POSTGRESQL 创建表
POSTGRESQL 运算符
POSTGRESQL 选择数据
POSTGRESQL 函数
POSTGRESQL 加入表

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正确

练习:

选择所有国家字段为以下列表中的值之一的客户:

('挪威','瑞典','丹麦')

SELECT * FROM customers WHERE country IN ('Norway', 'Sweden', 'Denmark');
SELECT * FROM customers WHERE country IN ('Norway','Sweden','Denmark');
SELECT * FROM customers WHERE country IN ('Norway', 'Sweden','Denmark');
SELECT * FROM customers WHERE country IN ('Norway','Sweden', 'Denmark');

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SELECT * FROM customers
WHERE country ;







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