MYSQL - 找到了10种“2020年6月”的表达
LEFT()函数参见:https://www.begtut.com/sql/func-mysql-left.html
REGEXP语法参见:
https://www.cnblogs.com/timssd/p/5882742.html
https://www.cnblogs.com/zhaopanpan/p/10133224.html
DATE_FORMAT()函数参见:https://www.w3school.com.cn/sql/func_date_format.asp
EXTRACT()函数参见:https://www.runoob.com/sql/func-extract.html
DATEDIFF()函数参见:https://www.runoob.com/sql/func-datediff-mysql.html
YEAR()函数参见:https://blog.csdn.net/moakun/article/details/82528829
MONTH()函数参见:https://www.yiibai.com/mysql/month.html


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