SQL Server - 如何在更新命令上提示索引? [英] SQL Server - How to Hint an Index on an Update command?

问题描述

我正在尝试执行以下命令来强制更新使用非聚集索引:

I'm trying to execute the following command to force an update to use a non-clustered index:

 UPDATE Flights 
 SET Airtime=5555678
 WHERE Distance=10000
 OPTION (TABLE HINT(Flights, INDEX (DistanceIndex)))

...它出错了:

消息 8724，第 16 级，状态 1，第 75 行
无法执行查询.不能在 TABLE HINT 子句中指定表值或 OPENROWSET 函数Flights".

Msg 8724, Level 16, State 1, Line 75
Cannot execute query. Table-valued or OPENROWSET function 'Flights' cannot be specified in the TABLE HINT clause.

我找不到任何关于如何在 TABLE HINT 语句中正确形成语法的明确建议.

I can't find any clear advice on how the syntax should be properly formed inside the TABLE HINT statement.

谁能告诉我哪里出错了?

Please can anyone advise where I'm going wrong?

推荐答案

尝试以下:

UPDATE F
SET F.Airtime=5555678
FROM Flights F WITH (INDEX (DistanceIndex))
WHERE F.Distance=10000

或

UPDATE Flights
SET Airtime=5555678
FROM Flights -- this line is added to your initial query
WHERE Distance=10000
OPTION (TABLE HINT(Flights, INDEX (DistanceIndex)))

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