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1. A database is comprised of many tables, and a table stores rows of data in a structured format defined by the table's columns.

2. SQL (Structured Query Language) is the primary language responsible for manipulating data within a relational database management system.

3. When writing SQL queries, you are interacting with rows of data stored in tables contained within a database.

4. Day to day, SQL is used to retrieve data from different tables in databases, and then combine it together to create reports.

5. There are four basic operations that SQL can perform, these are sometimes referred to as CRUD operations - create, read, update, delete).

6. This reference has been prepared for the beginners to help them understand the basic to advanced concepts related to SQL languages.

7. A database, in simplest terms, is an organized collection of data.

8. SQL is a bit like other programming languages in that you have to learn the ‘code’ to make use of it much like other popular languages you may of heard of such as Ruby, C, Python etc.

9. It has a pretty simple syntax, and, almost anyone can start using SQL to create reports within a few minutes.

10. This represents the basic hierarchy of a database.

11. Learn SQL right now, with SQL tutorial app which provide freely by Kiwi Lab!

1. explained almost all the sql subjects .. best app found in this fieldGreat for SQL beginnerExcellent app.

2. Has good questions.Please add PLSQL WITH OUTPUT!!!👌Good app .

3. I study from it all the time.

1. Fix SQL Tutorial Not Working/Crashes/Errors/Unresponsive & Black/White screen:

1. Restart SQL Tutorial: Restarting the app will resolve most errors.
2. Update the SQL Tutorial App. Here is how:
   1. On Android goto PlayStore » Search for "SQL Tutorial" » Open SQL Tutorial - Kiwi Learn » click "Update".
   2. On iPhone, goto AppStore » Your profile » Available Updates » Check for SQL Tutorial » click "UPDATE".
3. Clear SQL Tutorial - Kiwi Learn app cache: Clearing cached data will force your app to retrieve the latest data directly from SQL Tutorial servers.
   1. On Android, goto Settings » Apps » Select "SQL Tutorial - Kiwi Learn" » click Storage » click "Clear Cache".
4. Check SQL Tutorial app permissions. If any of these permissions required to use your device's features are disenabled, SQL Tutorial might not work.
5. Uninstall and reinstall SQL Tutorial. If nothing else has worked, completely uninstall SQL Tutorial then reinstall.
6. Restart your device. Last, restarting your device can often clear most problems causing SQL Tutorial not working

2. Fix SQL Tutorial Server issues & Internet Connection

1. Check network connection: An unstable Internet will make SQL Tutorial be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
2. Disable VPN: VPN can cause connection errors and lead to SQL Tutorial not working. Make sure all VPNs are off
3. Enable background data: When Background data is turned off, SQL Tutorial may not be able to connect to the Internet when running in the background.