MySQL获取行号

Question

我有这样的桌子

+------+----------+------------+
|   id |  1_value |   2_value  |
+------+----------+------------+
|    3 |   foo1   |   other    |
|   10 |   fooX   |   stuff    |
|   13 |   fooJ   |   here     |
|   22 |   foo7   |   and      |
|   31 |   foou   |   here     |
+------+----------+------------+

我想要得到的是拥有行号

我试图做这样的事情

SELECT  id, @curRow := @curRow + 1 AS row_number
FROM    table
JOIN    (SELECT @curRow := 0) r

而且确实有效...

+------+--------------+
|   id |  row_number  | 
+------+--------------+
|    3 |   1          | 
|   10 |   2          |
|   13 |   3          |
|   22 |   4          |
|   31 |   5          |
+------+--------------+

但是，如果我尝试选择特定的行怎么办？

SELECT  id, @curRow := @curRow + 1 AS row_number
FROM    srwk_esp_registration
JOIN    (SELECT @curRow := 0) r
WHERE ID = 22

在这种情况下，row_number为1，但应为4。

我该如何实现？

Answer 1

如果你不想声明一个变量（SET @rownum something）...

通常，我的正常查询是

SELECT t.* FROM ticket t

我会在@i:=@i+1 as row_number,之前或之后添加t.*并加入表格(SELECT @i:=0)：

SELECT @i:=@i+1 as row_number, t.* FROM ticket t, (SELECT @i:=0) AS temp

尝试更改示例查询并希望它会有所帮助。

祝你好运！

Answer 2

尝试使用子查询：

SELECT * 
FROM (
    SELECT id,
        @curRow := @curRow + 1 AS row_number
    FROM srwk_esp_registration
    JOIN (
        SELECT @curRow := 0
        ) r
    ) sub
WHERE sub.ID = 22