选择*从(materialized_v1全部合并materialized_v2);
您需要先输入select
,然后再输入union
。关于物化视图,这里没有具体说明:
select * from materialized_v1
union all
select * from materialized_v2;
为了使这两个视图都具有相同的列数和相同的数据类型。最好枚举select
子句中的列,这使您有机会根据需要调整列和数据类型:
select col1, col2, col3 from materialized_v1
union all
select col4, col4, col5 from materialized_v2;