MapStats/BasicQueries: Difference between revisions
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The [[MapStats]] activity can introduce students to basic queries. Queries are used to read information out of a database. |
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A query can be made by selecting values from a list, then pressing Run. |
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[[Image:MapStats4.png]] |
[[Image:MapStats4.png]] |
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The above query colors countries with any (ocean) coastline red. It can be run on any of the standard maps. |
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==Name Queries== |
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Each place has a name. You can use the query SELECT WHERE (name) IS (equal to) ( India ) to select India. |
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See what happens when you use (less than) or (greater than) with the (name) property. |
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Be aware: the Asia map may light up only part of some countries. |
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==Historical Queries== |
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Each country has a year of independence, and each state in the USA has two years (of becoming a US territory and becoming a state). |
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Be aware: |
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* SELECT WHERE (independence) IS (equal to) ( 1960 ) selects only countries which gained their independence in 1960. |
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* To select countries which gained independence by 1960, use (independence) IS (less than) ( 1961 ) |
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* The (territory) year is when the land was acquired, not the same as when it became an official territory |
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The years chosen were collected from Wikipedia and other online sources - there is no political intent. |
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Latest revision as of 21:50, 20 May 2009
The MapStats activity can introduce students to basic queries. Queries are used to read information out of a database.
A query can be made by selecting values from a list, then pressing Run.
The above query colors countries with any (ocean) coastline red. It can be run on any of the standard maps.
Name Queries
Each place has a name. You can use the query SELECT WHERE (name) IS (equal to) ( India ) to select India.
See what happens when you use (less than) or (greater than) with the (name) property.
Be aware: the Asia map may light up only part of some countries.
Historical Queries
Each country has a year of independence, and each state in the USA has two years (of becoming a US territory and becoming a state).
Be aware:
- SELECT WHERE (independence) IS (equal to) ( 1960 ) selects only countries which gained their independence in 1960.
- To select countries which gained independence by 1960, use (independence) IS (less than) ( 1961 )
- The (territory) year is when the land was acquired, not the same as when it became an official territory
The years chosen were collected from Wikipedia and other online sources - there is no political intent.