Examples of using Nulls in English and their translations into Italian
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Programming
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Colloquial
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Official
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Medicine
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Ecclesiastic
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Computer
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Official/political
OCaml has an elegant solution to the problem of nulls, using a simple polymorphic variant type defined(in Pervasives) as.
For Firebird 1.0, that was the end of the story: NULLs would always come last in any sorted set, period.
Firebird allows these NULLs to stay, also backs them up,
Programming languages also support nulls, although they may be easier to use in some than in others.
testing the(in)equality of two things when NULLs may be involved.
After all, if the server assures you that a column can't contain NULLs, why would you think you know better, override the server's decision and check for NULLs anyway?
there is no way to return NULLs to the client- unless the client flips back the flag before entering the data retrieval stage.
on two points of the disc- the so-called"nulls".
All columns except the TABLE_QUALIFIER column contain NULLs.
All columns except the TABLE_OWNER column contain NULLs.
among other enhancements- reports NULLs correctly, even in NOT NULL columns.
Even if NULLs are absolutely forbidden in the target key(for instance if the target is a PK), the foreign key column may still contain NULLs, unless this is prevented by additional constraints.
invalid field values are converted as nulls and logged on which row it occurred.
All columns except the TABLE_TYPE column contain NULLs.
may still vary over time according to the absence or presence of NULLs in the column.
as I mentioned before even tiny errors can have a major effect on the position of the nulls(*3) none of that malarkey here….
see SET ANSI_NULLS(Transact-SQL).
that is the case with NULLS FIRST.
You can override this default placement by adding a NULLS FIRST or NULLS LAST directive to the ORDER BY clause.
Specifying NULLS FIRST on an ascending or NULLS LAST on a descending sort in Firebird 2 is of course rather pointless.