One of them is appropriate in any given situation, and the other does not carry the needed information. I assume that a doctor can order more than one test for a given patient. What is the third entity you need to specify in order to pin down a specific instance of a test. Q1: Why do you need a ternary relationship? Test is a relationship between a patient and a doctor. Q6- Any good source to learn EER ,advanced topics of database designing(relational algebra,etc.) and about ternary relationships(I have searched youtube and google but none of them was satisfactory)?
PENNLITE TERNARY DIAGRAM ANSWERS HOW TO
Q5- How to conclude which entity should be made weak and whichshould be not? Q4- If we have concept of surrogate key then why does weak entity exists in first place?
Q3- Can a relationship can have it's own prime(key) attribute? Q2- What is the difference between 3 binary relationship and 1 ternary relationship(and also which of them carrys more information)? Q1- But I am confused how to achive this using ternary relation? A patient and his report can have tests from N no of doctors.A doctor makes a report for specific patient.A patient and a doctor maintains only one report.The ternary relationship test should signify that: I want tests to be stored in hospital database as well as in the patient's report file(all the tests of a specific patient should be stored in his/her report file). I am trying to make a very basic ER diagram for hospital and there are few questions and doubts in my mind. 229910052718 tin Inorganic materials 0.I have newly learned about ER diagrams and how powerful they are.239000011135 tin Substances 0.000 title claims abstract description 94.229910000679 solders Inorganic materials 0.000 title claims abstract description 113.
filed Critical Sarkhel Amit Kumar Priority to US09/771,240 priority patent/US20010002982A1/en Publication of US20010002982A1 publication Critical patent/US20010002982A1/en Status Abandoned legal-status Critical Current Links
Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US1959196P priority Critical Priority to US76887896A priority Priority to US21604298A priority Application filed by Sarkhel Amit Kumar, Woychik Charles G. Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Abandoned Application number US09/771,240 Inventor Amit Sarkhel Charles Woychik Original Assignee Sarkhel Amit Kumar Woychik Charles G.
PENNLITE TERNARY DIAGRAM ANSWERS PDF
Google Patents Lead-free, high tin ternary solder alloy of tin, silver, and bismuthĭownload PDF Info Publication number US20010002982A1 US20010002982A1 US09/771,240 US77124001A US2001002982A1 US 20010002982 A1 US20010002982 A1 US 20010002982A1 US 77124001 A US77124001 A US 77124001A US 2001002982 A1 US2001002982 A1 US 2001002982A1 Authority US United States Prior art keywords tin silver solder bismuth essentially Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US20010002982A1 - Lead-free, high tin ternary solder alloy of tin, silver, and bismuth US20010002982A1 - Lead-free, high tin ternary solder alloy of tin, silver, and bismuth
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