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[vercel]

The file has three unnecessary blank lines before the YAML opening delimiter, which is unconventional and could cause parsing issues depending on the documentation system.

View Details

📝 Patch Details

diff --git a/docs/sql/SQL-basics/Operators.md b/docs/sql/SQL-basics/Operators.md
index 50fd12f..b35209b 100644
--- a/docs/sql/SQL-basics/Operators.md
+++ b/docs/sql/SQL-basics/Operators.md
@@ -1,6 +1,4 @@
-
-
-- ---
+---
 id: sql-operators
 title: SQL Operators
 sidebar_label: SQL Operators
@@ -67,3 +65,172 @@ SELECT id, price, quantity,
        price * quantity AS total_value,
        price + 2.00 AS price_with_tax
 FROM products;
+```
+
+This returns:
+```
+| id | price | quantity | total_value | price_with_tax |
+|----|-------|----------|-------------|----------------|
+| 1  | 15.99 | 10       | 159.90      | 17.99          |
+| 2  | 25.50 | 5        | 127.50      | 27.50          |
+```
+
+---
+
+## ## Comparison Operators (Finding What You Need)
+
+These help you compare values and find specific data:
+
+* `=`: Equal to
+* `<>` or `!=`: Not equal to  
+* `<`: Less than
+* `>`: Greater than
+* `<=`: Less than or equal to
+* `>=`: Greater than or equal to
+
+**Example:**
+
+```sql
+CREATE TABLE students (
+    id INT,
+    name VARCHAR(50),
+    age INT,
+    gpa DECIMAL(3, 2)
+);
+
+INSERT INTO students VALUES 
+(1, 'Alice', 20, 3.75),
+(2, 'Bob', 19, 2.50),
+(3, 'Charlie', 21, 3.90);
+
+-- Find students older than 19
+SELECT * FROM students WHERE age > 19;
+
+-- Find students with perfect or near-perfect GPA
+SELECT * FROM students WHERE gpa >= 3.70;
+```
+
+---
+
+## ## Logical Operators (Combining Conditions)
+
+Combine multiple conditions to get exactly what you need:
+
+* `AND`: Both conditions must be true
+* `OR`: At least one condition must be true  
+* `NOT`: Opposite of the condition
+
+**Example:**
+
+```sql
+-- Find students who are adults (>= 18) AND have good grades (>= 3.0)
+SELECT * FROM students WHERE age >= 18 AND gpa >= 3.0;
+
+-- Find students who are either very young OR have excellent grades
+SELECT * FROM students WHERE age < 20 OR gpa >= 3.8;
+
+-- Find students who do NOT have failing grades
+SELECT * FROM students WHERE NOT gpa < 2.0;
+```
+
+---
+
+## ## Pattern Matching with LIKE
+
+The `LIKE` operator is perfect for searching text patterns:
+
+* `%`: Matches any number of characters
+* `_`: Matches exactly one character
+
+**Example:**
+
+```sql
+CREATE TABLE customers (
+    id INT,
+    name VARCHAR(50),
+    email VARCHAR(100)
+);
+
+INSERT INTO customers VALUES 
+(1, 'Alice Johnson', '[email protected]'),
+(2, 'Bob Smith', '[email protected]'),
+(3, 'Alice Brown', '[email protected]');
+
+-- Find all customers named Alice
+SELECT * FROM customers WHERE name LIKE 'Alice%';
+
+-- Find Gmail users
+SELECT * FROM customers WHERE email LIKE '%@gmail.com';
+
+-- Find names with exactly 3 letters in first name
+SELECT * FROM customers WHERE name LIKE '___  %';
+```
+
+---
+
+## ## Range and Set Operators
+
+Check if values fall within ranges or sets:
+
+* `BETWEEN`: Value falls within a range
+* `IN`: Value matches any in a list
+* `IS NULL` / `IS NOT NULL`: Check for missing data
+
+**Example:**
+
+```sql
+-- Find students aged between 19 and 21
+SELECT * FROM students WHERE age BETWEEN 19 AND 21;
+
+-- Find students from specific cities
+SELECT * FROM students WHERE city IN ('New York', 'Los Angeles', 'Chicago');
+
+-- Find students who haven't provided an email
+SELECT * FROM students WHERE email IS NULL;
+```
+
+---
+
+## ## Putting It All Together: Real-World Query
+
+Let's combine operators in a practical scenario:
+
+```sql
+-- Find active students who:
+-- - Are adults (>= 18)
+-- - Have good grades (>= 3.0) 
+-- - Are either Computer Science majors OR have excellent grades (>= 3.8)
+-- - Enrolled this year
+
+SELECT name, age, gpa, major, enrollment_date
+FROM students 
+WHERE age >= 18 
+  AND gpa >= 3.0 
+  AND (major = 'Computer Science' OR gpa >= 3.8)
+  AND enrollment_date >= '2023-01-01'
+  AND is_active = TRUE
+ORDER BY gpa DESC;
+```
+
+:::warning Common Mistakes to Avoid
+- **NULL comparisons**: Use `IS NULL`, not `= NULL`  
+- **String comparisons**: Use single quotes for text: `name = 'Alice'`
+- **Date formats**: Use proper format: `'YYYY-MM-DD'`
+- **Operator precedence**: Use parentheses to group conditions clearly
+:::
+
+---
+
+## ✅ What You've Learned
+
+Fantastic! You now understand:
+
+* **Arithmetic operators**: For calculations (`+`, `-`, `*`, `/`, `%`)
+* **Comparison operators**: For filtering (`=`, `<>`, `<`, `>`, `<=`, `>=`)  
+* **Logical operators**: For combining conditions (`AND`, `OR`, `NOT`)
+* **Pattern matching**: With `LIKE` and wildcards (`%`, `_`)
+* **Range/Set operators**: `BETWEEN`, `IN`, `IS NULL`
+
+These operators are your tools for writing precise, powerful SQL queries. Practice combining them to filter and find exactly the data you need!
+
+**Next up**: Learn about SQL functions to transform and manipulate your data even further!
\ No newline at end of file
diff --git a/docs/sql/SQL-basics/datatypes.md b/docs/sql/SQL-basics/datatypes.md
index d371913..994c162 100644
--- a/docs/sql/SQL-basics/datatypes.md
+++ b/docs/sql/SQL-basics/datatypes.md
@@ -1,6 +1,3 @@
-
-
-
 ---
 id: sql-datatypes
 title: SQL Data Types

