如何在Mysql中计算Count(*)的总和

Question

我有两个表,我计算它们的行数.例如;

Select count(*) FROM tbl_Events

Select count(*) FROM tbl_Events2

我需要总数.如何用单个语句对结果求和？

Answer 1

select sum(cnt) from (
    select count(*) as cnt from tbl_events
    union all
    select count(*) as cnt from tbl_events2
) as x