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[英]mssql - copy different datatypes datas from one column to another column in same table
[英]Usage of result from one column in computation in different column in MSSQL Server
我試圖在MS SQL Server的更高版本中的計算中使用一列的結果。
以下是我的SQL代碼:
SELECT
(SELECT 'EURUSD' AS a) AS symbol_name,
(SELECT TOP 1 ROUND(p.BidLast,5) FROM mt5_prices p WHERE p.Symbol LIKE 'EURUSD%') AS Bid,
(SELECT SUM(m.Volume)
FROM mt5_positions m
WHERE m.Symbol LIKE 'EURUSD%' AND m.Login IN (SELECT u.Login FROM mt5_users u WHERE u."Group" LIKE 'real%') AND m."Action" = 0) AS TotalBuy,
(SELECT CASE
WHEN 'EURUSD' LIKE 'USOIL%' OR 'EURUSD' LIKE 'UKOIL%' OR 'EURUSD' LIKE 'Bund%' THEN ROUND(TotalBuy/10*Bid,2)
WHEN 'EURUSD' LIKE 'NGAS%' OR 'EURUSD' LIKE 'Copper%' THEN ROUND(TotalBuy/1*Bid,2)
ELSE ROUND(TotalBuy/100*Bid,2) END) AS ExpositionBuyLots
當然,返回的錯誤是:
SQL錯誤(207):無效的列名'TotalBuy'
無效的列名稱“出價”。
我的問題是:如何使用TotalBuy
和Bid
列中已經 (或可以說是“即時”)計算的結果? 我閱讀了有關計算列的信息,但不幸的是,無法修改數據庫。
MS SQL Server 2012版本。
編輯:以上功能在MySQL中可用,我希望在MS SQL中也可以實現。 如果有人對解決方案感興趣(我選擇@Damien,因為它與原始MySQL查詢最接近(是的,它是查詢,從MySQL重寫為MSSQL),即僅需進行少量SQL修改):
SELECT * FROM
(SELECT 'EURUSD' AS symbol_name) symbol_name
CROSS apply
(SELECT TOP 1 ROUND(p.AskLast,5) AS Ask FROM mt5_prices p WHERE p.Symbol LIKE 'EURUSD%') Ask
CROSS apply
(SELECT TOP 1 ROUND(p.BidLast,5) AS Bid FROM mt5_prices p WHERE p.Symbol LIKE 'EURUSD%') Bid
CROSS apply
(SELECT SUM(m.Volume) AS TotalBuy
FROM mt5_positions m
WHERE m.Symbol LIKE 'EURUSD%' AND m.Login IN (SELECT u.Login FROM mt5_users u WHERE u."Group" LIKE 'real%') AND m."Action" = 0) TotalBuy
CROSS apply
(SELECT SUM(m.Volume) AS TotalSell
FROM mt5_positions m
WHERE m.Symbol LIKE 'EURUSD%' AND m.Login IN (SELECT u.Login FROM mt5_users u WHERE u."Group" LIKE 'real%') AND m."Action" = 1) TotalSell
CROSS apply
(SELECT (CASE
WHEN 'EURUSD' LIKE 'USOIL%' OR 'EURUSD' LIKE 'UKOIL%' OR 'EURUSD' LIKE 'Bund%' THEN ROUND(TotalBuy/10*Bid,2)
WHEN 'EURUSD' LIKE 'NGAS%' OR 'EURUSD' LIKE 'Copper%' THEN ROUND(TotalBuy/1*Bid,2)
ELSE ROUND(TotalBuy/100*Bid,2) END) AS ExpositionBuyLots) ExpositionBuyLots
您可以使用另一個子查詢塊來實現此目的:
SELECT (
CASE
WHEN 'EURUSD' LIKE 'USOIL%'
OR 'EURUSD' LIKE 'UKOIL%'
OR 'EURUSD' LIKE 'Bund%'
THEN ROUND(TotalBuy / 10 * Bid, 2)
WHEN 'EURUSD' LIKE 'NGAS%'
OR 'EURUSD' LIKE 'Copper%'
THEN ROUND(TotalBuy / 1 * Bid, 2)
ELSE ROUND(TotalBuy / 100 * Bid, 2)
END
) AS ExpositionBuyLots, *
FROM (
SELECT ( SELECT 'EURUSD' AS a ) AS symbol_name
,( SELECT TOP 1 ROUND(p.BidLast, 5)
FROM mt5_prices p
WHERE p.Symbol LIKE 'EURUSD%'
) AS Bid
,( SELECT SUM(m.Volume)
FROM mt5_positions m
WHERE m.Symbol LIKE 'EURUSD%'
AND m.LOGIN IN (
SELECT u.LOGIN
FROM mt5_users u
WHERE u."Group" LIKE 'real%'
)
AND m."Action" = 0
) AS TotalBuy
) AS R
您可以使用cross apply
(或子查詢)來引入其他select
子句。 每個select
子句都是“好像”並行計算所有表達式的-這就是為什么單個select
子句中的表達式之間不能存在依賴關系的原因。
例如:
select
*
from
sys.objects
cross apply
(select object_id + 10 as mega_object_id) u
cross apply
(select mega_object_id / 30 as little_object_id) w
您應該使用APPLY
運算符。 您可以在APPLY
使用YourTable
中的值
SELECT
ExpositionBuyLots = CASE
WHEN 'EURUSD' LIKE 'USOIL%' OR 'EURUSD' LIKE 'UKOIL%' OR 'EURUSD' LIKE 'Bund%' THEN ROUND(ComputedValues.TotalBuy/10*ComputedValues.Bid,2)
WHEN 'EURUSD' LIKE 'NGAS%' OR 'EURUSD' LIKE 'Copper%' THEN ROUND(ComputedValues.TotalBuy/1*ComputedValues.Bid,2)
ELSE ROUND(ComputedValues.TotalBuy/100 * ComputedValues.Bid,2) END
FROM YourTable
OUTER APPLY (
SELECT
symbol_name = 'EURUSD',
Bid = (SELECT TOP 1 ROUND(p.BidLast,5) FROM mt5_prices p WHERE p.Symbol LIKE 'EURUSD%') ,
TotalBuy = (SELECT SUM(m.Volume)
FROM mt5_positions m
WHERE m.Symbol LIKE 'EURUSD%' AND m.Login IN (SELECT u.Login FROM mt5_users u WHERE u."Group" LIKE 'real%') AND m."Action" = 0
)
) ComputedValues
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