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SQL is a programming language designed to manipulate and manage data stored in relational databases.

   -  A relational database is a database that organizes information into one or more tables.
   -  A table is a collection of data organized into rows and columns.]


A statement is a string of characters that the database recognizes as a valid command.

   CREATE TABLE creates a new table.
   INSERT INTO adds a new row to a table.
   SELECT queries data from a table.
   UPDATE edits a row in a table.
   ALTER TABLE changes an existing table.
   DELETE FROM deletes rows from a table.

SQL statements that create, edit, and delete data.




// =============================================== //

   WRITE QUERIES

// =============================================== //




## CREATE new table, name celebs ##

CREATE TABLE celebs  


---


## Add a row - insert new record ##

INSERT INTO celebs (id, name, age) VALUES (1, 'Justin Bieber', 21); 


---


## To view the row you just created, under the INSERT statement type 
* view all ##

SELECT * FROM celebs;


---


## SELECT name from celebs ##


SELECT name FROM celebs;


---


## UPDATE edit a row in the table ##

UPDATE celebs 
SET age = 22 
WHERE id = 1; 


---


## WHERE is a clause that indicates which row(s) to update with the new column value. 


## ALTER TABLE Add a new column to table twitter_handle ##

ALTER TABLE celebs ADD COLUMN twitter_handle TEXT; 

SELECT * FROM celebs;


---

## Update the table to include Taylor Swift's twitter ##

UPDATE celebs 
SET twitter_handle = '@taylorswift13' 
WHERE id = 4; 

SELECT * FROM celebs;


---

## Delete all of the rows that have a NULL value in the twitter column. Above SELECT type ##


DELETE FROM celebs WHERE twitter_handle IS NULL;


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