In Oracle, the string concatenation operator is the "||" (two vertical bars) symbol. The operator is used to concatenate or join two or more strings together. For example, to concatenate the strings 'Hello' and 'World' together, you can use the following query:
SELECT 'Hello' || ' ' || 'World' FROM DUAL;
This will return the string 'Hello World'.
You can also use the concatenation operator to concatenate a string with a column value from a table like this:
SELECT 'Hello ' || first_name || ' ' || last_name FROM employees;
This will return a string that concatenates the string 'Hello ', the value of the first_name column, a space, and the value of the last_name column for each row in the employees table.
Alternatively, you can use the CONCAT function in Oracle to concatenate strings together:
SELECT CONCAT('Hello', ' ', 'World') FROM DUAL;
This will also return the string 'Hello World'.
Please note that the above examples are used with a SELECT statement, but you can also use the operator or function in other statements, such as INSERT, UPDATE, etc.
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