How to get the week start date from ISO week number

Hi,
I have a table with the following stucture
Year    error    Week1     week2   week3 ......week53
2012       error1     2           4         2             1
2012       error2    3          0        1                 1I was hoping to get something like select year, error, week1||'Week start date which is a monday of that week' , week2||'Week start date,again monday',....week53 from table
Any suggestions please?
Thanks,
Sun

Hi, Sun,
To see when week N started, add 7 * (N - 1) days to the beginning of the year. (By definition, the beginning of the ISO year is the start of week 1 of the ISO year.)
To see when week 22 of the current year started:
SELECT TRUNC (SYSDATE, 'IYYY') + (7 * (22 - 1))
FROM dual
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say what version of Oracle you're using.
See the forum FAQ {message:id=9360002}

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