Add inserting and updating challenges

src/data/courses/sql/chapters/manipulating-data/lessons/inserting-customers.md

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+---
+title: Inserting Customers
+description: Learn how to insert data into a table.
+order: 100
+type: challenge
+setup: |
+  ```sql
+  - CREATE TABLE customers (  
+    id INTEGER PRIMARY KEY,  
+    name TEXT,  
+    phone TEXT,  
+    email TEXT  
+    );  
+  - INSERT INTO customers (id, name, phone, email)  
+    VALUES  
+    (1, 'John', '555-123-4567', 'john@example.com'),  
+    (2, 'Jane', '555-987-6543', 'jane@example.com'),  
+    (3, 'Bob', NULL, 'bob@example.com');
+expectedResults:
+  - columns: [id, name, phone, email]
+    values:
+      - [1, 'John', '555-123-4567', 'john@example.com']
+      - [2, 'Jane', '555-987-6543', 'jane@example.com']
+      - [3, 'Bob', NULL, 'bob@example.com']
+---
+
+Given the following `customers` table:
+
+| id  | name | phone        | email            |
+| --- | ---- | ------------ | ---------------- |
+| 1   | John | 555-123-4567 | john@example.com |
+| 2   | Jane | 555-987-6543 | jane@example.com |
+| 3   | Bob  | NULL         | bob@example.com  |
+
+Write a query to insert the following two new customers:
+
+| Column  | Customer 1        | Customer 2        |
+| ------- | ----------------- | ----------------- |
+| `id`    | 4                 | 5                 |
+| `name`  | Alice             | Smith             |
+| `phone` | 555-444-3333      | `NULL`            |
+| `email` | alice@example.com | smith@example.com |
+
+## Result
+
+After running your query, the `customers` table should look like this:
+
+| id  | name  | phone        | email             |
+| --- | ----- | ------------ | ----------------- |
+| 1   | John  | 555-123-4567 | john@example.com  |
+| 2   | Jane  | 555-987-6543 | jane@example.com  |
+| 3   | Bob   | NULL         | bob@example.com   |
+| 4   | Alice | 555-444-3333 | alice@example.com |
+| 5   | Smith | NULL         | smith@example.com |

src/data/courses/sql/chapters/manipulating-data/lessons/updating-bookstore.md

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+---
+title: Updating Bookstore
+description: Practice updating multiple rows with different conditions
+order: 120
+type: challenge
+setup: |
+  ```sql
+  CREATE TABLE books (
+      id INTEGER PRIMARY KEY,
+      title VARCHAR(100),
+      category VARCHAR(50),
+      price DECIMAL(10,2),
+      stock INTEGER
+  );
+
+  INSERT INTO books (id, title, category, price, stock) VALUES
+      (1, 'The Great Gatsby', 'Fiction', 24.99, 15),
+      (2, 'SQL Basics', 'Technical', 39.99, 8),
+      (3, '1984', 'Fiction', 19.99, 12),
+      (4, 'Poetry Collection', 'Poetry', 14.99, 50),
+      (5, 'Database Design', 'Technical', 44.99, 20);
+  ```
+---
+
+Given the following `books` table:
+
+| id  | title             | category  | price | stock |
+| --- | ----------------- | --------- | ----- | ----- |
+| 1   | The Great Gatsby  | Fiction   | 24.99 | 15    |
+| 2   | SQL Basics        | Technical | 39.99 | 8     |
+| 3   | 1984              | Fiction   | 19.99 | 12    |
+| 4   | Poetry Collection | Poetry    | 14.99 | 50    |
+| 5   | Database Design   | Technical | 44.99 | 20    |
+
+Write the following update statements to make updates to the table:
+
+1. Write a query to apply a 25% discount to all `Technical` books (multiply the price by 0.75)
+2. Write another query to add "(Sale Edition)" to the titles of books that cost more than $25 after the previous update.
+3. Write a final query to increase the stock of books with less than 10 in stock by 5.
+
+## Expected Results
+
+After your updates, the table should look like this:
+
+| id  | title                         | category  | price | stock |
+| --- | ----------------------------- | --------- | ----- | ----- |
+| 1   | The Great Gatsby              | Fiction   | 24.99 | 15    |
+| 3   | 1984                          | Fiction   | 19.99 | 12    |
+| 4   | Poetry Collection             | Poetry    | 14.99 | 50    |
+| 5   | Database Design(Sale Edition) | Technical | 33.74 | 20    |
+| 2   | SQL Basics(Sale Edition)      | Technical | 29.99 | 13    |
+
+> You can run multiple UPDATE statements in a single query. Just separate them with a semicolon.