ORA-14551: cannot perform a DML operation inside a query
时间: 2023-07-16 13:14:12 浏览: 62
ORA-14551 is an Oracle error message that occurs when you try to perform a DML (Data Manipulation Language) operation (such as INSERT, UPDATE, or DELETE) within a SELECT statement. In other words, you cannot modify data and query the same table at the same time.
To resolve this error, you need to separate the DML operation and the SELECT statement into two separate transactions. For example, you can perform the DML operation first and then run the SELECT statement on the modified data. Alternatively, you can use a subquery or a temporary table to separate the DML operation and the SELECT statement.
Here is an example of how to avoid ORA-14551 error:
```
BEGIN
-- Perform the DML operation
DELETE FROM my_table WHERE id = 123;
-- Query the modified data
SELECT * FROM my_table;
END;
```
In this example, the DML operation (DELETE) and the SELECT statement are separated into two separate transactions using a PL/SQL block.