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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

SQL.

Joins.

http://www.codinghorror.com/blog/2007/10/a-visual-explanation-of-sql-joins.html
A Visual Explanation of SQL Joins.

Primary key length.

For int type (32-bit): NUMBER(9). For long type (64-bit): NUMBER(18).

Oracle allow up to 38 significant digits in NUMBER and up to 28 digits in SEQUENCE.

http://docs.oracle.com/cd/B28359_01/server.111/b28318/datatype.htm
Oracle Data Types
http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_6015.htm
CREATE SEQUENCE.
http://docs.oracle.com/cd/E19501-01/819-3659/gcmaz/index.html
Java Type to SQL Type Mappings.