE WHEN ELSE '' statement doesn't behave as expected.
t-sql  howto 
may 2018 by ostertoaster

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