mysql - 选择开始年份和开始月份到结束年份和结束月份之间的行？

Question

我正在尝试为给定的年份和月份范围选择行。 (即:从 <start year>+<start month> 到 <end year>+<end month> ) 我尝试了以下查询，但得到了意外的行。我错过了什么吗？

SELECT * FROM table AS t
WHERE 
((YEAR(t.column1)='<start year>' AND MONTH(t.column1)>='<start month>') OR
(YEAR(t.column1)>'<start year>' AND YEAR(t.column1)<'<end year>') OR
(YEAR(t.column1)='<end year>' AND MONTH(t.column1)<='<end month>'))

Answer 1

只有开始年份和结束年份不同时，您的查询才能正常工作。如果它们相同，则查询返回当年的所有行。您需要单独处理这种情况:

(
    start_year != end_year and 
    (
        (YEAR(t.column1)='<start year>' AND MONTH(t.column1)>='<start month>') OR  
        (YEAR(t.column1)>'<start year>' AND YEAR(t.column1)<'<end year>') OR  
        (YEAR(t.column1)='<end year>' AND MONTH(t.column1)<='<end month>')
    )
)
OR (start_year = end_year and MONTH(t.column1) >= start_month
                          and MONTH(t.column1) <= end_month)

但是，这可以大大简化:

YEAR(t.column1) * 12 + MONTH(t.column1) >= start_year * 12 + start_month
and YEAR(t.column1) * 12 + MONTH(t.column1) <= end_year * 12 + end_month

或者更短的 between:

YEAR(t.column1) * 12 + MONTH(t.column1)
BETWEEN start_year * 12 + start_month and end_year * 12 + end_month