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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Using SQL answer the following or how would I answer something similar. Create a temporary table T for diagnoses_icd, such that only the first three characters of the diagnosis code are preserved. Subsequently, count the number of unique diagnoses in T count the number of unique diagnoses for each animal patient in T Repeat 1 entirely, except the first three digits in every diagnosis should be preserved (in addition to any letters) and saved in a temporary table T1. E.g., for code ‘S4001’ preserve ‘S400’; for ‘0456’ preserve ‘045’. Use T1 created in 2. Count animal patients diagnosed for each ICD code* and list the top 10 most common diagnoses. *Do not count a animal patient more than once for each ICD

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