Practice 4. What are the highest-redshift
quasars in the SDSS database?
Write a query to search for quasars for which we have
obtained spectra (search the specObj table) with
redshifts greater than 4.5 and high confidence measurements (zconf > .35).
Be sure to retrieve
both quasars and the objects classified as high-redshift quasars.
Retrieve each quasar's Photo ID, ra, dec, and redshift.
How many results do you get? |