How can Oracle merge rows of data?

Oracle can use the MERGE statement to merge row data. The MERGE statement can merge data from the source table into the target table based on specified conditions, and can perform insert, update, or delete operations as needed.

Here is an example of a MERGE statement:

MERGE INTO 目标表名 t
USING 源表名 s
ON (t.列名 = s.列名)
WHEN MATCHED THEN
  UPDATE SET t.列名 = s.列名
WHEN NOT MATCHED THEN
  INSERT (列名1, 列名2, ...)
  VALUES (s.列名1, s.列名2, ...)

The target table is the table where the data will be merged, and the source table is where the data to be merged comes from. The ON clause specifies the conditions for the merge operation: if the conditions are met for both the source and target tables, an update operation will be performed; if the conditions are not met, an insert operation will be executed.

In the UPDATE SET clause, you can specify the columns that need to be updated and their corresponding values.

In the INSERT clause, you can specify the columns to insert and their corresponding values.

It is important to note that a MERGE statement must include at least one of the WHEN MATCHED clause or WHEN NOT MATCHED clause.

This is a simple example and can be modified and adjusted based on specific needs and table structures when actually used.