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...
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null
Yes! I found the error! It's right after the word "find" and before "1".
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Не сейчас. Месяц бесплатно. SGs2 imei (null null) решение проблемы. Лунный Енот. Загрузка...
Плохо получается, если всю семью на своих плечах тянет один человек. Особенно всё ужасно, если этим...
Arithmetic operations involving NULL always return NULL for example, 69 + NULL = NULL. All aggregate functions affect only rows that do
It provide C programs like Looping, Recursion, Arrays, Strings, Functions, File Handling and some advance data structures.
LEFT JOIN / IS NULL is less efficient, since it makes no attempt to skip the already matched values in the right table, returning all results and filtering them out
SELECT * FROM ( SELECT 1 AS a FROM DUAL UNION ALL SELECT 2 AS a FROM DUAL UNION ALL SELECT 3 AS a FROM DUAL ) t. Now that you’re seeing that VALUES() and derived tables are really the same thing, conceptually, let’s review the INSERT statement, which comes in two flavors