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Showplan Operator of the Week – BookMark/Key Lookup

Fabiano continues in his mission to describe the major Showplan Operators used by SQL Server's Query Optimiser. This week he meets a star, the Key Lookup, a stalwart performer, but most famous for its role in ill-performing queries where an index does not 'cover' the data required to execute the query. If you understand why, and in what circumstances, key lookups are slow, it helps greatly with optimising query performance.

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Question of the Day

Converting Money

Does this run successfully on a SQL Server 2022, US English default installation?

DECLARE @YenAmount MONEY;
SET @YenAmount = ¥1500; 

SELECT @YenAmount AS RawValue;

See possible answers