Example: tourism industry
Merge with Caution: How to Avoid Common Problems When ...

Merge with Caution: How to Avoid Common Problems When ...

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were not ordered and are not relevant. In SQL parlance, we would like a left outer join, not a full outer join. While there are many ways this can be accomplished in the DATA step, a common approach is to use the IN= dataset option in conjunction with a subsetting IF statement as follows: data merge3b; merge orders(in=ordered) products; by ...

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