CREATE TABLE EMPLOYEES 
   (	EMPLOYEE_ID NUMBER(6,0), 
	FIRST_NAME VARCHAR2(20 BYTE), 
	LAST_NAME VARCHAR2(25 BYTE),
	EMAIL VARCHAR2(25 BYTE),
	PHONE_NUMBER VARCHAR2(20 BYTE), 
	HIRE_DATE DATE,
	JOB_ID VARCHAR2(10 BYTE),
	SALARY NUMBER(8,2), 
	COMMISSION_PCT NUMBER(2,2), 
	MANAGER_ID NUMBER(6,0), 
	DEPARTMENT_ID NUMBER(4,0));
	

INSERT INTO employees(
	EMPLOYEE_ID, 
	FIRST_NAME,
	LAST_NAME,
	EMAIL,
	PHONE_NUMBER,
	HIRE_DATE,
	JOB_ID,          
	SALARY,         
	COMMISSION_PCT,              
	MANAGER_ID,       
	DEPARTMENT_ID )
      
VALUES (
        175,
        'Alyssa',
        'Hutton'
        'AHUTTON'
        '011.44.1644.429266',
         NULL
        'SA_REP',
         8800
         0.25,
        149,
        NULL)
COMMIT;

     --Using an implicit SELECT INTO to populate a single row of data in a collection:
SET SERVEROUTPUT ON
SET ECHO ON

DECLARE
	TYPE emp_copy_t IS TABLE OF employees%ROWTYPE;
	l_emps  emp_copy_t;

BEGIN
	l_emps:=emp_copy_t();
	l_emps.EXTEND;
	
	SELECT * INTO l_emps(1)
	FROM   	 employees
	WHERE  	 employee_id = 175;
	
	--DBMS_OUTPUPT.put_line('Employee details are'||' '|| l_emps(1));
	--DBMS_OUTPUPT.put_line('Employee details are'||' '|| l_emps);
	 --DBMS_OUTPUPT.put_line('Employee details are'||' '|| l_emps(l_emps(1));
	 --DBMS_OUTPUPT.put_line('Employee details are'||' '|| l_emps(l_emps());
END;
/

Error report -
ORA-06550: line 13, column 24:
PLS-00306: wrong number or types of arguments in call to '||'
ORA-06550: line 13, column 2:
PL/SQL: Statement ignored
06550. 00000 -  "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:

DBMS_OUTPUPT.put_line('Employee details are'||' '|| l_emps(1).first_name || ' ' ||  l_emps(1).last_name || ' ' ||  l_emps(1).salary);