...UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x717a6a7171
1 UNION ALL SELECT NULL,CONCAT(0x7166787171,0x5a64434c43587a584d47,0x7179677771),NULL,NULL,NULL,NULL#.
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Home Search 999999.9` uNiOnaLl sElEcT null,null,null and `0`=`0.
PLAY161 » 2 results for: 999999 9 30000UNION all select null null null null null null select concat 0X7E 0X27 0X723.
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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...
0x31303235343830303536 is NULL - they are just matching the number of columns in your existing query. If you had SELECT * FROM users and users had 4 columns, the UNION must also have 4 columns. As a result, they just used `NULL values to populate those columns.
-999.9+union+all+select+%27R3DM0V3_hvj_injection',null%2CNULL%2CNULL%2CNULL%2CNULL%2CNULL%2CNULL%2CNULL
NULL в Системах управления базами данных (СУБД) — специальное значение (псевдозначение), которое может быть записано в поле таблицы базы данных (БД). NULL соответствует понятию «пустое поле», то есть «поле, не содержащее никакого значения».