aLl sElEcT null null null null.
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f from table3.
999999.9 union all select 0x31303235343830303536-- на YouTube: Поиск реализован с помощью YandexXML и Google Custom Search API.
Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as opt however, I don't want an empty string, I really do need it to be null.
SELECT SAFE.SUBSTR('foo', 0, -2) AS safe_output UNION ALL SELECT SAFE.SUBSTR('bar', 0
that's wrong though. (char*)NULL isn't a string at all, it's a null pointer. this isn't a string either even though it's an array of char.
R language supports several null-able values and it is relatively important to understand how these values
CAST(expression AS datatype(length)). Parameter Values.
Nowe try this: SELECT CAST (NULL AS varchar(25)) AS Column1 INTO dbo.Frank1. EXEC sp_help 'dbo.Frank1'
NULL represents an unknown value. It is not an empty string (by default), or a zero value. These are all valid values, and are not NULLs. When a table is created or the format altered, columns can be specified as accepting NULL values, or not accepting them, with the NULL and NOT NULL clauses...