Cursors and ANSI System-Time Table Queries | Teradata Vantage - 17.05 - Cursors and ANSI System-Time Table Queries - Teradata Database

Teradata Vantage™ - ANSI Temporal Table Support

Advanced SQL Engine
Teradata Database
June 2020
Programming Reference

A cursor is a data structure that stored procedures and Preprocessor2 use at runtime to point to the result rows in a response set returned by an SQL query. Procedures and embedded SQL also use cursors to manage inserts, updates, execution of multistatement requests, and SQL macros.

The DML semantics described for system-versioned system-time tables apply to DML associated with a cursor, with some limitations that relate to positioned (updatable) cursors:
  • A SELECT statement on a temporal table can open an updatable cursor if the statement conforms to all existing rules on updatable cursors.
  • A SELECT or DELETE statement that opens an updatable cursor has the same syntax as described in Teradata Vantage™ - SQL Data Manipulation Language, B035-1146, but for system-versioned system-time tables the FROM clause cannot t include the special ANSI temporal FOR SYSTEM TIME clause.

Related Information

For more information on... See...
cursors Teradata Vantage™ - SQL Stored Procedures and Embedded SQL , B035-1148