What does (+ mean in oracle

The " " symbol in Oracle represents the connection operator, which is used to: connect strings to form a new string; perform numerical addition operations; connect other data types (such as dates or binary data).

The meaning of the " " symbol in Oracle

The " " symbol in Oracle indicatesConnectionoperator, mainly used to connect strings or numbers.

String concatenation

When used to concatenate strings, the " " symbol concatenates two or more strings into a new string. For example:

SELECT 'Hello' || 'World';

Output:

HelloWorld

Number concatenation

When used to concatenate numbers, the " " symbol performs mathematical addition. For example:

SELECT 1 + 2;

Output:

3

Other notes

• The " " symbol can also be used to join other data types, such as dates or binary data.
• The " " symbol has higher precedence than other mathematical operators, such as multiplication and division.
• Using spaces before the " " symbol can improve readability, especially when dealing with complex expressions. For example:

SELECT 'Hello' || ' ' || 'World';

Example

Here are some practical examples of using the " " operator:

• Concatenate two names Field to create the full name:

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

• Apply the 10% discount to the product price:

SELECT price * (1 - 0.10) AS discounted_price FROM products;

• Remove the leading or suffix from the string Space:

SELECT TRIM(' Hello World ') FROM dual;

Output:

Hello World

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