SQL Calculate week number from a date column [duplicate] - sql

This question already has answers here:
How to extract week number in sql
(4 answers)
Closed 9 years ago.
I have the following database schema
Facts(ReportNo, ReportName, Load_Date)
Load_Date is a column of (number type) and has
records of date in YYYYMMDD Format.
I need to print the week number for each row using the already existing dates
in Load_Date. Since it is already of type number, I do not have to convert it from date to char.
Output should be
**Week Number | ReportNo | ReportName

try
select ReportNo,ReportName,to_char(to_date(Load_Date,'yyyymmdd'),'ww') from Facts

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I want to get an ORACLE statement which returns rows that are older than 30 days from the the date of creation.
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i am using sql
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