開頭 and title with div asc asi trie ont

SELECT from world篇

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11.

題目:

The CASE statement shown is used to substitute North America forCaribbean in the third column.

Show the name - but substitute Australasia for Oceania - for countries beginning with N. （翻譯：讓你給出名字和所屬大洲的名字， 其中所屬大洲的名字是Oceania的改成Australasia, 條件是國名的第一個字符是N） 答案： SELECT name, CASE WHEN continent=‘Oceania‘ THEN ‘Australasia‘ ELSE continent END FROM world WHERE name LIKE ‘N%‘; 解答： CASE有點想IF THEN語句。

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12. 題目： Show the name and the continent - but substitute Eurasia for Europe and Asia; substitute America - for each country in North America or South America or Caribbean. Show countries beginning with A or B （翻譯：顯示name,continent 要求當continent為Asia和Europe時，修改continent為Eurasia。 當continent為North America或South America或Caribbean時，修改為America. 條件是name以A或B開頭） 答案：

SELECT name,
CASE WHEN continent IN (‘Asia‘,‘Europe‘) THEN ‘Eurasia‘
WHEN continent IN (‘North America‘,‘South America‘,‘Caribbean‘) THEN ‘America‘
ELSE continent END
FROM world
WHERE name LIKE ‘A%‘ OR name LIKE ‘B%‘

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答案：

SELECT name,continent,
CASE WHEN continent IN (‘Eurasia‘, ‘Turkey‘)
THEN ‘Europe/Asia‘

WHEN continent = ‘Oceania‘
THEN ‘Australasia‘

WHEN continent = ‘Caribbean‘
THEN
CASE
WHEN name LIKE ‘B%‘
THEN ‘North America‘
ELSE ‘South America‘
END
ELSE continent
END
FROM world
ORDER BY name ASC;

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