當前日期為第几周

SQL:

select to_char(TO_DATE('20110101', 'YYYYMMDD'), 'yyyyiw') as week, --oracle求当年的第几周

      to_char(TO_DATE('20110101', 'YYYYMMDD'), 'yyyyww') as week2, --oracle求当年的第几周

      to_char(TO_DATE('20110101', 'YYYYMMDD'), 'yyyy') as year, --oracle求第几年

      to_char(TO_DATE('20110101', 'YYYYMMDD'), 'yyyymm') as month, --oracle求当年的第几月

      to_char(TO_DATE('20110101', 'YYYYMMDD'), 'yyyyddd') as day, --oracle求当年的第几天

      to_char(TO_DATE('20110401', 'YYYYMMDD'), 'yyyyq') as quarter -- oracle求当年的第几季度

from dual

DELPHI weekoftheyear