问题
问答题 简答题
计算题：有一双头右螺旋螺纹，导程S为5mm，求螺距P？
答案
参考答案：
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计算题：有一双头右螺旋螺纹，导程S为5mm，求螺距P？
参考答案：
以下是INVENTORY(库存)表中每一列的详细定义：
| Column Name | ID_HUMBER | DESCRIPTION | MANUFACTURER_ID | QUANTITY | PRICE | ORDER_DATE |
| Key Type | PK | FK | ||||
| Nulls/Unique | HN, U | NN | NN | |||
| FK Table | MANUFACTURER | |||||
| FK Column | ID_NUMBER | |||||
| Datatype | NUM | VARCHAR2 | VARCHAR2 | NUM | HUM | DATE |
| Length | 9 | 25 | 26 | 9 | 8, 2 |
A．DELETE FROM
inventory
WHERE
order_date＞’25-JUL-1997’
AND
id_number=&id_number;
B．DROP FROM
inventory
WHERE
order_date＞TO_DATE(’25-JUL-97’)
AND
id_number=&id_number;
C．DELETE FROM
inventory
WHERE
order_date=＞’25-JUL-97’
AND
id_number=’&id_number’;
D．DELETE FROM
inventory
WHERE
order_date＞(’25-JUL-1997’)
OR
id_number=&id_number;
E．DELETE FROM
inventory
WHERE
order_date＞TO_DATE(’July 25, 1997’, ’DD.MM.YYYY’)
AND
id_number=&id_number;