Struture Query Languages

Q . Explain the ERD and give instances of sidesteps and how they are relatedERD stands for Entity Relationship Diagram . It is a diagram which is used to express the structure of the database logically . a lot , making Entity Relation Diagram is the first step when calculative a software application or a final applicationEntities , attributes and dealinghips are wagered in entity kinship diagram by and through different shapesRectangles , encounter entity setsEllipses , represent attributesDiamonds , represent kin setsLines , represent linking attributes to entity sets and entity sets to relationship setsThis is basic entity relationship diagram . For exercising in this diagram the two attributes on the top left recognise to a unmarried entity (which is represented in rectangle .

Entities use up relations between each other There seat be different type of relationships integrity to many relationship (for fashion model , a teacher is related to many studentsone to one relationship ( for typesetters case , one person can only have one Facebook accountmany to many relationship ( for example , many throng can talk to many salesman in a obtain mallQ . light upon entities , attributes , primary keys , foreign keys , and defining relationships , highlighting their differences . send about examplesEntity is a single person , place , or involvement about which data can be stored . For example , a student has student number , st udent throw appeal , phone number , and so! on . all(prenominal) of these flesh out to meether is placed in the single entity or table called student . The entities may have relationship between the entities . For example , student entity may have...If you want to get a all-embracing essay, order it on our website: OrderCustomPaper.com

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