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...
select a,b,null,null from table1 union select null,null,c,d from table2 union select null,null,null,null,e,f
A field with a NULL value is a field with no value. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this
Null Byte and using %60 union base Sql Injection. 15:31.
For grouping, ClickHouse interprets NULL as a value, and NULL=NULL. Here's an example to show what
In this video, I have explained about the NULL and NOT NULL values to find in the columns.
Заметка про NULL. Всем привет! Долго думал, что бы написать полезного про Оракл, перепробовал кучу тем.
SELECT header, txt FROM news UNION ALL SELECT name, pass FROM members This will combine results from both news table and members table
Union select null, null, null, null, null, null -- test all nulls --*/ ). A. DECLARE @ColumnDynamicSQL nvarchar(MAX)
NULL is special in SQL. NULL indicates that the data is unknown, inapplicable or even does not exist. In other words, NULL represents that the data is missing in the database. For example, if an employee does not have any phone number, you can store it as an empty string.