摘要:
123:33:142013-03-09select count(1) from eurusd t ;delete from eurusd t where to_date(t.dates,'yyyy.MM.dd')>to_date('2011.12.31','yyyy.MM.select t.dates,to_date(t.dates,'yyyy.MM.dd') from eurusd t ;select count(1) from eurusd t where to_date(t.dates,'yyyy.MM.dd' 阅读全文
摘要:
create unique index idx_eurusd_dates on eurusd(dates desc); 阅读全文