Oracle??????????COUNT??????

?Oracle?????????COUNT?????????????????????????COUNT?????????????

COUNT????????????????????????????????????????????????COUNT??????????????????????????????

???COUNT???????????

1. ???????

???????COUNT????????????????????????????????????????????????????

2. COUNT???????

COUNT??????????????????????????????????????????????????????

3. COUNT?????????

???COUNT?????????????????

3.1 ?????rownum???

?????????????????????????????????????

SELECT COUNT(*) FROM equipment e, sal_controledpnsnrange sc

WHERE sc.new_min_item_no <= e.itemnum AND sc.new_max_item_no >= e.itemnum AND sc.new_min_serial_no <= e.serialnum AND sc.new_max_serial_no >= e.serialnum AND e.itemnum = a_item_no ORDER BY rownum

3.2 ??LEADING?USE_NL??

LEADING?USE_NL????????COUNT????????????????LEADING(e)?USE_NL(sc)???????????????

SELECT COUNT(sc.pmnum) FROM equipment e, sal_controledpnsnrange sc

WHERE sc.new_min_item_no <= e.itemnum AND sc.new_max_item_no >= e.itemnum AND sc.new_min_serial_no <= e.serialnum AND sc.new_max_serial_no >= e.serialnum AND e.itemnum = a_item_no ORDER BY rownum

3.3 ??????

???????????????????????????????????????????????????

4. ?????????

???COUNT???????????????????

4.1 ?????

4.2 ???????

4.3 ????????

5. ?????

????????????????????????????????????????????????

?????????????COUNT??????????Oracle???????????

????????Oracle???????????????????????????????