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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.
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 don't want an empty string, I really do need it to be null.
Number of null-s on change between passed and failed queries is the one attacker looks for.
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
SELECT CAST (miles AS INT) FROM Flights -- convert timestamps to text INSERT INTO mytable (text_column) VALUES (CAST (CURRENT_TIMESTAMP AS VARCHAR(100))) -- you must cast NULL as a data type to use it SELECT airline FROM Airlines UNION ALL...
The null character (also null terminator or null byte), abbreviated NUL or NULL, is a control character with the value zero.
Union select null, null, null, null, null, null -- test all nulls --*/ ). A.
NULL handling in the Oracle database is even more special.