Published by : Obay Salah , December 1, 2024

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

oracle select output 1


Select Example: select specific fields

Example

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

oracle select output 2


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

oracle select output 3

Tags : SQL

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