pl/sql如果查询上月记录
如题
------解决方案--------------------select to_char(trunc(sysdate,  'MM ') - 1,  'YYYY-MM-dd ') ||  ' 23:59:59 ' as firstdt from dual 
 select to_char(trunc(sysdate,  'MM ') - 1,  'YYYY-MM ') ||  '-01 00:00:00 ' as lastdt from dual
------解决方案--------------------啊,写反了 
 select to_char(trunc(sysdate,  'MM ') - 1,  'YYYY-MM-dd ') ||  ' 23:59:59 ' as lastdt from dual 
 select to_char(trunc(sysdate,  'MM ') - 1,  'YYYY-MM ') ||  '-01 00:00:00 ' as firstdt from dual