MYSQL 总计数超过 1 table 总结果

Question

我有 3 张桌子。我想在 1 个结果中 select count，例如：

table1=1000 records + table2=400 records + table3=200 records = 1600

1600 是我想要从服务器返回的一个结果。

也许是 MySQL 内部连接？有什么建议吗？

Answer 1

试试这个：

SELECT ((SELECT COUNT(*) FROM tbl1 ) + (SELECT COUNT(*) FROM tbl2 ) + (SELECT COUNT(*) FROM tbl3 )) AS TotalRecords

Answer 2

select 
  (
    select count(columnname) from table1 

  ) + (
    select count(columnname) from table2

  )+ (
    select count(columnname) from table3

  )

Answer 3

    select 
    ((select count(*) from table1) + (select count(*) from table2) + (select count(*) from table3))
 as totalCount;

Answer 4

试试这个：

select sum(c) from (
  select count(*) as c from table1 
  union 
  select count(*) as c from table2 
  union 
  select count(*) as c from table3 
) tmp

这会给你总数。

Answer 5

试试这个...，

SELECT  (SELECT COUNT(*) FROM tbl1
        )+
        (SELECT COUNT(*)  FROM tbl2
        )+
        ( SELECT COUNT(*) FROM tbl3
        )   as 'AllCount'

Answer 6

谢谢大家的回复我有 3 个表，我想 select 计算 1 个结果

我仍然得到这样的结果

count1 count2 count3 1235 134 234

这不是我想要的一共结果

MYSQL 总计数超过 1 table 总结果

MYSQL total count more than 1 table total result

mysql