select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f
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..?
Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as
Note: A NULL value is different from a zero value or a field that contains spaces.
What is the difference between … and … and why does the latter not work?
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
The null character (also null terminator or null byte), abbreviated NUL or NULL, is a control character with the value zero. It is present in many character sets, including ISO/IEC 646 (or ASCII)...
Keeping Null Values Using Default Values with INSERT ...
Union select null, null, null, null, null, null -- test all nulls --*/ ). A. DECLARE @ColumnDynamicSQL nvarchar(MAX)
R language supports several null-able values and it is relatively important to understand how these