Question

我要做的是显示有关来自亚洲和欧洲的国家的所有信息，而不是其他大洲。然后按大陆订购。我只是遗漏了一些明显的东西，但它是什么？

如果我把AND放在亚洲和欧洲之间，那么它会尝试显示来自亚洲和欧洲的国家，所以这样做是不行的，但如果我放OR，那么它只会显示亚洲。

我的代码是什么样的;

SELECT * 
FROM country
WHERE Continent = 'Asia' AND 'Europe'
ORDER BY Continent DESC;

Answer 1

尝试以下

SELECT * FROM country
WHERE Continent in ('Asia','Europe')
ORDER BY Continent DESC;

Answer 2

试

SELECT * FROM country
WHERE Continent IN ('Asia','Europe')
ORDER BY Continent DESC;

OR

SELECT * FROM country
WHERE Continent ='Asia' OR Continent= 'Europe'
ORDER BY Continent DESC;

Answer 3

SELECT * FROM country
WHERE Continent = 'Asia' OR Continent = 'Europe'
ORDER BY Continent DESC;

Answer 4

试试这个

SELECT * FROM country
WHERE Continent In( 'Asia' , 'Europe')
ORDER BY Continent DESC;

（OR）

SELECT * FROM country
WHERE Continent ='Asia' OR Continent= 'Europe'
ORDER BY Continent DESC;

（OR）

SELECT * FROM country
WHERE Continent ='Asia'
ORDER BY Continent DESC;
UNION ALL
SELECT * FROM country
WHERE Continent ='Europe'
ORDER BY Continent DESC;

Answer 5

SELECT *
FROM country
WHERE Continent = "Africa" OR Continent = "Australia"
ORDER BY Continent DESC;

如果你想要非洲人和澳大利亚人，那就

SELECT *
FROM country
WHERE !(Continent = "Africa" AND Continent = "Australia") 
ORDER BY Continent DESC;

SQL显示多个列

5 个答案: