Oracle Optimists

https://youtu.be/qN3QNR2H4ww

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The syntax for the SELECT statement in SQL is:

SELECT expressions
FROM tables
[WHERE conditions]
[ORDER BY expression [ ASC | DESC ]];
Parameters or Arguments
expressions
The columns or calculations that you wish to retrieve. Use * if you wish to select all columns.
tables
The tables that you wish to retrieve records from. There must be at least one table listed in the FROM clause.
WHERE conditions
Optional. The conditions that must be met for the records to be selected. If no conditions are provided, then all records will be selected.
ORDER BY expression
Optional. The expression used to sort the records in the result set. If more than one expression is provided, the values should be comma separated.
ASC
Optional. ASC sorts the result set in ascending order by expression. This is the default behavior, if no modifier is provider.
DESC
Optional. DESC sorts the result set in descending order by expression.
DDL/DML for Examples
If you want to follow along with this tutorial, get the DDL to create the tables and the DML to populate the data. Then try the examples in your own database!

Get DDL/DML

Example - Select All Fields from a Table
Let's look at an example that shows how to use the SQL SELECT statement to select all fields from a table.

In this example, we have a table called customers with the following data:

customer_id last_name first_name favorite_website
4000 Jackson Joe abc.com
5000 Smith Jane def.com
6000 Ferguson Samantha abcd.com
7000 Reynolds Allen abcdef.com
8000 Anderson Paige NULL
9000 Johnson Derek abc.com
Now let's demonstrate how the SELECT statement works by selecting all columns from the customers table. Enter the following SELECT statement:

Try It
SELECT *
FROM customers
WHERE favorite_website = 'abc.com'
ORDER BY last_name ASC;
There will be 2 records selected. These are the results that you should see:

customer_id last_name first_name favorite_website
4000 Jackson Joe abc.com
9000 Johnson Derek abc.com
In this example, we've used * to signify that we wish to view all fields from the customers table where the favorite_website is 'abc.com'. The result set is sorted by last_name in ascending order.

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# stands for Structured Query Language and is the standard relational language that is supported by just about every database product. All database professionals should know how to write, troubleshoot, and optimize SQL.
Our tutorial will start with the basics of SQL, such as how to retrieve and manipulate data. Then we will move to the more advanced topics such as how to create tables and views.
With this tutorial, you should be on your way to becoming proficient in writing, executing, and optimizing SQL.
:
#01-SQL_Basics
#02-SQL_Advanced
#03-SQL_Functions
#04-SQL_Tuning
#-------------start------
#01-SQL_Basics
ALIASES
AND
AND & OR
BETWEEN
COMPARISON OPERATORS
DATA TYPES
DELETE
DISTINCT
EXCEPT
EXISTS
FROM
GROUP BY
HAVING
IN
INSERT
INTERSECT
IS NOT NULL
IS NULL
JOIN
LIKE
MINUS
NOT
OR
ORDER BY
SELECT
SELECT LIMIT
SELECT TOP
TRUNCATE
UNION
UNION ALL
UPDATE
WHERE