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Quick recap of essential SQL basics 😄👇

SQL is a domain-specific language used for managing and querying relational databases. It's crucial for interacting with databases, retrieving, storing, updating, and deleting data. Here are some fundamental SQL concepts:

1. Database
- A database is a structured collection of data. It's organized into tables, and SQL is used to manage these tables.

2. Table
- Tables are the core of a database. They consist of rows and columns, and each row represents a record, while each column represents a data attribute.

3. Query
- A query is a request for data from a database. SQL queries are used to retrieve information from tables. The SELECT statement is commonly used for this purpose.

4. Data Types
- SQL supports various data types (e.g., INTEGER, TEXT, DATE) to specify the kind of data that can be stored in a column.

5. Primary Key
- A primary key is a unique identifier for each row in a table. It ensures that each row is distinct and can be used to establish relationships between tables.

6. Foreign Key
- A foreign key is a column in one table that links to the primary key in another table. It creates relationships between tables in a database.

7. CRUD Operations
- SQL provides four primary operations for data manipulation:
- Create (INSERT) - Add new records to a table.
- Read (SELECT) - Retrieve data from one or more tables.
- Update (UPDATE) - Modify existing data.
- Delete (DELETE) - Remove records from a table.

8. WHERE Clause
- The WHERE clause is used in SELECT, UPDATE, and DELETE statements to filter and conditionally manipulate data.

9. JOIN
- JOIN operations are used to combine data from two or more tables based on a related column. Common types include INNER JOIN, LEFT JOIN, and RIGHT JOIN.

10. Index
- An index is a database structure that improves the speed of data retrieval operations. It's created on one or more columns in a table.

11. Aggregate Functions
- SQL provides functions like SUM, AVG, COUNT, MAX, and MIN for performing calculations on groups of data.

12. Transactions
- Transactions are sequences of one or more SQL statements treated as a single unit. They ensure data consistency by either applying all changes or none.

13. Normalization
- Normalization is the process of organizing data in a database to minimize data redundancy and improve data integrity.

14. Constraints
- Constraints (e.g., NOT NULL, UNIQUE, CHECK) are rules that define what data is allowed in a table, ensuring data quality and consistency.

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Hope it helps :)

⌨️ Fetch API in JavaScript ✨

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😉😌😍🥰😉😌😇🙂
ʟɪꜱᴛ ᴏꜰ ᴘʀᴇᴍɪᴜᴍ ʟᴇᴀʀɴɪɴɢ ᴄʜᴀɴɴᴇʟ

1⃣. 𝗕𝗶𝗻𝗻𝗶𝗻𝗴 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝟱$

2⃣. 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 & 𝗗𝗼𝗰𝘀 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝟱𝟱$

3⃣. 𝗛𝗮𝗰𝗸𝗶𝗻𝗴 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝟮𝟱$

4⃣. 𝗖𝗿𝗮𝗰𝗸𝗶𝗻𝗴 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝟯𝟬$

5⃣. 𝗖𝗮𝗿𝗱𝗶𝗻𝗴 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝟰𝟬$

6⃣. 𝗦𝗽𝗮𝗺𝗺𝗶𝗻𝗴 𝗖𝗵𝗮𝗻𝗻𝗲𝗹 𝟱𝟬$

7⃣. 𝗦𝗵𝗮𝗿𝗲 𝗮𝗻𝗱 𝗦𝘁𝗼𝗰𝗸 𝗠𝗮𝗿𝗸𝗲𝘁 𝗖𝗼𝘂𝗿𝘀𝗲𝘀 𝟭𝟱$

𝐵𝑢𝑦 𝑀𝑒𝑚𝑏𝑒𝑟𝑠ℎ𝑖𝑝 𝑇𝑜𝑑𝑎𝑦.
⭐️⭐️💰

For example:

Go to Profile → <a>

Submit Form → <button>

Open Article → <a>

Delete Account → <button>

🧠 Remember

<a>

↓

Creates a link

href

↓

Specifies destination

target="_blank"

↓

Opens in a new browsing context

id

↓

Can create a destination within the same page

Key Takeaway

The <a> element connects the web together.

Page A

↓

<a href="page-b.html">

↓

Page B

Without links, navigating between webpages would be much harder.

Double Tap ❤️ For More

🌐 Web Development Roadmap — Part 16

HTML Links — Tag

Links are one of the most important parts of the web. They allow users to move from one page or website to another.

1. Creating a Link

HTML uses the <a> (anchor) element to create links.



<a href="https://www.google.com">Visit Google</a>

The browser displays:

Visit Google

When the user clicks it, the browser navigates to the specified URL.

2. The href Attribute

href stands for Hypertext Reference.

<a href="https://example.com">Visit Website</a>

Here:

<a> → Creates the link

href → Specifies where the link goes

URL → Destination

Text → What the user clicks

3. Linking to Another Page

Suppose your project contains:

my-website/
├── index.html
├── about.html
└── contact.html

From index.html:

<a href="about.html">About Me</a>

<a href="contact.html">Contact</a>

These are called relative links because they point to files within your website.

4. Linking to Another Website

You can also link to an external website:

<a href="https://www.example.com">
Visit Example
</a>

The complete URL is used for an external destination.

5. Opening a Link in a New Tab

You can use target="_blank":

<a href="https://www.example.com" target="_blank">
Visit Website
</a>

This tells the browser to open the destination in a new browsing context, commonly a new tab.

For external links, it's also good practice to use:

<a
href="https://www.example.com"
target="_blank"
rel="noopener noreferrer">
Visit Website
</a>

6. Email Links

You can create a link that opens the user's email application:

<a href="mailto:hello@example.com">
Send Email
</a>

7. Telephone Links

You can create a clickable phone link:

<a href="tel:+911234567890">
Call Us
</a>

This is especially useful on mobile websites.

8. Linking to a Section on the Same Page

You can jump to a specific section using an id.

<a href="#contact">Go to Contact</a>

<h2 id="contact">Contact Me</h2>

The flow is:

Click "Go to Contact"

↓

Find id="contact"

↓

Jump to that section

9. Navigation Menu Example

A simple website navigation could look like:

<nav>
<a href="index.html">Home</a>
<a href="about.html">About</a>
<a href="projects.html">Projects</a>
<a href="contact.html">Contact</a>
</nav>

This creates the foundation of a website's navigation.

10. Link vs Button

This is important.

Use a link when the user is going somewhere:

<a href="about.html">About Me</a>

Use a button when the user is performing an action:

<button>Submit</button>

<h1>Web Development</h1>

<p>
Web development is the process of creating websites
and web applications.
</p>

<h2>Frontend Development</h2>

<p>
<strong>HTML</strong> provides structure,
<strong>CSS</strong> provides styling,
and <strong>JavaScript</strong> adds behaviour.
</p>

<h3>Important Technologies</h3>

<p>
Learn <em>HTML</em> first, then move to CSS and JavaScript.
</p>

<hr>

<h2>My Learning Journey</h2>

<p>
I am learning <mark>web development</mark> step by step.
</p>

🧠 Remember

• <h1> → Main page heading

• <h2> → Major section

• <h3> → Subsection

• <p> → Paragraph

• <strong> → Strong importance

• <em> → Emphasis

• <br> → Line break

• <hr> → Thematic break

• <mark> → Highlighted text

• <small> → Smaller/side text

Key Takeaway

HTML text elements are not just about making text look different. They help create a meaningful structure and hierarchy that browsers, search engines, accessibility tools, and users can understand.

Double Tap ❤️ For Part-16