Optional participation means that one entity occurrence does not require a corresponding entity occurrence in a particular relationship.
{"Image DocumentName": "Optional participation means that one entity occurrence does not require a corresponding entity occurrence in a particular relationship.", "Image ImageDescription": "For example, in the COURSE generates CLASS relationship, you noted that at least some courses do not generate a class. In other words, an entity occurrence (row) in the COURSE table does not necessarily require the existence of a corresponding entity occurrence in the CLASS table. (Remember that each entity is implemented as a table.) Therefore, the CLASS entity is considered to be optional to the COURSE entity. In Crow\u2019s Foot notation, an optional relationship between entities is shown by drawing a small circle (O) on the side of the optional entity. The existence of an optional entity indicates that the minimum cardinality is 0 for the optional entity. (The term optionality is used to label any condition in which one or more optional relationships exist.)", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}