Re: NULL or 0 for a "FLAG_COLUMN"

> You should also keep in mind that NULLs can never be indexed; which could
> lead to performance issues.

NULLs will not be indexed. But in the OP's case, the only two values would be 0 and 1. Would an index really help in this case? It depends on the data distribution. If we have an even distribution (50% 0's and 50% 1's), then an index would not help. If we assume a really skewed distribution (5% 0's and 95% 1's) then an index would only help when searching for the value with the lowest cardinality (0 in this example).

Cheers,
Brian

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Brian Peasland
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