select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f
select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database.
Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as
Select char_length(cast('123456789 1' as varchar(10))) from rdb$database. Получаем: Exception ... string truncation Т.е. пробел мы обрезать можем, а другие символы нет.
How can I run a MySQL query that selects everything that is not null? It would be something like … Do I just remove the all and go..?
Note: not a NULL field value, but the null character (see link). I have a column with a mix of typical and a null character.
Select null, 'Actual null' from dual union all select '', 'Null string' from dual union all select ' ', 'single
Note: A NULL value is different from a zero value or a field that contains spaces.
gcc 4.4.4 c89 What is the standard way to null terminate a string? When I use the NULL I get a warning message. … Source code: … Another question: I deliberately commented out the line that null...
> char array[SIZE] = {0}; Nothing wrong with this. It just assumes that the remaining SIZE-1 elements are also zero, so that's it, job done.