Question

我将两个表的内容执行这样的连接：

SELECT * FROM table1
     INNER JOIN table2
     ON table1.code = table2.code

现在table1的结构如下：

|CODE|Info|Created          |Modified
|R789|Home|21/03/2016 10:00 |21/03/2016 15:00

和table2：

|CODE|Description|Created       |Modified
|R789|Testing| 21/03/2016 10:05 | 21/03/2016  18:10

现在的问题是查询返回了这个结果：

"Code":"RB01",
"Info":Home,
"Created":"21/03/2016 10:05",
"Modified":"21/03/2016 18:10",
"Description":"Testing"

如何看待我在两个表中有created和modified相同的内容。因此，查询会丢弃created的{{1}}和modified ..这对我来说是一个问题，我该如何避免这种情况？

Answer 1

您需要使用AS keyword to create an alias作为列名。考虑一下：

SELECT t1.CODE, t1.Info, t1.Created AS t1Created, t1.Modified AS t1Modified, t2.Description, t2.Created AS t2Created, t2.Modified AS t2Modified
    FROM table1 t1
    INNER JOIN table2 t2 ON t1.CODE = t2.CODE

这将返回

"Code":"RB01",
"Info":Home,
"t1Created":"21/03/2016 10:00",
"t1Modified":"21/03/2016 15:00",
"Description":"Testing",
"t2Created":"21/03/2016 10:05",
"t2Modified":"21/03/2016 18:10",

json可以包含相同的键值吗？

1 个答案: