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日期类型的操作

year()

取一个date数据类型的年份

sql
where year(date) = 1997

between

sql
purchase_date between Prices.start_date and Prices.end_date

left/right

选择一个date数据“2020-19-12”的左七位数字作为month的标记。

sql
left(trans_date, 7) as month

datediff

计算两个时间之差（前者减后者）

sql
join XXX on datediff(a.visited_on, b.visited_on) between 0 and 6