Question

我需要通过“视图”加入2个表来获取每个人（IdData），他拥有多少账户以及已经存入多少存款。我想要获取的列是：IdData，NUmberOfAccounts，NumberOfDeposits

账户：

ACCOUNTNUMBER
DateAccount
值
IDDATA

存款：

DepositNumber
DateDeposit
ValueDeposit
AccountNumber（外键）

我不确切知道如何加入这些信息。单独看起来像这样。我需要以某种方式加入他们。

select count(Accounts.AccountNUmber) as NUmberOfAccounts,IdData
from Accounts
group by IdData

select count(Deposits.AccountNUmber) as NumberOfDeposits,IdData
from Deposits inner join Accounts on Deposits.AccountNUmber=Accounts.AccountNUmber
group by IdData

Answer 1

您可以尝试此查询：

选择a.idData，将（a.accountNumber）计为NumberOfAccounts，（从存款中选择计数（depositNumber）其中accountNumber = a.idData）为NumberOfDeposits 从帐户a 按IDData分组

这是fiddle

Answer 2

只需使用这样的子查询：

SELECT a.idData,
count(a.AccountNumber) AS NumberOfAccounts,
(
     SELECT count(depositNumber) FROM deposits as b 
     WHERE b.accountNumber = a.accountNumber
) 
AS NumberOfDeposits
FROM accounts a
GROUP BY iddata;

以下是Fiddle

sql内连接视图表

2 个答案: