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missing-data

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Finding values from a table that are *not* in a grouping of another table and what group that value is missing from?
I hope I am not missing something very simple here.I have done a Google search(es) and searched through Stack Overflow.
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T-SQL query to find missing IDs for a date range
Given these tables table Channel -------------- ChannelID int IDENTITY <other irrelevant stuff> table P开发者_StackOverflow中文版rogram
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R lag over missing data
Is there a variant of lag somewhere that keeps NAs in position? I want to compute returns of price data where data could be missing.
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