What does o2m, m2o, m2m stands for?

While reading documentation or code comments, one may meet terms o2m, m2o, m2m. What do they stand for?

Also what do they mean?

2 Answers

They are abbreviations of cardinalities used in data modeling for:

• one to many
• many to one
• many to many

So obviously one may also encounter o2o for one to one relations.

You could also have O2O:

• One-to-One (O2O)
• One-to-Many (O2M)
• Many-to-One (M2O)
• Many-to-Many (M2M)

List of Technology Acronyms