| SQL
Concepts |
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| • | Data
are stored in a database |
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| • | Similar
data types are stored in tables: photoObj |
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| (photometry),
specObj (spectroscopy), etc. |
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| • | A
request to a database to return data is called a |
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| query |
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| • | Queries
usually request data that meets certain |
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| constraints |
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