WHERE - (Oracle Misc)

In Oracle, the WHERE clause is used to filter records based on a specific condition. It is used with the SELECT, UPDATE, and DELETE statements to limit the number of records affected by the statement.

Syntax

The syntax for using the WHERE clause in Oracle is as follows:

SELECT column1, column2, ...
FROM table_name
WHERE condition;

Here, SELECT is the statement that selects the columns to be displayed, table_name is the name of the table from which data is to be retrieved, and condition is the condition that the records must meet to be included in the result set.

Example

Consider the following example:

SELECT *
FROM employees
WHERE department = 'Sales';

This statement retrieves all employees from the "employees" table who belong to the "Sales" department.

Output

The output of the above query would depend on the data in the "employees" table. It would display the records from the "employees" table with "Sales" department.

Explanation

The WHERE clause in the above example filters out only those records from the "employees" table where the department column has the value "Sales". This filters out all other employees who don't belong to the "Sales" department.

Use

The WHERE clause is used to filter records in a table based on specific conditions. It can be used with a variety of statements, such as SELECT, UPDATE, and DELETE, to limit the number of records affected by the statement.

Important Points

• The WHERE clause filters records based on a specific condition.
• It is used with SELECT, UPDATE, and DELETE statements.
• The WHERE clause is used to limit the number of records affected by a statement.

Summary

In summary, the WHERE clause in Oracle is used to filter records in a table based on a specific condition. It is used with the SELECT, UPDATE, and DELETE statements to limit the number of records affected by the statement. The WHERE clause is an important part of SQL and is used in various contexts to filter data based on specific conditions.