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-- Practical SQL: A Beginner's Guide to Storytelling with Data
-- by Anthony DeBarros
-- Chapter 2 Code Examples
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-- Listing 2-1: Querying all rows and columns from the teachers table
SELECT * FROM teachers;
-- Listing 2-2: Querying a subset of columns
SELECT last_name, first_name, salary FROM teachers;
-- Listing 2-3: Querying distinct values in the school column
SELECT DISTINCT school
FROM teachers;
-- Listing 2-4: Querying distinct pairs of values in the school and salary
SELECT DISTINCT school, salary
FROM teachers;
-- Listing 2-5: Sorting a column with ORDER BY
SELECT first_name, last_name, salary
FROM teachers
ORDER BY salary DESC;
-- Listing 2-6: Sorting multiple columns with ORDER BY
SELECT last_name, school, hire_date
FROM teachers
ORDER BY school ASC, hire_date DESC;
-- Listing 2-7: Filtering rows using WHERE
SELECT last_name, school, hire_date
FROM teachers
WHERE school = 'Myers Middle School';
-- Examples of WHERE comparison operators
-- Teachers with first name of Janet
SELECT first_name, last_name, school
FROM teachers
WHERE first_name = 'Janet';
-- School names not equal to F.D. Roosevelt HS
SELECT school
FROM teachers
WHERE school != 'F.D. Roosevelt HS';
-- Teachers hired before Jan. 1, 2000
SELECT first_name, last_name, hire_date
FROM teachers
WHERE hire_date < '2000-01-01';
-- Teachers earning 43,500 or more
SELECT first_name, last_name, salary
FROM teachers
WHERE salary >= 43500;
-- Teachers who earn between $40,000 and $65,000
SELECT first_name, last_name, school, salary
FROM teachers
WHERE salary BETWEEN 40000 AND 65000;
-- Listing 2-8: Filtering with LIKE AND ILIKE
SELECT first_name
FROM teachers
WHERE first_name LIKE 'sam%';
SELECT first_name
FROM teachers
WHERE first_name ILIKE 'sam%';
-- Listing 2-9: Combining operators using AND and OR
FROM teachers
WHERE school = 'Myers Middle School'
      AND salary < 40000;
FROM teachers
WHERE last_name = 'Cole'
      OR last_name = 'Bush';
FROM teachers
WHERE school = 'F.D. Roosevelt HS'
      AND (salary < 38000 OR salary > 40000);
-- Listing 2-10: A SELECT statement including WHERE and ORDER BY
SELECT first_name, last_name, school, hire_date, salary
FROM teachers
WHERE school LIKE '%Roos%'
ORDER BY hire_date DESC;

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