Storing Variable-Length Decimal Data

If you have lots (and I mean LOTS — we have 175 GB of school-related data, and our biggest per-table savings would have been 1.5 MB) of nulls in decimal/numeric columns with large precision, you may be able to save noticeable space with vardecimal, which requires only 2-4 bytes per column when the column is 0 or null.

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