I like SQL. The relational model is often underestimated. All of the complex structure that goes beyond individual rows is orthogonal and is itself first-class

I like SQL. The relational model is often underestimated. All of the complex structure that goes beyond individual rows is orthogonal and is itself first-class data. Contrast with document databases where hierarchies are part of the low-level storage mechanism. By making the structure first-class data, the relational model keeps you from painting yourself into a corner.