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.
As shown below, I need not null values to be at the start of all output fields.
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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...
Note: A NULL value is different from a zero value or a field that contains spaces.
E.g. null + null + 1 = 1 null + null + null = null. The problem is that the first expression yields null.
The Oracle IS NOT NULL condition is used to test for a NOT NULL value. You can use the Oracle IS
In general, R supports: NULL NA NaN Inf / -Inf NULL is an object and is returned when an expression or function results in an undefined value.
The NOT NULL constraint specifies that NULL is not an allowable value. For example, in the following statement