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by fabian2k
1439 days ago
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Postgres uses 1 bit per NULL value, though the reality is more complex as everything is padded for alignment. So fewer than 8 nullable columns are free, and above that you pay probably 8 bytes at once (I'm not totally sure on the exact numbers here). So for Postgres it is generally true that storing NULLs is very cheap in most cases. |
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