SQL-99 Complete, Really by Peter Gulutzan & Trudy Pelzer.
From the preface:
If you’ve ever used a relational database product, chances are that you’re already familiar with SQL — the internationally-accepted, standard programming language for databases whic is supported by the vast majority of relational database management system (DBMS) products available today. You may also have noticed that, despite the large number of “reference” works that claim to describe standard SQL, not a single one provides a complete, accurate and example-filled description of the entire SQL Standard. This book was written to fill that void.
True, this is the SQL-99 standard.
I collect old IT standards and books about old IT standards. The standards we draft today address issues that have been seen before, just not dressed in current fashion.
By attempting to understand what worked and what perhaps didn’t in older standards, we can make new mistakes instead of repeating old ones.