判断题
松键连接包括平键连接、半圆键连接和花键联接。
【参考答案】
正确
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佛教未来世佛、现在世佛、过去世佛依次为( )。 A. 释迦牟尼佛、弥勒佛、燃灯佛 B. 弥勒佛、燃灯佛、释迦牟尼佛 C. 弥勒佛、释迦牟尼佛、燃灯佛 D. 燃灯佛、弥勒佛、释迦牟尼佛
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The CUSTOMERS table has these columns:CUSTOMER_ID NUMBER(4) NOT NULLCUSTOMER_NAME VARCHAR2(100) NOT NULLSTREET_ADDRESS VARCHAR2(150)CITY_ADDRESS VARCHAR2(50)STATE_ADDRESS VARCHAR2(50)PROVINCE_ADDRESS VARCHAR2(50)COUNTRY_ADDRESS VARCHAR2(50)POSTAL_CODE VARCHAR2(12)CUSTOMER_PHONE VARCHAR2(20)The CUSTOMER_ID column is the primary key for the tablE.You need to determine how dispersed your customer base is. Which expression finds the number of different countries represented in the CUSTOMERS table?()A.COUNT(UPPER(country_address))B.COUNT(DIFF(UPPER(country_address)))C.COUNT(UNIQUE(UPPER(country_address)))D.COUNT DISTINCT UPPER(country_address)E.COUNT(DISTINCT (UPPER(country_address)))
A.You
B.COUNT(UPPER(country_address))
C.COUNT(DIFF(UPPER(country_address)))
D.COUNT(UNIQUE(UPPER(country_address)))
E.COUNT
F.COUNT(DISTINCT
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