Kindly use the hospital relational schema provided below to solve these questions. 2. List Registration numbers of all patients in H02, ward W18 who have been diagnosed with "Flu" but for whom "Chest X-ray" test has not been ordered. a) First get a table with only one column RegistrationNumber, which lists all patients from W18 of H02 who have been diagnosed with flu. b) Second, get a table with only one column RegistrationNumber, which lists all patients from W18 of H02 who have had a test with Tname="Chest X-ray". c) Finally, take the set difference.
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
Kindly use the hospital relational schema provided below to solve these questions.
2. List Registration numbers of all patients in H02, ward W18 who have been diagnosed with
"Flu" but for whom "Chest X-ray" test has not been ordered.
a) First get a table with only one column RegistrationNumber, which lists all patients
from W18 of H02 who have been diagnosed with flu.
b) Second, get a table with only one column RegistrationNumber, which lists all patients
from W18 of H02 who have had a test with Tname="Chest X-ray".
c) Finally, take the set difference.
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