Use the following table to find the OUTPUT of the following SQL queries: Table Name: Patients MEDICAL_NO FIRST NAME SUR NAME DOB GENDER PHONE FAX BLOOD TYPE WEIGHT SMOKER PCR TEST 1001 Said Alalawi 12-Jun-2001 Male 98877445 22114454 A 68 NO Negative 1002 Othman Mualla 20-Apr-2000 Male B 78 YES Positive 1003 Sameera Bader 19-Oct-2005 Female 25541122 52 NO Positive 1004 Fahad Alhinai 24-Feb-2004 Male 91122544 AB 66 YES Negative 1005 Shamsa Alfahdi 15-Sep-2002 Female B 35 NO Negative SELECT SUM (weight) FROM patients WHERE pcr test= 'Positive'; Answer:
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.
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