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How to write the SQL sentence

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How to write the SQL sentence MS SQL Development forum discussing administration, MS SQL queries, and other MS SQL-related topics. SQL Server is Microsoft's enterprise database engine.

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  #1  
Old October 21st, 2003, 09:12 PM
Rong Gu Rong Gu is offline
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Question How to write the SQL sentence
If I want to change the value of a special bit in a column, how to wirte the SQL sentence in sqlserver.
I mean in a column, the value is 'test', then how to change the 's' to 'e' or any other value by just one SQL sentence.
Thanks.
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Old October 22nd, 2003, 12:17 AM
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UPDATE tablename SET column_name = 'teet' WHERE column_name = 'test'
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Old October 22nd, 2003, 12:48 AM
Rong Gu Rong Gu is offline
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Thank you,but you hadn't unserstood my meaning.
I mean, suppose there is a column with the property nvarchar(100), I don't know the original value,but I want to change the value on the 23th position to another value such as 'p'.

My problem is: with 'SUBSTRING', I can get a value, but how can I change the value? The MS SQL seems not to support this method.
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Old September 2nd, 2004, 04:11 AM
sjosse sjosse is offline
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select "TEST" as original,SUBSTRING("TEST",1,2) + 'E' + RIGHT("TEST",DATALENGTH("TEST")-3) as changed

in the first substring the lenght parameter is equal to pos to be changed minus 1
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