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DB ERM Notation and Relationship Quick Check
Before I complete the rest of my ERM can someone quickly check Im on the right path with the relationship and notation found at:
If im right it should read as follows:
- A Coach driver will only be in the COACH_DRIVER table once and MAY have an entry in COACH_BOOKING zero or many times
- Zero or Many COACH_BOOKING must have a COACH_DRIVER
Thanks in advance !
P.S. The software Im using doesnt allow for dotted lines hence the use of circle notation on Coach Driver
Download a copy of DBDesigner (free) and give it another shot.