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Refactor SQL queries to select distinct values #99

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Refactor SQL queries to select distinct values #99

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6 changes: 3 additions & 3 deletions SQL Deep Dive/Distinct/questions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
* Question: What unique titles do we have?
*/

SELECT * FROM titles;
SELECT DISTINCT(title) FROM titles;


/*
Expand All @@ -13,7 +13,7 @@ SELECT * FROM titles;
* Question: How many unique birth dates are there?
*/

SELECT * FROM employees;
SELECT DISTINCT(birth_date) FROM employees;

/*
* DB: World
Expand All @@ -22,5 +22,5 @@ SELECT * FROM employees;
* Make sure there are no nulls
*/

SELECT * FROM country;
SELECT DISTINCT lifeexpectancy FROM country WHERE lifeexpectancy IS NOT NULL ORDER BY lifeexpectancy;