When checking for missing row, should use 'IS NULL' or '= NULL'
15097
Is there any difference between IS NULL and =NULL
114378
How to check if the string is empty?
126231
How can I manage the onslaught of null checks?
156262
One step check for null value & emptiness of a string
5640
How to check a string against null in java?
102608
WITH ROLLUP WHERE x IS NULL
89714
What is the difference between Nullable.HasValue or Nullable != null?
103752
What is the difference between != NULL and IS NOT NULL in QGIS filter expressions?
62074
Which is more effective: if (null == variable) or if (variable == null)?
79162
Javascript null or empty string does not work
145029
Return a "NULL" object if search result not found
157835
SQL Data Reader - handling Null column values
94883
Why does comparing a SQL date variable to null behave in this way?
89055
Possible to use ?? (the coalesce operator) with DBNull?
156714
How do I handle nonexistent or missing data?
93804
How to check for a Null value in VB.NET
104501
How do I enforce null checking?