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Update SQL queries in queries.md for JOIN operations #32

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Update SQL queries in queries.md for JOIN operations #32

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32 changes: 24 additions & 8 deletions queries.md
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Original file line number Diff line number Diff line change
Expand Up @@ -6,32 +6,42 @@

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 name
FROM books
INNER JOIN authors
ON books.id = authors.id

<br>

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 authors.name, books.title
FROM authors
INNER JOIN books
ON authors.id = books.author_id
```

<br>

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 books.title, authors.name
FROM books
INNER JOIN authors
ON books.id = authors.id
```

<br>

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 books.title, authors.id
FROM books
FULL JOIN authors
ON books.author_id = authors.id
```

<br>
Expand All @@ -41,15 +51,21 @@
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 publishers.name, publishers.location
FROM publishers
INNER JOIN books
ON publishers.id = books.publisher_id
```

<br>

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 publishers.name, books.title
FROM publishers
LEFT JOIN books
ON publishers.id = books.publisher_id
```

<br>
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