标签：code count color font from ble union 多个 sql
方法一：
select t1.num1,t2.num2,t3.num3 from (select count(*) num1 from table1) t1, (select count(*) num2 from table2) t2, (select count(*) num3 from table3) t3
方法二：
select sum(t.num1),sum(t.num2),sum(t.num3) from ( select count(*) num1,0 as num2,0 as num3 from table1 union select 0 as num1,count(*) num2,0 as num3 from table2 union select 0 as num1,0 as num2,count(*) num3 from table3 ) t
标签：code count color font from ble union 多个 sql
原文地址：http://www.cnblogs.com/xbq8080/p/7344212.html
