MySQL中使用SQL语句格式化日期
当在处理数据库数据的时候，会发现有些时间类型的数据格式需要调整，那么这个时候就需要用到MySQL自带的时间格式化函数DATE_FORMAT了。
下面贴出示例代码
# create_time = 2016-01-01 12:00:00, format to 2016-01-01 drop time part
select DATE_FORMAT(FROM_UNIXTIME(`create_time`), '%Y-%m-%d') AS 'date_formatted' from yiilib.comment;关于DATE_FORMAT第二个参数，可以参考如下列表
| Format | Description |
|---|---|
| %a | Abbreviated weekday name (Sun-Sat) |
| %b | Abbreviated month name (Jan-Dec) |
| %c | Month, numeric (0-12) |
| %D | Day of month with English suffix (0th, 1st, 2nd, 3rd, ) |
| %d | Day of month, numeric (00-31) |
| %e | Day of month, numeric (0-31) |
| %f | Microseconds (000000-999999) |
| %H | Hour (00-23) |
| %h | Hour (01-12) |
| %I | Hour (01-12) |
| %i | Minutes, numeric (00-59) |
| %j | Day of year (001-366) |
| %k | Hour (0-23) |
| %l | Hour (1-12) |
| %M | Month name (January-December) |
| %m | Month, numeric (00-12) |
| %p | AM or PM |
| %r | Time, 12-hour (hh:mm:ss followed by AM or PM) |
| %S | Seconds (00-59) |
| %s | Seconds (00-59) |
| %T | Time, 24-hour (hh:mm:ss) |
| %U | Week (00-53) where Sunday is the first day of week |
| %u | Week (00-53) where Monday is the first day of week |
| %V | Week (01-53) where Sunday is the first day of week, used with %X |
| %v | Week (01-53) where Monday is the first day of week, used with %x |
| %W | Weekday name (Sunday-Saturday) |
| %w | Day of the week (0=Sunday, 6=Saturday) |
| %X | Year for the week where Sunday is the first day of week, four digits, used with %V |
| %x | Year for the week where Monday is the first day of week, four digits, used with %v |
| %Y | Year, numeric, four digits |
| %y | Year, numeric, two digits |
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