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 - Why aren't nulls counted in COUNT... - Stack Overflow
COUNT counts values, since null is not a value it does not get counted. If you want to count all null values you could do something like this
sql - WHERE all IS NOT NULL - Stack Overflow
SELECT * FROM `mydata`.`mytable` WHERE CONCAT(<list of columns>) IS NOT NULL. All we are missing now is the list of nullable columns, comma-separated. We're going to use the GROUP_CONCAT function to produce the final statement, which we will execute like this
Шпаргалка по SQL инъекциям | DefconRU
(M): SELECT CONCAT(login, password) FROM members. 7. Строки без кавычек Есть несколько
SQL COUNT(), AVG() and SUM() Functions
String Functions ASCII Char Charindex Concat Concat with + Concat_WS
CASE WHEN Problem with CASE NULL
Select Case When @test IS NULL THEN 'Value is Null' ELSE 'Value is not Null' END Test.
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.
SQL WHERE IS NULL | SELECT WHERE IS NOT NULL | NULL or...
SELECT column-names FROM table-name WHERE column-name IS NOT NULL.
Команда IS NOT NULL - проверка поля на не NULL | Трепачёв...
Пример: SELECT * FROM workers WHERE salary IS NOT NULL.