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Update questions(my answers).sql #78

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12 changes: 7 additions & 5 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 +4,8 @@
* Question: What unique titles do we have?
*/

SELECT * FROM titles;
SELECT DISTINCT title
FROM titles


/*
Expand All @@ -13,14 +14,15 @@ SELECT * FROM titles;
* Question: How many unique birth dates are there?
*/

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

/*
* DB: World
* Table: country
* Question: Can I get a list of distinct life expectancy ages
* Make sure there are no nulls
*/

SELECT * FROM country;

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