請(qǐng)教：876錯(cuò)誤？

blue__fish

-876    Cannot issue SET TRANSACTION once a transaction has
started.

When a transaction is active, do not issue a SET TRANSACTION statement.
A transaction becomes active when a DDL or a DML statement is issued.
The only statements that you can place between the BEGIN WORK and the
SET TRANSACTION statements are SET statements such as SET EXPLAIN, SET
CONSTRAINT, SET DATASKIP, and so on.


這種錯(cuò)誤是什么原因引起的？如何解決？