diff --git a/SQL Deep Dive/Distinct/questions.sql b/SQL Deep Dive/Distinct/questions.sql index 1ae66a7..a6dbe8d 100644 --- a/SQL Deep Dive/Distinct/questions.sql +++ b/SQL Deep Dive/Distinct/questions.sql @@ -4,7 +4,8 @@ * Question: What unique titles do we have? */ -SELECT * FROM titles; +SELECT DISTINCT title +FROM titles /* @@ -13,7 +14,8 @@ SELECT * FROM titles; * Question: How many unique birth dates are there? */ -SELECT * FROM employees; +SELECT DISTINCT count( birth_date ) +FROM employees /* * DB: World @@ -21,6 +23,6 @@ SELECT * FROM employees; * 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;