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 works can somebody help me...
...NULL,NULL,NULL,NULL,NULL ,NULL,NULL,NULL,NULL,NULL,NULL,version(),NULL,NULL
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/index.php?id=null union all select 1,2,3,4,user(),6,database(),8,version(),10,11,12,1 3,14,15–. As you can see we selected values from the showing columns, what if we want to clean this up a bit, and put all of those selected values in one column? This is where concat() comes in
UNION ALL SELECT NULL, *, NULL, NULL FROM email. Я понимаю, что это делает и почему; хакеру необходимо создать запрос с таким же количеством столбцов, что и запрос, с которым он соединен, и сдвиг вокруг *, чтобы убедиться, что сообщения электронной почты отображаются.
Вывод имён колонок (MySQL >= 4.1 колонки NOT NULL).
Union [all]. Select. column3, column4. FROM. table2; To use the UNION operator, you write the dividual SELECT statements and join them by the keyword UNION.
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In SQL Null is both a value as well as a keyword. Let's look into NULL value first -. Null as a Value. In simple terms, NULL is simply a place holder for data that does not exist. When performing insert operations on tables, they will be times when some field values will not be available.