mysql的更新与选择最小/最大计数组

Question

我有一个简单的表是这样的：

id grouped type_error 
-- ------- ------------------ 
1 1-0  TL   
2 1-0  TL   
3 1-0  TL   
4 1-1  TL   
5 1-2  TL  
6 1-2  TL  
7 1-3  TL  
8 1-3  TL  
9 1-3  TL  
10 1-3  TL  

我只是想更新表是这样的：

id grouped type_error 
-- ------- ------------------ 
1 1-0  FN   
2 1-0  FN   
3 1-0  FN   
4 1-1  TL   
5 1-2  TL  
6 1-2  TL  
7 1-3  FN  
8 1-3  FN  
9 1-3  FN  
10 1-3  FN  

我想更新其中，分组计数为3分钟，最大5：

我只是有我这样的查询：

update errorlog set type_error = 'FN' where id in 
(select group_concat(id) as ids from errorlog where ids > 2 group by grouped) 

但是，它不工作。我得到的错误

未知列 'IDS' 中的 'where子句'

Answer 1

您可以采用如下方案，与子选择：

UPDATE errorlog SET type_error = 'FN' 
WHERE grouped IN (
    SELECT * FROM (
    SELECT grouped 
    FROM errorlog 
    GROUP BY grouped 
    HAVING COUNT(id) BETWEEN 3 AND 5 
)x 
); 

这里你可以找到一个工作演示：http://sqlfiddle.com/#!9/311a01/1/0

Answer 2

UPDATE table SET type_error = 'FN' 
WHERE grouped IN (
    SELECT grouped 
    FROM table 
    GROUP BY grouped 
    HAVING COUNT(id) BETWEEN 3 AND 5 
) 

不幸的是产生在MySQL的错误：

ERROR 1093 (HY000): You can't specify target table 'errorlog' for update in FROM clause 

因此扩大在Sebastian答案我会做这两个步骤：

MariaDB [test]> 
MariaDB [test]> drop table IF EXISTS targets; 
Query OK, 0 rows affected, 1 warning (0.00 sec) 

MariaDB [test]> 
MariaDB [test]> create temporary table IF NOT EXISTS targets as 
    -> (SELECT grouped 
    ->  FROM errorlog 
    ->  GROUP BY grouped 
    ->  HAVING COUNT(id) BETWEEN 3 AND 5); 
Query OK, 2 rows affected (0.01 sec) 
Records: 2 Duplicates: 0 Warnings: 0 

MariaDB [test]> 
MariaDB [test]> UPDATE errorlog a SET type_error = 'FN' 
    -> WHERE exists (select 1 from targets t where t.grouped = a.grouped); 
Query OK, 7 rows affected (0.00 sec) 
Rows matched: 7 Changed: 7 Warnings: 0 

MariaDB [test]> 
MariaDB [test]> select * from errorlog order by id; 
+------+---------+------------+ 
| id | grouped | type_error | 
+------+---------+------------+ 
| 1 | 1-0  | FN   | 
| 2 | 1-0  | FN   | 
| 3 | 1-0  | FN   | 
| 4 | 1-1  | TL   | 
| 5 | 1-2  | TL   | 
| 6 | 1-2  | TL   | 
| 7 | 1-3  | FN   | 
| 8 | 1-3  | FN   | 
| 9 | 1-3  | FN   | 
| 10 | 1-3  | FN   | 
+------+---------+------------+ 
10 rows in set (0.00 sec)