2 Where (price between 10 and 60) and (price not in (10,60));

NAME PRICE

------------------------- ----------

CD-RW Disk 20

CD-R Disk 15

Milk 1 lt. 20

SQL>

SQL> -- использование оператора IS NULL для обработки NULL значений

SQL> SELECT name, price, quantity FROM product WHERE quantity IS NULL;

NAME PRICE QUANTITY

------------------------- ---------- ----------

Blue Ink Marker 80

Milk 1 lt. 20

Milk 3 lt. 60

SQL> SELECT name, price, quantity FROM product WHERE NOT (quantity IS NULL);

NAME PRICE QUANTITY

------------------------- ---------- ----------

CD-RW Disk 20 100

CD-R Disk 15 200

3.5" Floppy Disk 10 30

DVD-R Disk 80 10

DVD+R Disk 80 10

DVD-RW Disk 300 5

DVD+RW Disk 300 5

Red Ink Marker 60 10

Green Ink Marker 60 10

Blue Ink Marker 60 10

Milk 3 lt. 65 5

11 Rows selected.

SQL> SELECT name FROM product WHERE quantity IS NULL;

NAME

-------------------------

Blue Ink Marker

Milk 1 lt.

Milk 3 lt.

SQL> SELECT name FROM product WHERE quantity IS NOT NULL;

NAME

-------------------------

CD-RW Disk

CD-R Disk