在Mysql中添加两个不同查询的结果

我在写查询时遇到困难。我一直在与UNION合作处理两个问题，它们都很好。当我尝试添加两个查询的结果时，我的问题出现了

以下是我自己的一些解释

//Query 1
select count(id) from table1   <-- This gives a result of 2 
//Query 2
select count(id) from table2   <-- This gives a result of 1


//What I want to do is to add the two queries (2 + 1 = 3):
(select count(id) from table1) + (select count(id) from table2) <-- Which gives a result of 3.

我想我不应该用“+”号。有没有办法做到这一点？

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多谢各位

您应该对整个查询进行选择：

SELECT (SELECT COUNT(id) FROM table1) + (SELECT COUNT(id) FROM table2) AS count

试一试

SELECT (SELECT COUNT(id) FROM table1) + (SELECT COUNT(id) FROM table2) AS count

SELECT (select count(id) from table1) + (select count(id) from table2) from dual;