Analysis

YAML frontmatter not parsed due to leading blank lines in Markdown files

What fails: Docusaurus/gray-matter cannot parse YAML frontmatter when there are blank lines before the opening --- delimiter, causing metadata fields (id, title, sidebar_label, etc.) to be ignored.

How to reproduce:

# Test with gray-matter (the parser Docusaurus uses):
echo -e '\n\n---\nid: test\ntitle: Test\n---\n# Content' > test.md
node -e "console.log(require('gray-matter')(require('fs').readFileSync('test.md', 'utf8')).data)"
# Result: {} (empty - frontmatter not parsed)

# Compare with proper format:
echo -e '---\nid: test\ntitle: Test\n---\n# Content' > test2.md  
node -e "console.log(require('gray-matter')(require('fs').readFileSync('test2.md', 'utf8')).data)"
# Result: { id: 'test', title: 'Test' } (frontmatter parsed correctly)

Expected: YAML frontmatter should be parsed according to Docusaurus documentation: "Front matter is provided at the very top of the file, enclosed by three dashes ---"

Found in files: docs/sql/SQL-basics/datatypes.md (3 blank lines), docs/sql/SQL-basics/Operators.md (1 blank line)

[vercel]

The YAML frontmatter is malformed with missing commas in the tags array and a missing closing --- delimiter before the content starts, which will cause parsing errors.

View Details

📝 Patch Details

diff --git a/docs/Technical/intro-github.md b/docs/Technical/intro-github.md
index c341e97..aabd51b 100644
--- a/docs/Technical/intro-github.md
+++ b/docs/Technical/intro-github.md
@@ -5,13 +5,18 @@ sidebar_label: Introduction of GitHub #displays in sidebar
 sidebar_position: 1
 tags:
   [
-    GitHub,git,version control
-    Introduction of GitHub,
-    What is GitHub, open source
-    Why learn GitHub,beginner guide
-    How to use GitHub,
+    "GitHub",
+    "git",
+    "version control",
+    "Introduction of GitHub",
+    "What is GitHub",
+    "open source",
+    "Why learn GitHub",
+    "beginner guide",
+    "How to use GitHub",
   ]
 description: New to GitHub? This beginner's guide explains what Git and GitHub are, why they're essential for developers, and how to start your open-source journey. Learn key concepts like repositories, commits, and pull requests.
+---
 
 GitHub is a web-based platform used for version control and collaboration. It allows developers to work together on projects from anywhere in the world. GitHub is built on top of Git, a distributed version control system created by Linus Torvalds in 2005.
 

Analysis

YAML frontmatter parsing failure in docs/Technical/intro-github.md

What fails: Docusaurus build fails with YAMLException when parsing frontmatter in docs/Technical/intro-github.md

How to reproduce:

npm run build

Result: Build fails with error "can not read a block mapping entry; a multiline key may not be an implicit key at line 19, column 23"

Expected: Build should succeed. YAML frontmatter requires proper comma-separated array syntax and closing --- delimiter per Docusaurus frontmatter documentation

Root cause:

1. Missing commas between tags array elements
2. Missing closing --- delimiter after description field