Oracle Turns "" into NULL
2097
Why does Oracle 9i treat an empty string as NULL?
140738
Does setting Java objects to null do anything anymore?
115344
Using a literal string in SELECT statement
69530
Equivalent of (foo &>/dev/null &) in Windows shell
123797
Not equal  != operator on NULL
156262
One step check for null value & emptiness of a string
98908
Is it good practice to set variables to null when they are no longer needed?
33474
I can read from /dev/null; how to fix it?
19389
What does a (+) sign mean in an Oracle SQL WHERE clause?
65694
What is the difference between NULL, '\0' and 0?
21232
How do I reset a sequence in Oracle?
68713
Why is it Valid to Concatenate Null Strings but not to Call "null.ToString()"?
118970
How do I include nulls during comparisons in SQL Server?
127800
SQL: Using NULL values vs. default values
53797
mysqli prepared statements, insert NULL using bind params
92187
Unable to cast object of type 'System.DBNull' to type 'System.String`
32059
What is \null and when do we need to use it?