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:
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;