This will fail, because the datatypes of the two arguments are different : NVL « Char Functions « Oracle PL / SQL

1. Oracle PL / SQL
2. Char Functions
3. NVL

This will fail, because the datatypes of the two arguments are different

  
SQL>
SQL> CREATE TABLE product (
  2       product_name     VARCHAR2(25),
  3       product_price    NUMBER(4,2),
  4       quantity_on_hand NUMBER(5,0),
  5       last_stock_date  DATE);

Table created.

SQL>
SQL> INSERT INTO product VALUES ('Small Widget', 99, 1, '15-JAN-03');

1 row created.

SQL> INSERT INTO product VALUES ('Medium Widget', 75, 1000, '15-JAN-02');

1 row created.

SQL> INSERT INTO product VALUES ('Product Number', 50, 100, '15-JAN-03');

1 row created.

SQL> INSERT INTO product VALUES ('Round Church Station', 25, 10000, null);

1 row created.

SQL>
SQL> SELECT product_name,
  2         NVL(last_stock_date, 'N/A') "Last Stocked"
  3  FROM   product;
       NVL(last_stock_date, 'N/A') "Last Stocked"
                            *
ERROR at line 2:
ORA-01858: a non-numeric character was found where a numeric was expected


SQL>
SQL> DROP TABLE product;

Table dropped.

SQL>

   
  

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