SQL语句，多条件语句合为一条语句

Question

SELECT * from event where create_Date >= #{startDate} and create_Date <= #{endDate} and name = #{name}；
SELECT * from event where create_Date >= #{startDate} and create_Date <= #{endDate} ；
SELECT * from event where name = #{name}；
这3个sql语句怎么合为一条sql语句，且能满足3个各自的条件

Answer 1

SELECT *
from event
where create_Date >= #{startDate}
and create_Date <= #{endDate}
and name = #{name}
union
SELECT *
from event
where create_Date >= #{startDate}
and create_Date <= #{endDate}
union
SELECT * from event where name = #{name};
union可以去掉重复的数据