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SQL Search
NOTE: 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 the SQL Intro help page. In particular, please read the Optimizing Queries section in that document. If your query is timing out or running much slower than you think it should, please see also the the BookMark Lookup bug section of the SQL Intro.