軟件測試開發語言oracle 取周

       軟件測試開發語言oracle 取周 oracle 數據庫

　　select to_char(to_date('20090108','YYMMDD'),'IW') from dual ;

　　select to_char(to_date('20090108','YYMMDD'),'WW') from dual ;

　　select to_char(to_date('20090107','YYMMDD'),'IW') from dual ;

　　select to_char(to_date('20090107','YYMMDD'),'WW') from dual ;

　　IW：Week of year (1-52 or 1-53) based on the ISO standard.

　　WW：Week of year (1-53) where week 1 starts on the first day of the year and continues to the seventh day of the year.

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