An SQL parser, generated from Bison (Yacc) and Flex (Lex).

Original version - most of the work - comes from John Levine's Flex & Bison book published by O'Reilley.

$ echo "SELECT a.name,b.address FROM people ORDER BY name;" | ./sql

1. GNU Flex
2. GNU bison
3. GNU autotools (autoconf, automake, etc.)
4. A C compiler

$ ./autogen.sh
$ ./configure
$ make && make check
$ sudo make install