How do the Oracle SQLJ 8.0.5 and 7.3.4 versions differ from the 8.1.5 versions?
They don’t. These versions differ in name and packaging only. Since SQLJ 8.1.5 is available with the Oracle 8.1.5 database we provide SQLJ 8.0.5/7.3.4 version for free download, so that programmers can use SQLJ in conjunction with 8.0.x or 7.3.4 JDBC drivers against an 8.0.x or 7.3.x database. The main discrepancies to keep in mind are restrictions (and some changes) when using the 8.0.x and 7.3.