﻿ SQL: Show all Nobel Prize winners from the year 1970, except for the subjects Physiology and Economics - w3resource

# SQL: Show all Nobel Prize winners from the year 1970, except for the subjects Physiology and Economics

## SQL Basic Select Statement: Exercise-20 with Solution.

From the following table, write a SQL query to find the Nobel Prize winners in 1970 excluding the subjects of Physiology and Economics. Return year, subject, winner, country, and category.

Sample table: nobel_win

Sample Solution:

``````SELECT *
FROM nobel_win
WHERE year=1970
AND subject NOT IN('Physiology','Economics');
``````

Output of the Query:

```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   Literature Aleksandr Solzhenitsyn Russia     Linguist```

Relational Algebra Expression:

Relational Algebra Tree:

## Query Visualization:

Duration:

Rows:

Cost:

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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