*** Datasets must be sorted on key variables prior to merging. ***

Open 1toMany left.sav                 Open 1toMany right.sav 

Go to 1toMany left.sav → Data → Merge Files → Add Variables

A keyed table (also called lookup file) has two basic characteristics:

1. A keyed table has to have unique cases based on the key variable(s).
2. A keyed table doesn't contribute cases to the merged file. It contributes variables only.

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