Mysql 获取行号

Question

我有一个table这样的

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

我想得到的是有行号

我试过这样做

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

确实有效...

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

但是如果我尝试 select 特定行呢？

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是1，但应该是4。

我怎样才能做到这一点？

Answer 1

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

Answer 2

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 t.* 之前或之后添加 @i:=@i+1 as row_number, 并加入 table 和 (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，希望它能有所帮助。

祝你好运！

Mysql 获取行号

Mysql get row number

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