String -Verkettung in PostgreSQL
-- with functions
CONCAT(first_name,' ', last_name) AS full_name;
-- with string concatenation operator
SELECT first_name || ' ' || last_name AS full_name FROM customer;
-- String concatenation with a non-string input
SELECT customer_id || ': ' || first_name || ' ' || last_name AS full_name
FROM customer;
Lux