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A comment on Three-Valued Logic. Parent comment

Re:Three-Valued Logic by nalllar on Friday December 15, 2017 @06:41AM (#15931134)
You can use `A IS NOT DISTINCT FROM B` to compare if you want to treat NULLs as equal instead of unknown.

Unfortunately it is poorly supported.

See http://modern-sql.com/feature/is-distinct-from

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