FUNCTION isdate (datestr VARCHAR2, format VARCHAR2) RETURN number IS p_date DATE; BEGIN SELECT TO_DATE (datestr, format) INTO p_date FROM DUAL; ; EXCEPTION WHEN OTHERS THEN ; END; 多条件模糊查询时: function get_date_str ( p_date varchar2) return varchar2 is
今天的所有数据:select * from 表名 where DateDiff(dd,datetime类型字段,getdate())=0昨天的所有数据:select * from 表名 where DateDiff(dd,datetime类型字段,getdate())=17天内的所有数据:select * from 表名 where DateDiff(dd,datetime类型字段,getdate())<=730天内的所有数据:select * from 表名 where DateDiff(dd