ER means that Entity relationship diagram that shows about system interaction on water and sewerage system development.Which is used fast and suficent water bill distribution for customers .
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er diagram for rto management system
try www.wikipedia.com which will help you for making ER - Diagram ....and copy past given link below in your browser for detailed description about ER - Diagram :http://www.infocom.cqu.edu.au/Courses/spr2000/95169/Extra_Examples/ERD.htm
DFD diagram of company payroll system.
E-R diagram for park management
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