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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 works can somebody help me...

SQL using If Not Null on a Concatenation - Stack Overflow

stackoverflow.com

As @Prdp noted, the answer is RDBMS-specific. What is specific is whether the server treats a zero-length string as being equivalent to NULL, which determines whether concatenating a NULL yields a NULL or not. Generally COALESCE is most concise for PostgreSQL-style empty string handling, and...

sql - How return a count(*) of 0 instead of NULL - Stack Overflow

stackoverflow.com

You can't select the values from the table when the row count is 0. Where would it get the values for the nonexistent rows? To do this, you'll have to have another table that defines your list of valid Project and Financial_Year values. You'll then select from this table, perform a left join on your existing table...

sql - COUNT(*) Includes Null Values? - Stack Overflow

stackoverflow.com

1 1 1 NULL NULL NULL 2 2 NULL 1 3 1. Then. SELECT COUNT(*), COUNT(Field1), COUNT(Field2), COUNT(DISTINCT Field3) FROM Table1. Output Is: COUNT(*) = 4; -- count all rows, even null/duplicates --.

oracle - What is the difference between select count(*) and select...

dba.stackexchange.com

If one or more null values are eliminated, then a completion condition is raised: warning- null value eliminated in set function. The same rules apply to SQL Server and Sybase too at least. Note: COUNT(1) is the same as COUNT(*) because 1 is a non-nullable expression.

SQL COUNT « Язык запросов SQL

sql-language.ru

Синтаксис функции COUNT: SELECT COUNT(expression) FROM table WHERE predicates; Функция COUNT принимает один из нескольких параметров

Шпаргалка по SQL инъекциям | DefconRU

defcon.ru

(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько

25 примеров команды SELECT в MySQL | ИТ Блог.

andreyex.ru

Если вы используете базу данных MySQL, это очень важно, чтобы вы работали комфортно с командной строкой MySQL. На этом уроке мы расскажем, как использовать команду SELECT в MySQL с несколькими...

COUNT(*) / Хабр

habr.com

SELECT COUNT(*) FROM Sales.SalesOrderDetail SELECT COUNT_BIG(*) FROM

SQL SELECT DISTINCT Statement

www.w3schools.com

SELECT DISTINCT Examples. The following SQL statement selects only the DISTINCT values from the "Country" column in the "Customers" table

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