sql - 2 つのフィールドによる SQL グループ

Question

私は2つのテーブルを持っていCustomersますCustomerStatusEntries:

CustomerStatusEntries
---------------------------
Id | Branch | CustomerStatus_Value | Customer_Id

CustomerStatus_Value  = ("B" = "Block" , "E" = "Created" etc...)

この出力を取得する必要があります

Answer 1

SELECT Branch AS 'Branch Code',
    SUM(CASE WHEN CustomerStatus_Value = 'E' THEN 1 ELSE 0 END) AS 'Created',
    SUM(CASE WHEN CustomerStatus_Value = 'A' THEN 1 ELSE 0 END) AS 'Active',
    SUM(CASE WHEN CustomerStatus_Value = 'B' THEN 1 ELSE 0 END) AS 'Blocked',
    SUM(CASE WHEN CustomerStatus_Value = 'C' THEN 1 ELSE 0 END) AS 'Cancelled',
    COUNT(CustomerStatus_Value) AS 'All'
FROM CustomerStatusEntries
GROUP BY Id

Answer 2

サンプルに表示した固定数の列を想定すると、次のようにすることができます。

SELECT Branch, 
       SUM(CASE WHEN CustomerStatus_Value = 'E' THEN 1 ELSE 0 END) AS Created,
       SUM(CASE WHEN CustomerStatus_Value = 'A' THEN 1 ELSE 0 END) AS Active,
       SUM(CASE WHEN CustomerStatus_Value = 'B' THEN 1 ELSE 0 END) AS Blocked,
       SUM(CASE WHEN CustomerStatus_Value = 'C' THEN 1 ELSE 0 END) AS Cancelled,
       COUNT(*) AS All
    FROM CustomerStatusEntries
    GROUP BY Branch;

Answer 3

標準 SQL でこれを行うことができます。

select branch_code,
       sum(case when CustomerStatus_Value = 'E' then 1 else 0 end) as Created,
       sum(case when CustomerStatus_Value = 'B' then 1 else 0 end) as Blocked,
       ...
from t
group by branch_code
order by 1