Glossary term
What is NULL?
In Apex Flow Academy, "NULL" means: A marker that means no value is stored. It is not zero and not an empty piece of text. It is taught in SQL: Ask Any Database Any Question. Related terms include Alias, Aggregate function, Clause and GROUP BY. Every Apex Flow Academy course lists the official sources it checked.
- 1 course teaches it
- plain-word definition
The facts
What is NULL?
A marker that means no value is stored. It is not zero and not an empty piece of text.
Where is NULL taught?
NULL is defined in SQL: Ask Any Database Any Question.
Which lessons cover NULL?
These lessons name it in their title or objectives:
- SQL: Ask Any Database Any Question, lesson 3.4: NULL: When a Value Is Missing
Which terms are related to NULL?
Next to NULL in the course glossaries: Alias, Aggregate function, Clause, GROUP BY, Query, HAVING, Foreign key and Join.
AliasAggregate functionClauseGROUP BYQueryHAVINGForeign keyJoin
The hard questions, answered straight
Bold questions people really ask. Each answer comes from the course data or a settled Academy fact.
Do I need experience before I learn NULL?
It depends on the course. Each course that teaches it lists its own prerequisites, and all are listed at beginner level:
- SQL: Ask Any Database Any Question: No coding or database experience is needed.