...9199'+union+select+ NULL,NULL,NULL,version(),NULL,NULL,NULL,NULL,NULL,NULL,NULL.
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f
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...
Швейная машинка Union полностью в рабочем состоянии.
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 VALUES (CAST...
Note: A NULL value is different from a zero value or a field that contains spaces.
E.g. null + null + 1 = 1 null + null + null = null. The problem is that the first expression yields null.
R language supports several null-able values and it is relatively important to understand how these values
NULL is special in SQL. NULL indicates that the data is unknown, inapplicable or even does not exist.