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Developer-C 11.1
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CREATE TABLE customers ( id INTEGER PRIMARY KEY, name VARCHAR2(20) );
CREATE TABLE s_order_t ( order_id INTEGER PRIMARY KEY, customer_id REFERENCES customers );
INSERT INTO customers VALUES (1, 'Alice');
1 rows affected
INSERT INTO s_order_t VALUES (1010, 1);
1 rows affected
CREATE OR REPLACE FUNCTION get_customer_name( cust_id IN S_ORDER_T.ORDER_ID%TYPE ) RETURN CUSTOMERS.NAME%TYPE IS cname CUSTOMERS.NAME%TYPE; BEGIN SELECT name INTO cname FROM s_order_t o INNER JOIN customers c ON (o.customer_id = c.id) WHERE o.order_id = cust_id; RETURN cname; EXCEPTION WHEN no_data_found THEN RETURN NULL; END; /
DECLARE cname CUSTOMERS.NAME%TYPE; BEGIN cname := get_customer_name (1010); DBMS_OUTPUT.PUT_LINE (cname); END; /
1 rows affected dbms_output: Alice