ORACLE TO_CHAR

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TO_CHAR日期格式：
YYYY:数字表示完整年份；
YEAR:用字母拼写年份；
MM:两位数值月份；
MONTH:月份全名；
MON:月份三个字母缩写；
DY:星期几的三个字母缩写；
DAY:星期几全名；
DD:数字表示月份中某日
TO_CHAR数字格式：
9：代表一个数字，个数代表位数；
0：强制显示0，用于前导；
$：放置美元符号；
L：使用当地货币符号；
.：显示小数点；
,：显示千位指示符；

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