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.
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...
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
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.
A NULL column is not countable, however a row that has a NULL column is.
The null character (also null terminator or null byte), abbreviated NUL or NULL, is a control character with the value zero.
You can use the Oracle IS NOT NULL condition in either a SQL statement or in a block of PLSQL code.
Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left
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?