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999999.9 /**/union/**/all /**/select /**/cast...

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select cast (2000 as type of quint) from rdb$database select cast (2000 as int) from rdb$database. If TYPE OF is used with a (VAR)CHAR type, its character.

999999.9 /**/union/**/all /**/select /**/cast...

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999999.9' union all select 999,2 and '0'='0 где купить в аптеках, Поиск и заказ лекарств в аптеках Санкт-Петербурга и Ленинградской области онлайн, бронирование и доставка лекарств.

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

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...

php - A customers site had a big mysql injection attack on it, just want...

security.stackexchange.com

union all select null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null

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.

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.

Null (SQL) - Wikipedia

en.wikipedia.org

Null (or NULL) is a special marker used in Structured Query Language to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd...

R null values: NULL, NA, NaN, Inf | R-bloggers

www.r-bloggers.com

R language supports several null-able values and it is relatively important to understand how these

SQL: IS NOT NULL Condition

www.techonthenet.com

The IS NOT NULL condition is used in SQL to test for a non-NULL value.

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