|| usage in oracle

The || operator in Oracle is a logical OR operator used to connect Boolean expressions or strings. It returns: Boolean: true if at least one expression is true, false otherwise. String: Concatenates two strings.

The || operator in Oracle

The || operator in Oracle is a logical OR operator, used Used to concatenate two Boolean expressions or strings. It returns a boolean or string, depending on the operands of the operator.

Boolean expressions

When the || operator is used with a Boolean expression, it returns true if at least one expression is true, otherwise it returns false. For example:

SELECT * FROM employees WHERE salary > 10000 OR department = 'Sales';

This query will return all employees who meet one of the following conditions:

• Salary is greater than 10000
• The department is "Sales"

String

When the || operator is used on strings, it concatenates two strings. For example:

SELECT first_name || ' ' || last_name FROM employees;

This query will return the complete names of all employees, including space delimiters.

Usage Notes

• When connecting Boolean expressions, you can use the || operator.
• When concatenating strings, you can use the || operator. The
• || operator has lower precedence than the AND operator.
• The two operands of the operator must have the same data type.

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