Small. Fast. Reliable.
Choose any three.
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  *:More than one primary key per table, I can specify this with MySQL for example and SQLite returns me 
  an error: more than one primary key specified...
  
+ _: "More than one primary key" is an oxymoron when you're talking about the relational data model.  By definition, a primary key uniquely identfies a row.  What's the real problem you're trying to solve?
+ 
  *:UPDATE t1, t2 SET t1.f1 = value WHERE t1.f2 = t2.fa
  
  *:SHOW TABLES and DESCRIBE [tablename] would be nice - not sure if they're standard, but they are a