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Iamp;#39;m running a bit short on time so this is going to be a quick and dirty oversimplified explanation of multi-dimensional indexes we already know what an index is and we already know they can be placed on any column we also know that when we create a primary key an index is also automatically created when we have more than one column in a primary key or in other words a composite key we now have a multi-dimensional index we can also create a multi-dimensional index through concatenation essentially this means we are creating one index across multiple columns keep in mind when creating a concatenated index you want to be very careful in how you choose the column order we want to make sure that it can be used as often as possible so are they useful absolutely there are some situations in which youamp;#39;ll have no choice but to use multi-dimensional indexes for example a geographical information system may need to store two points longitude and latitude in a two-dimensional spac