ORA-29900: operator binding does not exist
Cause: There is no binding for the current usage of the operator.
Action: Change the operator arguments to match any of the existing bindings or add a new binding to the operator.
ORA-29900是Oracle 错误代码，代表绑定operator不存在。
SELECT column1 + column2 + column3 FROM table;
此时出现ORA-29900错误。