如何将sql查询舍入到较低的整数

Question

例如我有一个查询：

select (select size from acc where acc_id = 1)/(select count(m_id) from m_acc  JOIN dns ON dns.dns_id = m_acc.dns_id where acc_id = 1)*1000000;

查询结果：

3333333333.3330

我想要

3333333333

我不需要舍入到大写整数。我想要舍入到更低的整数。我试过这样做：

select floor (select size from acc where acc_id = 1)/(select count(m_id) from m_acc  JOIN dns ON dns.dns_id = m_acc.dns_id where acc_id = 1)*1000000;

但结果我得到了这个：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'size from acc where acc_id = 1)/(select coun' at line 1

请告诉我，我有错误？

Answer 1

使用FLOOR()。试试这个：

select FLOOR
(
    (select size from acc where acc_id = 1)
    /
    (select count(m_id) from m_acc  JOIN dns ON dns.dns_id = m_acc.dns_id where acc_id = 1)
    *
    1000000
);