Do extra spaces affect disk space size?

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SQL Server database
Storage
I currently have over 147 columns in a SQL Server database (with the majority of them as VARCHAR). This data is imported from our agency and for extra fields, they all include spaces in the field instead of entering an empty string / NULL. I just ran a script that would covert all those columns to NULL but my table storage size remained the same. Don't the spaces take up a ton of disk space? Why didn't I get added space?

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  • ToddN2000

    Most database systems will compress large sections on blanks to save disk space. For example if you have a part master file with a 100 char description, you may never use the full 100. If it kept the full space with blanks you would run out of disk very fast. You can tell by the test you ran.

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