Check not NULL in entityfieldquery propertyCondition
53314
Excluding empty(Null) fields when using EntityFieldQuery query condition
47887
NULL values in where clause
51536
Concatenate fields in SOQL queries in the WHERE clause (no Apex)
27332
JSON control if @currentfield is empty
148793
Checking Textbox Text for Null
133857
Comparing nullable DateTime?
31537
Checking for null before event dispatching... thread safe?
2283
How to use LINQ to select object with minimum or maximum property value
32425
'Contains()' workaround using Linq to Entities?
124471
Comparing nullable column values using "IS NULL" versus "= NULL"
27369
Restrict node list in entity reference field based on node field
133675
EntityFramework - contains query of composite key
89714
What is the difference between Nullable.HasValue or Nullable != null?
114718
Is there a DBMS that allows the "= NULL" syntax?
131439
Filter linq list on property value
6288
How do I check if an object has a specific property in JavaScript?
57818
Is it possible to handle exceptions within LINQ queries?