MySQL到PostgreSQL：如何修改此SQL查询？

我有一个MySQL查询，它使用了

MONTH（）

和

YEAR（）

：

如何修改该查询以使用PostgreSQL？

这种语法应该适用于PostgreSQL、Oracle和Teradata

SELECT extract(MONTH from created_at) AS month, extract(YEAR from created_at) AS year FROM users GROUP BY extract(MONTH from created_at), extract(YEAR from created_at) ORDER BY extract(MONTH from created_at), extract(YEAR from created_at) 挑选 将（创建时的月份）提取为月份， 提取（创建时的年份）为年份 来自用户 按摘录分组（创建时起的月份），摘录（创建时起的年份） 按提取顺序（创建时起的月份），提取顺序（创建时起的年份） 这是最新的手册

顺便说一句：这是标准（ANSI）SQL，也可以在MySQL上运行

SELECT 
  EXTRACT(MONTH FROM created_at) AS month, 
  EXTRACT(YEAR FROM created_at) AS year 
FROM users 
GROUP BY EXTRACT(MONTH FROM created_at), EXTRACT(YEAR FROM created_at)
ORDER BY EXTRACT(YEAR FROM created_at), EXTRACT(MONTH FROM created_at)

SELECT extract(MONTH from created_at) AS month, extract(YEAR from created_at) AS year FROM users GROUP BY extract(MONTH from created_at), extract(YEAR from created_at) ORDER BY extract(MONTH from created_at), extract(YEAR from created_at)