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What is the best way to remove all spaces from a string in SQL Server 2008?

LTRIM(RTRIM('  a b ')) would remove all spaces at the right and left of the string, but I also need to remove the space in the middle.

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You can use REPLACE() function to remove the spaces in the entire column or a string. Not only spaces, but you can also replace any character with another character. Here is the SQL query to remove all spaces from a string in SQL Server:

SELECT REPLACE(Column_Name, ' ', '')

I recommend checking out this SQL Tutorial to learn more about REPLACE() function.

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