There are quite a few commands in Statistics that can do this. Another one to look at is Analyze > Descriptive Statistics > Explore. Its output includes the IQR among other statistics. See also Analyze > Tables > Custom Tables and Analyze > Compare Means > Means.
If you haven't explored editing pivot tables, try double clicking one and selecting Pivot > Pivot Trays. This allows you to rearrange the dimensions of a table, so you can position statistics, group info, and variables in different ways to suit your purpose.
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