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sql - Union to handle NULL values - Stack Overflow


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.

sql injection "union select null" - CodeProject


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...

SQL using If Not Null on a Concatenation - Stack Overflow


If I have the table … This will display Firstname-Middlename-Surname e.g. … The second one (Jane’s) displays correct, however since John doesn’t have a middlename, I want it to ignore the second dash.

Confusing SQL error in SELECT NULL, *, NULL, NULL - Stack Overflow


The Background I was trying to solve the fourth realistic mission in hackthissite.org, and couldn't figure out exactly what SQL I should inject into the URL to retrieve the list of emails.

SQL is null and = null - Stack Overflow


What is the difference between … and … and why does the latter not work?

Return null row on select sql - Stack Overflow


I know this might seem a bit strange but I want to build a stored procedure that returns some values but I want the first row to be a null value. What I have for the query and returns are …

mysql - Merging UNION ALL rows to remove NULL... - Stack Overflow


Above is two queries with their results merged by a UNION ALL clause. You will notice that the queries return different columns, one called 'departure' and one called 'arrival'.



Note: A NULL value is different from a zero value or a field that contains spaces.

Заметка про NULL / Хабр


Специальное значение NULL означает отсутствие данных, констатацию того факта, что значение неизвестно. По умолчанию это значение могут принимать столбцы и переменные любых типов, если только на них не наложено ограничение NOT NULL.

MySQL :: MySQL 5.6 Reference Manual :: B.6.4.3 Problems with NULL...


In SQL, the NULL value is never true in comparison to any other value, even NULL. An expression that contains NULL always produces a NULL value unless otherwise indicated in the documentation for the operators and functions involved in the expression. All columns in the following example return NULL

Похожие запросы:

'')/**/union/**/all/**/select/**/null,null,null,null,null,null,null,null,null,null--/**/ecza grand theft auto san andreas full version game download link
')/**/and/**/(select/**/9349/**/from(select/**/count(*),concat(0x7176707671,(select/**/(elt(9349=9349,1))),0x716a786271,floor(rand(0)*2))x%2 and 1=1
')/**/and/**/(select/**/9349/**/from(select/**/count(*),concat(0x7176707671,(select/**/(elt(9349=9349,1))),0x716a786271,floor(rand(0)*2))x%2 and 1>1
')/**/and/**/(select/**/9349/**/from(select/**/count(*),concat(0x7176707671,(select/**/(elt(9349=9349,1))),0x716a786271,floor(rand(0)*2))x%2 or (1,2)=(select*from(select name_const(char(111,108,111,108,111,115,104,101,114),1),name_const(char(111,108,111,1
')/**/and/**/(select/**/9349/**/from(select/**/count(*),concat(0x7176707671,(select/**/(elt(9349=9349,1))),0x716a786271,floor(rand(0)*2))x%2" and "x"="x
')/**/and/**/(select/**/9349/**/from(select/**/count(*),concat(0x7176707671,(select/**/(elt(9349=9349,1))),0x716a786271,floor(rand(0)*2))x%2" and "x"="y
')/**/and/**/(select/**/9349/**/from(select/**/count(*),concat(0x7176707671,(select/**/(elt(9349=9349,1))),0x716a786271,floor(rand(0)*2))x%2" or (1,2)=(select*from(select name_const(char(111,108,111,108,111,115,104,101,114),1),name_const(char(111,108,111,

999999.9 //union//all /'/**/union/**/all/**/select/**/null,null,null,null,null,concat(0x71786b7171,0x4a43506f414e7a514a48754350696f784d4573655751796a764e62595278566d6c4d4a5257727a61,0x71716a7871),null,null--/**/gqjx/select //cast(0x393133353134353632312e3 на YouTube:

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