oracle sql日期比较 .
在某某日期之前：
select * from tableName where dateColm <= to_date('2012-06-14','yyyy-mm-dd');select * from tableName where dateColm <= to_date('2012-06-14 00:00','yyyy-mm-dd hh24:mi');select * from tableName where dateColm <= to_date('2012-06-14 00:00:00','yyyy-mm-dd hh24:mi:ss');?在某某日期之后：
select * from tableName where dateColm >= to_date('2012-06-14','yyyy-mm-dd');?
等于某个日期（可精确到时分秒）：
select * from tableName where dateColm = to_date('2012-06-14','yyyy-mm-dd');select * from tableName where dateColm = to_date('2012-06-14 00:00','yyyy-mm-dd hh24:mi');select * from tableName where dateColm = to_date('2012-06-14 00:00:00','yyyy-mm-dd hh24:mi:ss');?在某个时间段范围内：
<pre name="code">select * from tableName where dateColm between to_date('2012-06-14 00:00:00','yyyy-mm-dd hh24:mi:ss') and to_date('2012-06-24 00:00:00','yyyy-mm-dd hh24:mi:ss');select * from tableName where dateColm >= to_date('2012-06-14 00:00:00','yyyy-mm-dd hh24:mi:ss') and dateColm <= to_date('2012-06-24 00:00:00','yyyy-mm-dd hh24:mi:ss');?