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PostgreSQL ORDER BY


排序数据

ORDER BY 关键字用于按升序或降序对结果进行排序。

ORDER BY 关键字默认按升序对记录进行排序。要按降序对记录进行排序,请使用 DESC 关键字。

示例

按价格对表进行排序

SELECT * FROM products
ORDER BY price;
运行示例 »

DESC

ORDER BY 关键字默认按升序对记录进行排序。要按降序对记录进行排序,请使用 DESC 关键字。

示例

按价格降序对表进行排序

SELECT * FROM products
ORDER BY price DESC;
运行示例 »

按字母顺序排序

对于字符串值,ORDER BY 关键字将按字母顺序排序

示例

按产品名称对表进行排序

SELECT * FROM products
ORDER BY product_name;
运行示例 »

按字母顺序降序

要反向按字母顺序对表进行排序,请使用 DESC 关键字

示例

按产品名称降序对表进行排序

SELECT * FROM products
ORDER BY product_name DESC;
运行示例 »

PostgreSQL 练习

通过练习测试自己

练习

编写正确的 SQL 语句,按客户名称的字母顺序对结果进行排序

SELECT * FROM customers
;
        

开始练习


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