Add new challenges

src/data/courses/sql/chapters/data-definition-language/lessons/constraints-challenge.md

@@ -0,0 +1,40 @@
+---
+title: Constraints Challenge
+description: Create a table for bookstore inventory using various SQL constraints
+order: 320
+type: challenge
+initSteps: []
+expectedResults:
+  - columns: [message]
+    values:
+      - ['Table created successfully']
+---
+
+You need to create a table named `book_inventory` for a bookstore system. The table should track detailed information about books using appropriate data types and constraints listed below.
+
+| Column       | Data Type        | Constraints                                  |
+| ------------ | ---------------- | -------------------------------------------- |
+| id           | `INTEGER`        | Primary Key                                  |
+| isbn         | `VARCHAR(13)`    | Null values not allowed and must be unique   |
+| title        | `VARCHAR(200)`   | Null values not allowed                      |
+| author       | `VARCHAR(100)`   | Null values not allowed                      |
+| price        | `DECIMAL(10, 2)` | Null values not allowed and must be positive |
+| pages        | `INTEGER`        | Must be positive                             |
+| in_stock     | `BOOLEAN`        | Not null and default true                    |
+| publish_year | `INTEGER`        | Not null                                     |
+| last_updated | `TIMESTAMP`      | Not null and default `CURRENT_TIMESTAMP`     |
+
+## Expected Output
+
+After executing your query, the table should be created successfully with all specified columns and constraints.
+
+## Notes
+
+This challenge tests your knowledge of:
+
+- SQL data types (INTEGER, VARCHAR, DECIMAL, BOOLEAN, DATE, TIMESTAMP)
+- Primary key and unique constraints
+- NOT NULL constraints
+- DEFAULT values
+- CHECK constraints for data validation
+- Working with date and time data types

src/data/courses/sql/chapters/data-definition-language/lessons/data-types-challenge.md

@@ -0,0 +1,31 @@
+---
+title: Data Types Challenge
+description: Create a table for bookstore inventory using appropriate SQL data types
+order: 310
+type: challenge
+initSteps: []
+expectedResults:
+  - columns: [message]
+    values:
+      - ['Table created successfully']
+---
+
+You need to create a table named `book_inventory` for a bookstore system. The table should track detailed information about books using appropriate data types.
+
+| Column           | Description                                    |
+| ---------------- | ---------------------------------------------- |
+| id               | Whole numbers for identification (Primary Key) |
+| isbn             | Text of exactly 13 characters                  |
+| title            | Variable-length text up to 200 characters      |
+| author           | Variable-length text up to 100 characters      |
+| price            | Number with 2 decimal places and precision 10  |
+| pages            | Whole number                                   |
+| in_stock         | True/False value                               |
+| publication_date | Date only (no time)                            |
+| last_updated     | Date and time together                         |
+
+The only constraint you need to implement is that the `id` column should be a primary key. Apart from that, you are only being tested on the data types.
+
+## Expected Output
+
+After executing your query, the table should be created successfully with all specified columns using appropriate data types.

src/data/courses/sql/chapters/data-definition-language/lessons/data-types-in-sqlite.md

@@ -50,7 +50,7 @@ The output will be:
 | --- | -------- | ----------- |
 | 1   | John Doe | Twenty Five |
 
-You should also note that SQLite supports only a few data types: `INTEGER`, `REAL`, `TEXT`, `BLOB`, and `NULL`. Other data types such as `DECIMAL`, `FLOAT`, `VARCHAR`, etc., are not supported, although it will not complain if you try to assign them to a column.
+You should also note that SQLite supports only a few data types: `INTEGER`, `REAL`, `TEXT`, `BLOB`, and `NULL`. Other data types such as  `DECIMAL`, `FLOAT`, `VARCHAR`, etc., are not supported, although it will not complain if you try to assign them to a column.
 
 For more details, check the [SQLite data types](https://www.sqlite.org/datatype3.html) and [why it uses dynamic typing](https://www.sqlite.org/flextypegood.html) in the official documentation.
 

src/data/courses/sql/chapters/data-definition-language/lessons/simple-table-creation.md

@@ -0,0 +1,27 @@
+---
+title: Simple Table Creation
+description: Write a SQL query to create a `books` table with specific columns.
+order: 300
+type: challenge
+initSteps: []
+expectedResults:
+  - columns: [message]
+    values:
+      - ['Table created successfully']
+---
+
+You are required to create a table named `books` for a bookstore database. The table should have the following columns:
+
+| Column Name    | Data Type      |
+| -------------- | -------------- |
+| id             | `INTEGER`      |
+| title          | `VARCHAR(250)` |
+| author         | `VARCHAR(250)` |
+| genre          | `VARCHAR(250)` |
+| published_date | `DATE`         |
+
+Create a simple table with these columns using basic data types.
+
+## Expected Output
+
+After executing the query, there should be no errors and the table should be created successfully. You can verify the schema under the `Schema` tab.

src/data/courses/sql/chapters/data-definition-language/lessons/table-creation.md

@@ -1,32 +0,0 @@
----
-title: Table Creation
-description: Write a SQL query to create a `books` table with specific columns.
-order: 300
-type: challenge
-initSteps: []
-expectedResults:
-  - columns: [message]
-    values:
-      - ['Table created successfully']
----
-
-You are required to create a table named `books` for a bookstore database. The table should have the following columns:
-
-| Column Name    | Data Type      | Constraints       |
-| -------------- | -------------- | ----------------- |
-| id             | INTEGER        | PRIMARY KEY       |
-| title          | VARCHAR(250)   | NOT NULL          |
-| author         | VARCHAR(250)   | NOT NULL          |
-| genre          | VARCHAR(250)   |                   |
-| price          | DECIMAL(10, 2) | CHECK (price > 0) |
-| published_date | DATE           |                   |
-
-Table should have following constraints in place:
-
-- The `id` column should uniquely identify each book.
-- The `title` and `author` columns cannot be `NULL`.
-- The `price` column must be greater than `0`.
-
-## Expected Output
-
-After executing the query, there should be no errors and the table should be created successfully.

src/styles/global.css

@@ -59,6 +59,14 @@ p > code:before,
 .prose ol li > code:before,
 p > code:before,
 .prose ol li > code:after,
+.course-content h1 > code:after,
+.course-content h1 > code:before,
+.course-content h2 > code:after,
+.course-content h2 > code:before,
+.course-content h3 > code:after,
+.course-content h3 > code:before,
+.course-content h4 > code:after,
+.course-content h4 > code:before,
 p > code:after,
 a > code:after,
 a > code:before {
@@ -73,13 +81,16 @@ a > code:before {
 .course-content em > code,
 .course-content h1 > code,
 .course-content h2 > code,
-.course-content h3 > code {
+.course-content h3 > code,
+.course-content table code {
   background: #f4f4f5 !important;
   border: 1px solid #282a36 !important;
   color: #282a36 !important;
   padding: 2px 4px;
   border-radius: 5px;
-  font-size: 17px !important;
+  font-size: 16px !important;
+  white-space: pre;
+  font-weight: normal;
 }
 
 .course-content.prose blockquote h1,