SELECT *（table1），列名（table2）FROM table1 JOIN table2

Question

如何从第一个表中选择*，只从连接表中选择x列？

SELECT *(TABLE1), TABLE2.id, TABLE2.name
  FROM TABLE1
  JOIN TABLE2
ON TABLE1.id_test = TABLE2.id

Answer 1

尚未对其进行测试，但它应如下所示：

SELECT t1.*, t2.id, t2.name
  FROM TABLE1 t1
  JOIN TABLE2 t2
ON t1.id_test = t2.id

Answer 2

SELECT table1.*, table2.id, table2.name
FROM table1
JOIN table2
ON table1.id_test = table2.id

Answer 3

像这样：

SELECT TABLE1.*, TABLE2.id, TABLE2.name
  FROM TABLE1
  JOIN TABLE2
ON TABLE1.id_test = TABLE2.id

虽然确实你确实想要那个*，因为如果你不想要所有列都是内存浪费。