Idea of Query Inner Join Icon
It's a logo of Query Inner Join reduced to two connecting circles. It looks like a compare and contrast diagram that our teachers used to make us do in school. The middle has dots in it.
This Query Inner Join icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,200 icons, all in the same style and quality.