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Written by Oleksandr Gavenko (AKA gavenkoa), compiled at 2015-10-05
from rev 764bb173578d
.
SQL.¶
Contents
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.