diff --git a/queries.md b/queries.md index b06f900..290484c 100644 --- a/queries.md +++ b/queries.md @@ -7,7 +7,9 @@ 1. Using an **INNER JOIN**, list all books (left table) that have an assigned author (right table). The result should include only books with assigned authors. ```sql --- Your Query Goes Here +SELECT b.title, a.name AS author_name, a.nationality, a.birth_year +FROM books b +INNER JOIN authors a ON b.author_id = a.id; ```
@@ -15,7 +17,9 @@ 2. Using a **LEFT JOIN**, list all authors (left table) and their corresponding books on the (right table). The result should include all authors, including those who don't have any books assigned. ```sql --- Your Query Goes Here +SELECT a.name AS author_name, a.nationality, a.birth_year, b.title, b.publish_date +FROM authors a +LEFT JOIN books b ON a.id = b.author_id; ```
@@ -23,7 +27,9 @@ 3. Using a **RIGHT JOIN**, list all books (right table) and their corresponding authors on the (left table). The result should include books without assigned authors. ```sql --- Your Query Goes Here +SELECT a.name AS author_name, a.nationality, b.title, b.publish_date +FROM authors a +RIGHT JOIN books b ON a.id = b.author_id; ```
@@ -31,7 +37,9 @@ 4. Using a **FULL JOIN**, list all records from the `books` and `authors` tables. The result should include all details from both tables, even if there are no match. ```sql --- Your Query Goes Here +SELECT a.name AS author_name, a.nationality, a.birth_year, b.title, b.publish_date +FROM authors a +FULL JOIN books b ON a.id = b.author_id; ```
@@ -41,7 +49,9 @@ 1. Using an **INNER JOIN**, list all books (left table) and their corresponding publishers on the (right table). The result should include the book's title, publisher's name, and location. ```sql --- Your Query Goes Here +SELECT b.title, p.name AS publisher_name, p.location +FROM books b +INNER JOIN publishers p ON b.publisher_id = p.id; ```
@@ -49,7 +59,9 @@ 2. Using a **LEFT JOIN**, list all publishers (left table) and any books they have published on the (right table). The result should include all publishers, including those who haven't published any books. ```sql --- Your Query Goes Here +SELECT p.name AS publisher_name, p.location, p.founded_year, b.title, b.publish_date +FROM publishers p +LEFT JOIN books b ON p.id = b.publisher_id; ```
@@ -57,7 +69,9 @@ 3. Using a **RIGHT JOIN**, list all books (right table) and their corresponding publishers on the (left table). The result should include all books, even those without a linked publisher. ```sql --- Your Query Goes Here +SELECT p.name AS publisher_name, p.location, b.title, b.publish_date +FROM publishers p +RIGHT JOIN books b ON p.id = b.publisher_id; ```
@@ -65,7 +79,12 @@ 4. Using a **FULL JOIN**, list all records from the `authors`, `books`, and `publishers` tables. The result should include all records from the three tables, even if there are no matches between them. ```sql --- Your Query Goes Here +SELECT a.name AS author_name, a.nationality, a.birth_year, + b.title, b.publish_date, + p.name AS publisher_name, p.location, p.founded_year +FROM authors a +FULL JOIN books b ON a.id = b.author_id +FULL JOIN publishers p ON b.publisher_id = p.id; ```