Sloan Digital Sky Survey
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SQL Tutorial
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 1. Introduction
 2. A Simple Query
 Practice
 3. Common Searches
 4. More Samples
 Practice
 5. Multiple Tables
 Practice
 6. Aggregate Fcns.
 7. Group By
 8. Order By
 Practice
 9. Views
 10. Functions
 Practice
 11. Conclusion
SQL Tutorial

Practice Using Joins

Write queries to answer the astronomy questions in Practice 5 and 6. Use the Schema Browser when you need it.

Practice 5. How can you look up image data, plates and spectra of moderately bright nearby galaxies?

Write a query to find 100 galaxies for which we have spectra that have g magnitude between 17 and 17.4 and redshift less than 0.05. For each galaxy, retrieve the object ID, the five magnitudes (u,g,r,i,z), the redshift, the plate/MJD number, and the fiber number.

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Format HTML XML CSV

Enter your SQL query in the text box. The query is limited to 10 minutes and 100,000 rows.