Question

有没有办法获得表的（行，列）坐标？

示例：

tbl1:                              tbl2:
+--------+--------+--------+       +------+-----------+---------+
| Name   |   ROW  |   COL  |       |  ROW |  COL_0    |  COL_1  |
+--------+--------+--------+       +------+-----------+---------+
| VALUE1 |     0  |     0  |       |    0 |  OPEN     |  CLOSE  |
| VALUE2 |     2  |     1  |       |    1 |  RIGHT    |  LEFT   |
| VALUE3 |     1  |     0  |       |    2 |  OFFLINE  |  ONLINE |
+--------+--------+--------+       +------+-----------+---------+

结果如下：

+--------+----------+     
| Name   |   ROWCOL | 
+--------+----------+ 
| VALUE1 |   OPEN   | 
| VALUE2 |   ONLINE | 
| VALUE3 |   RIGHT  | 
+--------+----------+

提前致谢！

Answer 1

这是一个奇怪的要求，但我相信这会奏效：

SELECT name, 
CASE COL
  WHEN 0 THEN COL_0
  WHEN 1 THEN Col_1
END as rowcol
FROM tbl1 as t1
INNER JOIN tbl2 as t2
ON t1.ROW = t2.ROW

Answer 2

我认为依赖rownumbers等隐含数据并不是一个好主意。

我建议将tbl2重新组织成这样的东西：

create table tbl2 (
   rowid integer,
   colid integer,
   textvalue varchar(32)
);

数据看起来像

0 0 OPEN
0 1 CLOSE
1 0 RIGHT
1 1 LEFT
...

允许您使用

获取结果

select tbl1.name as Name, tbl2.textvaluevalue as ROWCOL
from tbl1, tbl2
where tbl1.ROW = tbl2.rowid and tbl1.COL = tbl2.colid

获取MySQL查询中表的坐标（行，列）

2 个答案: