Question

我有SQL Server 2016，我正在尝试为视图中的json列创建索引。

视图本身是在json上构建的，如下所示

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

我正在尝试在_id和一些datetime列上构建索引。我收到一个错误：

为Index＆＃39; NonClusteredIndex-20161124-152652＆＃39;创建失败。（Microsoft.SqlServer.Smo）

执行Transact-SQL语句或批处理时发生异常。（Microsoft.SqlServer.ConnectionInfo）

无法在观看＆＃39; dbo.vTrades＆＃39;上创建索引。它没有唯一的聚簇索引。（Microsoft SQL Server，错误：1940）

angular.forEach

Answer 1

只需在表/视图上创建一个唯一的聚簇索引。

CREATE UNIQUE CLUSTERED INDEX cu_indx_ID ON vTrades (id);

然后你应该能够创建你想要的非聚集索引。

<强>更新

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如何为json列SQL Server 2016创建索引

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