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Oracle from clause

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What is Oracle FROM clause ?

  • FROM clause is a mandatory clause in SELECT expression.
  • It specifies the tables from which data is to be retrieved.
  • The Oracle/PLSQL FROM clause is used to list the tables and any join information required for the Oracle query.

Syntax:

FROM table_name...
                   Expressions...
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Oracle FROM Clause Example: (with one table)

  • Let's take an example to explain how to use FROM clause to retrieve data from one table. Consider a table "customers".

Customer table:

CREATE TABLE  "CUSTOMERS" 
   (	"NAME" VARCHAR2(4000), 
	"AGE" NUMBER, 
	"SALARY" NUMBER, 
	"STATE" VARCHAR2(4000)
   )
/
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 customer table from clause

Execute this query

SELECT *
FROM customers
WHERE salary >= 20000
ORDER BY salary ASC;
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Output:

 oracle from clause one output

Oracle FROM Clause Example: (with two tables)

Inner Join example

  • Let's take two tables "suppliers" and "order1".

Suppliers:

 supplier table
 supplier data

Order1:

 supplier order
 supplier order

Execute the following query:

SELECT suppliers.supplier_id, suppliers.supplier_name, order1.order_number
FROM suppliers
INNER JOIN order1
ON suppliers.supplier_id = order1.supplier_id;
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Output:

 supplier order output

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