Since SQL:1999 the standard is divided into several parts numbered from 1 though 14 (as of SQL:2016). Some of them were never released (5-8, 12), others never became mainstream. Leaving the meta-part (part 1) aside, only part 2 (the SQL language), part 11 (Information Schema) and part 14 (XML) became widely implemented.
- Part 1 - Framework
A rough overview and some definitions of commonly used terms. The 2011 version of this part is available for free from ISO (look for SQL).
- Part 2 - Foundation
Defines most of the SQL language (other parts extend it—e.g., for XML functionality).
- Part 3 - Call-Level Interface (SQL/CLI)
Describes C and COBOL APIs to access SQL databases.
- Part 4 - Persisted Stored Modules (SQL/PSM)
Defines a language used for server-side programming (“stored procedures”).
- Part 5 - Host Language Bindings (SQL/Bindings)
Merged into part 2 with SQL:2003 (withdrawal notice).
- Part 6 - Global Transaction Support (SQL/Transaction)
- Part 7 - Temporal (SQL/Temporal)
Never released. Temporal support was eventually added to SQL:2011 part 2.
- Part 8 - Extended Object Support
Never released. Content absorbed into other parts (notice).
- Part 9 - Management of External Data (SQL/MED)
Defines mechanisms to access data stored outside the database.
- Part 10 - Object Language Bindings (SQL/OLB)
Defines how to embed SQL statements into Java programs. This is not JDBC, which treats SQL statements as strings (“dynamic SQL”).
- Part 11 - Information and Definition Schemas (SQL/Schemata)
DEFINITION_SCHEMA, which were covered in part 2 prior SQL:2003.
- Part 12 - Replication (SQL/Replication)
- Part 13 - Routines and Types Using the Java Programming Language (SQL/JRT)
Defines how to run Java inside the database.
- Part 14 - XML-Related Specifications (SQL/XML)
Defines the XML data type and methods to work on XML documents. Appeared with SQL:2003.
- Part 15 - Multi dimensional arrays
Not yet published (see ISO).