- sql server will not use your order of joins if it thinks it can do it better. For example, if in your code a is joined to b and b to c but the index on a is enough to get the columns needed on c - it may join a to c.
- the only thing for certain is logical reads, not physical
- the determining factor for high % (for example , shown in sql sentry plan as red) is the amount of executions
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