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.
Then in the second table I have select ..., null as opt from... I know that I could have an empty string with '' as
Select null, 'Actual null' from dual union all select '', 'Null string' from dual union all select ' ', 'single
The Background I was trying to solve the fourth realistic mission in hackthissite.org, and couldn't figure out exactly what SQL I should inject into the URL to retrieve the list of emails.
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..?
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...
Note: A NULL value is different from a zero value or a field that contains spaces.
I've found some good advice all over this board, but here's another, simpler, question I'm sure anyone can answer. I'm using borland 5 and i can't seem to set my char arrays to the null character. I've tried char name[10]=/0; char name[10]...
Is there a way to set a char variable to 0 or null or something so that it will basically reset my control variable.