json列のインデックスを作成する方法SQL Server 2016

Question

SQL Server 2016があり、ビュー内のjson列のインデックスを作成しようとしています。

SELECT   
    _id, 
    JSON_VALUE(trade, '$.direction') AS direction, 
    JSON_VALUE(trade, '$.entryprice') AS entryprice, 
    JSON_VALUE(trade, '$.exitprice') AS exitprice, 
    JSON_VALUE(trade, '$.potentialtarget') AS potentialtarget, 
    FORMAT(CAST(JSON_VALUE(trade, '$.entrytime') AS datetimeoffset), 'yyyy-MM-dd HH:mm:ss') AS entrytime, 
    FORMAT(CAST(JSON_VALUE(trade, '$.exittime') AS datetimeoffset), 'yyyy-MM-dd HH:mm:ss') AS exittime, 
    JSON_VALUE(trade, '$.maxfavourable') AS maxfavourable, 
    JSON_VALUE(trade, '$.maxagainst') AS maxagainst, 
    JSON_VALUE(trade, '$.signal') AS signal, 
    JSON_VALUE(trade, '$.instrument') AS instrument, 
    JSON_VALUE(trade, '$.account') AS account, 
    JSON_VALUE(trade, '$.quantity') AS quantity, 
    JSON_VALUE(trade, '$.gains') AS gains, 
    JSON_VALUE(trade, '$.hitedge') AS hitedge, 
    JSON_VALUE(trade, '$.RealizedProfitLoss') AS RealizedProfitLoss, 
    JSON_VALUE(trade, '$.CashValue') AS CashValue, 
    JSON_VALUE(trade, '$.BuyingPower') AS BuyingPower, 
    JSON_VALUE(trade, '$.maxagainst1ATR') AS maxagainst1ATR, 
    JSON_VALUE(trade, '$.maxagainst2ATR') AS maxagainst2ATR, 
    JSON_VALUE(trade, '$.Powerbars') AS powerbars, 
    JSON_VALUE(trade, '$.PowerbarsTime[0]') AS PowerbarsTime1, 
    JSON_VALUE(trade, '$.PowerbarsTime[1]') AS PowerbarsTime2, 
    JSON_VALUE(trade, '$.PowerbarsTime[2]') AS PowerbarsTime3, 
    JSON_VALUE(trade, '$.PowerbarsTime[3]') AS PowerbarsTime4, 
    JSON_VALUE(trade, '$.PowerbarsTime[4]') AS PowerbarsTime5, 
    JSON_VALUE(trade, '$.Powerbarsdetails') AS Powerbarsdetails, 
    JSON_VALUE(trade, '$.entrysignal') AS entrysignal, 
    JSON_VALUE(trade, '$.exitsignal') AS exitsignal 
FROM    
    dbo.Trades 

を次のように

ビュー自体は、JSON上に構築された私は、_idと日時列の一部にインデックスを構築しようとしています。私はエラーを取得する：

Create failed for Index 'NonClusteredIndex-20161124-152652'. (Microsoft.SqlServer.Smo)

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

Cannot create index on view 'dbo.vTrades'. It does not have a unique clustered index. (Microsoft SQL Server, Error: 1940)

Answer 1

ちょうどあなたのテーブル/ビューに独自のクラスタ化インデックスを作成します。

CREATE UNIQUE CLUSTERED INDEX cu_indx_ID ON vTrades (id); 

次に、ノンクラスタードインデックスを作成することができます。

更新：

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