Rating: 

I have a copy of the 1st edition and recently downloaded the sample code.

I have to concur with Andy Wong Man Boon, above, that the sample code is pretty crummy. I downloaded the code because I'd a particular interest in the SQL grammar, and found that the sql1 example didn't compile, complaining about being unable to resolve yywrap(). After fixing this problem (either by linking with -lfl or putting in a substitute yywrap()), I then found that the executable gave:

<blockquote>

1: syntax error at FROM

SQL parse failed

</blockquote>

when fed SELECT foo FROM bar;!

Now, I'm no expert (otherwise I wouldn't have the book), but it seems to me that simple queries like this aren't allowed by the grammar in sql1.y. I got it to work by putting the following into the grammar:

<blockquote>

sql: query_exp

;

</blockquote>

How trustworthy can the code, or the book, be when this kind of simple mistake is made?

Emmet