NULL vs Default Value in SQL Server Database
127800
SQL: Using NULL values vs. default values
104243
Using ISNULL vs using COALESCE for checking a specific condition?
41898
Nullable integer in .NET
62914
Insert null/empty value in sql datetime column by default
32059
What is \null and when do we need to use it?
77986
Handle DBNull in C#
140374
Add a column with a default value to an existing table in SQL Server
120071
Checking for a null int value from a Java ResultSet
103775
DateTime "null" value
117500
default(T) with empty collection instead of null
143342
SQL function as default parameter value?
56652
Cannot add a NOT NULL column with default value NULL in Sqlite3
28648
Will new return NULL in any case?
148619
Is there a reason not to use  (null safe equals operator) in mysql instead of =?
93041
using nulls in a mysqli prepared statement
55830
What's the rationale for null terminated strings?
10184
Altering a column: null to not null