UNION ALL SELECT NULL, *, NULL, NULL FROM email. I understand what this does and why; the hacker needs to create a query that has the same number
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...
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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.
Does the mysql UNION and UNION ALL operator always remove rows that have a NULL in them? I am doing a UNION of two SELECT statements - one of which may return a row with a NULL in it. When it does, it does not include that row in the UNION. Is there a way around this?
...1+union+select+null,2,concat(memberName,char(58),passwd,char(58),PasswordSalt),4,5+from+smf_members/* A-ONE.
SELECT col1 AS col FROM yourtable UNION SELECT col2 AS col FROM yourtable UNION -- ... UNION SELECT coln AS col FROM yourtable ) T1 WHERE col IS NOT NULL. And I agre with Martin that if you need to do this then you should probably change your database design.
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11223344) UNION SELECT 1,2,NULL,NULL WHERE 1=2 – Если появилась ошибка, значит второй стоблец не является числом.