uSQL stands for unnamedSQL, a course project for Introduction to Database Systems in 2014 fall, Tsinghua University.

• Install bison, flex etc.
• Run make
• ./usql or ./usql < input.sql

• -d target.db: use target.db as target directory, databases will be stored here
• -t: print execution time after every sql sentences
• -v: more verbose
• -g: enable debug on parser
• -h: help

see parser/sql.yy

• Better support for NULL
• Show meaningful information on "syntax error"
• Improve peformance when selecting from multiple tables
• Write more TODOs