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Update questions.sql #82

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22 changes: 20 additions & 2 deletions SQL Deep Dive/Like Operator/questions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,9 @@
* Sample output: https://imgur.com/vXs4093
* Use EXTRACT (YEAR FROM AGE(birth_date)) we will learn about this in later parts of the course
*/
SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
SELECT first_name, EXTRACT (YEAR FROM AGE(birth_date)) as "age"
FROM employees
WHERE first_name LIKE 'M%';


/*
Expand All @@ -14,6 +16,12 @@ SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
* Question: How many people's name start with A and end with R?
* Expected output: 1846
*/
select COUNT(first_name)
from employees
WHERE first_name ILIKE 'A%R';





/*
Expand All @@ -22,7 +30,11 @@ SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
* Question: How many people's zipcode have a 2 in it?.
* Expected output: 4211
*/
SELECT COUNT(*)
FROM customers
WHERE CAST(zip AS TEXT) LIKE '%2%';

number of people with 2 in their zipcode is = 4211


/*
Expand All @@ -31,6 +43,9 @@ SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
* Question: How many people's zipcode start with 2 with the 3rd character being a 1.
* Expected output: 109
*/
SELECT COUNT(*)
FROM customers
where cast(zip as text) LIKE '2_1%';


/*
Expand All @@ -39,5 +54,8 @@ SELECT ..., EXTRACT (YEAR FROM AGE(birth_date)) as "age" FROM employees;
* Question: Which states have phone numbers starting with 302?
* Replace null values with "No State"
* Expected output: https://imgur.com/AVe6G4c
*/
*/SELECT COALESCE(state, 'no state') AS State
FROM customers
WHERE phone LIKE '302%'