ISO/IEC 9075-4:2016 speci?es the syntax and semantics of a database language for declaring and maintaining persistent database language routines in SQL-server modules.
The database language for s and s includes:

- The speci?cation of statements to direct the ?ow of control.

- The assignment of the result of expressions to variables and parameters.

- The speci?cation of condition handlers that allow SQL-invoked routines to deal with various conditions that arise during their execution.

- The speci?cation of statements to signal and resignal conditions.

- The declaration of standing SQL-server cursors.

- The declaration of local variables.

It also includes the de?nition of the Information Schema tables that contain schema information pertaining to SQL-server modules and SQL-invoked routines.