This page allows you to directly submit a SQL (Structured Query Language)
query to the SDSS database server. You can modify the default query as you wish, or cut and paste a query from the SDSS Sample Queries page.
To be fair to other users, queries run from SkyServer search
tools are restricted in how long they can run and how much output they
return, by timeouts and row limits. Please see the Query Limits help page.
To run a query that is not restricted by a timeout or number of rows returned, please use the CasJobs batch query service.
To find out more about the database schema use the Schema Browser.
For an introduction to the Structured Query Language (SQL), please see
SQL Intro help page.
please read the Optimizing Queries
The inclusion of the imaging and spectro columns for DAS upload in your query (as in the
default query on this page) will ensure that when you press Submit, the appropriate
button(s) are displayed on the query results page to allow you to upload the necessary
information to the DAS to retrieve the FITS file data corresponding to your CAS query. The
imaging columns needed for upload to the DAS are run, rerun, camcol, and
field. The spectroscopic columns needed are plate, mjd, fiberid,
and optionally sprerun (the latter requires a join with the PlateX table).