Comment by bch

Re: Tcl and C -- SQLite originated as a Tcl extension (written in C). Richard Hipp (the principle author) also used to sit on the Tcl Core Team and though doesn't officially fill that position anymore, is active in the Tcl community. Tcl has been (and is) a very important part of SQLite. This is why you'll see examples in Tcl, and the test-suite written in Tcl.

Hipp himself admits SQLite wouldn't have been possible without Tcl.