SQL Exercises: Display the year and subject of Dennis Gabor prize

SQL Basic Select Statement: Exercise-14 with Solution.

From the following table, write a SQL query to locate the Nobel Prize winner ‘Dennis Gabor'. Return year, subject.

Sample table: nobel_win

YEAR SUBJECT                   WINNER                                        COUNTRY                CATEGORY
---- ------------------------- --------------------------------------------- ------------------------- ------------
1970 Physics                   Hannes Alfven                                 Sweden                 Scientist
1970 Physics                   Louis Neel                                    France                 Scientist
1970 Chemistry                 Luis Federico Leloir                          France                 Scientist
1970 Physiology                Ulf von Euler                                 Sweden                 Scientist
1970 Physiology                Bernard Katz                                  Germany                Scientist
1970 Literature                Aleksandr Solzhenitsyn                        Russia                 Linguist
1970 Economics                 Paul Samuelson                                USA                    Economist
1970 Physiology                Julius Axelrod                                USA                    Scientist
1971 Physics                   Dennis Gabor                                  Hungary                Scientist
1971 Chemistry                 Gerhard Herzberg                              Germany                Scientist
1971 Peace                     Willy Brandt                                  Germany                Chancellor
1971 Literature                Pablo Neruda                                  Chile                  Linguist
1971 Economics                 Simon Kuznets                                 Russia                 Economist
1978 Peace                     Anwar al-Sadat                                Egypt                  President
1978 Peace                     Menachem Begin                                Israel                 Prime Minister
1987 Chemistry                 Donald J. Cram                                USA                    Scientist
1987 Chemistry                 Jean-Marie Lehn                               France                 Scientist
1987 Physiology                Susumu Tonegawa                               Japan                  Scientist
1994 Economics                 Reinhard Selten                               Germany                Economist
1994 Peace                     Yitzhak Rabin                                 Israel                 Prime Minister
1987 Physics                   Johannes Georg Bednorz                        Germany                Scientist
1987 Literature                Joseph Brodsky                                Russia                 Linguist
1987 Economics                 Robert Solow                                  USA                    Economist
1994 Literature                Kenzaburo Oe                                  Japan                  Linguist

Sample Solution:

-- This query selects the 'year' and 'subject' columns from the 'nobel_win' table.
SELECT year, subject
-- Specifies the table from which to retrieve the data (in this case, 'nobel_win').
FROM nobel_win
-- Filters the rows to only include those where the 'winner' column has the value 'Dennis Gabor'.
WHERE winner = 'Dennis Gabor';

Output of the Query:

year	subject
1971	Physics

Code Explanation:

The above query in SQL that retrieves data from a table called 'nobel_win'. The query selects the year and subject columns from the table and filters the results by only displaying rows where the winner column is equal to 'Dennis Gabor'. The query is asking the database to select the year and subject of the nobel prize win for the winner named 'Dennis Gabor'.

Relational Algebra Expression:

Relational Algebra Tree:

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