CASE Statement Returning NULL instead of Empty String (Oracle 19c)
2097
Why does Oracle 9i treat an empty string as NULL?
22361
String concatenation with Null
6669
What is the string concatenation operator in Oracle?
28868
Null resultsets when calling Sybase stored procedure through JDBC
120428
Entering null characters in a string
97235
Test if any columns are NULL
123126
Why does query error with empty result set in SQL Server 2012?
89055
Possible to use ?? (the coalesce operator) with DBNull?
124471
Comparing nullable column values using "IS NULL" versus "= NULL"
53314
Excluding empty(Null) fields when using EntityFieldQuery query condition
98632
Using CASE Statement inside IN Clause
151469
What is the difference between null and System.DBNull.Value?
6235
Is SQL syntax case sensitive?
35129
Why does String.valueOf(null) throw a NullPointerException?
114718
Is there a DBMS that allows the "= NULL" syntax?
5975
How to avoid returning a Null if there is no "else" condition in an If construct
126341
Avoiding IF ELSE due to variable been NULL