oracle merge into update语法
The syntax for the Oracle MERGE INTO UPDATE statement is as follows:
```
MERGE INTO target_table
USING source_table
ON (join_condition)
WHEN MATCHED THEN
  UPDATE SET column1 = value1, column2 = value2 ...
```
Explanation:
- The `target_table` is the table to be updated.
- The `source_table` is the table from which the data is being merged.
- The `join_condition` determines the matching rows between the target and source tables.
- The `WHEN MATCHED THEN` clause specifies the action to perform when a match is found.
- The `UPDATE SET` clause updates the columns in the target table based on the specified values.
Example:
Suppose we have a target table called "employees" with columns "employee_id" and "salary". We want to update the salary of employees based on the employee_id matching with the source table "employee_updates" with columns "employee_id" and "new_salary".update语法大全
```
MERGE INTO employees
USING employee_updates
ON (ployee_id = ployee_id)
WHEN MATCHED THEN
  UPDATE SET employees.salary = w_salary;
```
This statement will update the salary of employees in the "employees" table based on the matching employee_id values from the "employee_updates" table.

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