2e70ab71_Server_Tools___Getting_Started__Tool
[What it Does] Lets you search the database for all objects that meet any criteria you can think of, then returns whatever photometric or spectroscopic data you request. The SQL search tool is the most powerful tool on SkyServer; professional astronomers use a very similar tool in their research. [Use it when...] you want to answer a specific astronomical research question quickly. [Tool] 
SQL Search
SkyServer Tools - Getting Started
Tool