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A comment on Easy Steps to a Complete Understanding of SQL. Parent comment
1. Value is unknown
2. Value does not exist (for example, outer join results).
These have ery different implications. For example:
somestring || does_not_exist you would think would equal somestring, but with unknown we dont know.
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1. Value is unknown
2. Value does not exist (for example, outer join results).
These have ery different implications. For example:
somestring || does_not_exist you would think would equal somestring, but with unknown we dont know.