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,null,e,f from table3.
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SELECT CONCAT("SQL ", "Tutorial ", "is ", "fun!") AS ConcatenatedString; Try it Yourself ». Definition and Usage. The CONCAT() function adds two or more expressions together. Note: Also look at the CONCAT_WS() function. Syntax.
So we have a search field on our website, and I save all of the search terms to a database table. I brought up the search term table today and noticed some weird searches...
SELECT maker, MAX(type) FROM product GROUP BY maker HAVING COUNT(DISTINCT type) = 1 AND COUNT(model) > 1.
CONCAT() returns NULL if any argument is NULL.
(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько
SELECT * FROM news WHERE id_news = 5. Но если злоумышленник передаст в качестве параметра id строку -1 OR 1=1 (например, так