将两个计算属性合并为一个

const obj1 = {
  prop1: 'value1',
  get prop2() {
    return this.prop1 + ' - computed';
  }
};

const obj2 = {
  prop3: 'value3',
  get prop4() {
    return this.prop3 + ' - computed';
  }
};

const mergedObj = Object.assign({}, obj1, obj2);

console.log(mergedObj.prop2); // Output: value1 - computed
console.log(mergedObj.prop4); // Output: value3 - computed

class MyClass1:
    @property
    def prop1(self):
        return 'value1'

    @property
    def prop2(self):
        return self.prop1 + ' - computed'

class MyClass2:
    @property
    def prop3(self):
        return 'value3'

    @property
    def prop4(self):
        return self.prop3 + ' - computed'

obj1 = MyClass1()
obj2 = MyClass2()

merged_obj = type('MergedClass', (obj1.__class__, obj2.__class__), {})

merged_obj_instance = merged_obj()

print(merged_obj_instance.prop2)  # Output: value1 - computed
print(merged_obj_instance.prop4)  # Output: value3 - computed

CREATE TABLE table1 (
    id INT,
    value1 VARCHAR(255)
);

INSERT INTO table1 (id, value1) VALUES (1, 'value1');

CREATE TABLE table2 (
    id INT,
    value2 VARCHAR(255)
);

INSERT INTO table2 (id, value2) VALUES (1, 'value2');

SELECT CONCAT(table1.value1, ' - computed') AS merged_prop
FROM table1
JOIN table2 ON table1.id = table2.id;