The Oracle SELECT statement is used to retrieve data from one or more than one tables, object tables, views, object views etc

Syntax

SELECT expressions  
FROM tables  
WHERE conditions;   

Parameters

1- expressions: It specifies the columns or calculations that you want to retrieve

2- tables:This parameter specifies the tables that you want to retrieve records from. There must be at least one table within the FROM clause

3- conditions: It specifies the conditions that must be followed for selection

Select Example: select all fields

Let's take an example to select all fields from an already created table named customers

SELECT *  FROM customers;   

output

Select Example: select specific fields

Example

SELECT age, address, salary  
FROM customers  
WHERE  age < 25  
AND salary > '20000'  
ORDER BY age ASC, salary DESC;  

Select Example: select fields from multiple tables (JOIN)

SELECT customers.name, courses.trainer  
FROM courses  
INNER JOIN customers  
ON courses.course_id = course_id  
ORDER BY name;   

output