Test for no selection without a definition query
30800
Getting all results from Selection made by Attribute or Location using ArcPy?
43308
What is the difference between select count(*) and select count(any_non_null_column)?
12021
What is an equivalent of EXCEPT(in PostgreSQL) in MySQL?
158541
Does SOQL query get consumed when querying from an empty set?
5374
How to check if a macro value is empty or will not create text with plain TeX conditionals?
80984
How do I check if an HTML element is empty using jQuery?
158391
Most efficient way to check for DBNull and then assign to a variable?
106065
How to check if a Constraint exists in Sql server?
79883
Test for presence of specific object or managed package?
141744
How to create an empty per object in selection?
85934
When should a Test Case be marked as "No Apply"?
109553
1.13 Detect if no mobs with a specific tag exist and execute commands
115231
Deep null checking, is there a better way?
102109
Want to find records with no associated records in Rails
104501
How do I enforce null checking?
93742
Show that the conditional statement is a tautology without using a truth table
75971
Is there a PL/SQL pragma similar to DETERMINISTIC, but for the scope of one single SQL SELECT?