SQL: Display the winners in Physics for 1970 together with the winner of Economics for 1971
SQL Basic Select Statement: Exercise-19 with Solution.
From the following table, write a SQL query that combines the winners in Physics, 1970 and in Economics, 1971. Return year, subject, winner, country, and category.
Sample table: nobel_win
Sample Solution:
SELECT * FROM nobel_win WHERE (subject ='Physics' AND year=1970) UNION (SELECT * FROM nobel_win WHERE (subject ='Economics' AND year=1971));
Output of the Query:
year subject winner country category 1970 Physics Hannes Alfven Sweden Scientist 1970 Physics Louis Neel France Scientist 1971 Economics Simon Kuznets Russia Economist
Relational Algebra Expression:
Relational Algebra Tree:
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Previous: From the following table, write a SQL query to find the details of the winners whose first name matches with the string 'Louis'. Return year, subject, winner, country, and category.
Next: From the following table, write a SQL query to find the Nobel Prize winners in 1970 excluding the subjects Physiology and Economics. Return year, subject, winner, country, and category.
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SQL: Tips of the Day
Can a foreign key be NULL and/or duplicate?
First remember a Foreign key simply requires that the value in that field must exist first in a different table (the parent table). That is all an Foreign key is by definition. Null by definition is not a value. Null means that we do not yet know what the value is.
Ref: https://bit.ly/3uVu3OS
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