求一条SQL合并语句,该如何解决

2012-03-09

求一条SQL合并语句select*from tablewhere A Bselect*from tablewhere 11将上面两条SQL语句合成一条

求一条SQL合并语句
select * from table where A ='B';
select * from table where 1=1;
将上面两条SQL语句合成一条，当B有值是A='B'条件有用，当B没有值是条件不起作用。

[解决办法]

SQL code

SELECT column1, column2  FROM table t WHERE t.TIME BETWEEN NVL (TO_DATE (parameter1, 'yyyy-mm-dd hh24:mi:ss'),                           t.TIME                          )                  AND NVL (TO_DATE (parameter2, 'yyyy-mm-dd hh24:mi:ss'),                           t.TIME                          )