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...
Using SELECT * FROM SOME_EXISTING_TABLE Error Based. This works if you know the table name you're after and error showing is enabled. It will return the amount of columns in the table, not the query.
Синтаксис: 0xHEX_ЧИСЛО (SM): SELECT CHAR(0x66) (S) SELECT 0x5045 (это не число, а
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...
...menu_id=1'+limit+0+UNION+SELECT+1,concat_ws(0x3a,user(),version
· Using SELECT COUNT(*) or SELECT COUNT(1) (which is what I prefer to use) will return the total of all records returned in the result set regardless of NULL values. · Using COUNT()will count the number of non-NULL items in the specified column...
The first to see what might of happened here, the ‘null’ name bit, is the following command
returns non null values in group */ SELECT COUNT(Col1) FROM ##TestData; Because of this, COUNT, DISTINCT, and NULLs have a
Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами. IS NULL вернёт истину, если операнд имеет значение NULL и ложь, если он им не является.