Oracle SELECT Statement

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.

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

SELECT *
FROM customers; 

output

Example

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

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

output

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