Sql 如何查询Datetime多次在何处？

我想要很多次。 但我试着质疑，这是行不通的

示例

表cus_账单

Number       Period
A-20160101   01/2015
A-20160410   04/2015
A-20160912   09/2015
A-20161020   10/2015
A-20161102   11/2015
A-20161219   12/2015

SQL

SELECT v.*
FROM cus_bill v
WHERE TO_DATE('01/'||V.PERIOD,'DD/MM/YYYY') >= TO_DATE('01/'|| '10/2015','DD/MM/YYYY') 
and TO_DATE('01/'||V.PERIOD,'DD/MM/YYYY') <= TO_DATE('01/'|| '12/2015','DD/MM/YYYY')
and V.PERIOD IN ('01/2015','09/2015')  

---

很难说你想要什么。你能用一句话告诉我们选择的标准是什么吗？日期怎么可能在10月和12月之间，而在1月呢？

Number       Period
A-20160101   01/2015
A-20160912   09/2015
A-20161020   10/2015
A-20161102   11/2015
A-20161219   12/2015

WHERE TO_DATE('01/'||V.PERIOD,'DD/MM/YYYY') >= TO_DATE('01/'|| '10/2015','DD/MM/YYYY') 
and TO_DATE('01/'||V.PERIOD,'DD/MM/YYYY') <= TO_DATE('01/'|| '12/2015','DD/MM/YYYY')
and V.PERIOD IN ('01/2015','09/2015')  

WHERE   TO_DATE('01/'|| V.PERIOD,'DD/MM/YYYY') 
BETWEEN TO_DATE('01/'|| '10/2015','DD/MM/YYYY') 
AND     TO_DATE('01/'|| '12/2015','DD/MM/YYYY') 
OR      V.PERIOD IN  ('01/2015','09/2015')