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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.
Selecting constants without referring to a table is perfectly legal in an SQL statement: SELECT 1, 2, 3. The result set that the latter returns is a single row containing the values.
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...
Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables.
...SELECT NULL,NULL,NULL,version(),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL
/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 or UNION ALL consists of many queries(branches) that in pre 12C releases were executed one by one.
Обзор последней версии Null’s Clash (10.134). Основная деревня на сервере Null’s Clash ничем не отличается от других серверов.