MySQL case语句中的额外列条件不起作用

Question

我有一个条件，即MySQL中的某个字段可以具有相同的值（端口号），但可以根据主机ID代表两个不同的设备。我有以下，但它似乎并没有工作：

SELECT s.name AS 'ingester', 
    d.dev_used AS 'size', 
    Cast(CASE d.namespace_port 
     (WHEN 4015 AND d.das_station IN(11,22,23)) THEN 'BPN1' 
     (WHEN 4015 AND d.das_station NOT IN(11,22,23)) THEN 'SJC12' 
     WHEN 4016 THEN 'SJC17' 
     WHEN 4017 THEN 'SJC18' 
     WHEN 4018 THEN 'SJC19' 
     WHEN 4019 THEN 'SJC5' 
     WHEN 4020 THEN 'SJC6' 
     WHEN 4021 THEN 'SJC7' 
     WHEN 4022 THEN 'SJC8' 
     WHEN 4023 THEN 'SJC9' 
     WHEN 4024 THEN 'SJC10' 
     WHEN 4025 THEN 'SJC11' 
     WHEN 4026 THEN 'SJC20' 
     WHEN 4027 THEN 'SJC13' 
     WHEN 4028 THEN 'SJC14' 
     WHEN 4029 THEN 'SJC15' 
     WHEN 4030 THEN 'SJC16' 
    END AS CHAR) AS namespace, 
    Date_format(d.date_attached, '%b-%e-%Y %l:%i %p') AS 'date_attached', 
    Date_format(d.replication_started, '%b-%e-%Y %l:%i %p') AS 'date_started', 
    Date_format(d.replication_completed, '%b-%e-%Y %l:%i %p') AS 'date_finished', 
    Date_format(d.date_detached, '%b-%e-%Y %l:%i %p') AS 'date_detached' 
FROM das.stations s, 
     das.device d 
WHERE d.das_station = s.id 
AND svcid = "trrq" 
ORDER BY d.date_attached DESC 

阅读MYSQL CASE STATEMENT MULTIPLE CONDITIONS，看来这应该是可能的，但是当我尝试和执行查询，我得到如下：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '4015 AND d.das_station IN(11,22,23)) THEN 'BPN1' 
4015 AND d.das_station NOT IN (1' at line 4 

在像这样的case语句中不可能有AND条件吗？

编辑：看来粘贴到MySQL不喜欢查询

mysql> SELECT s.name AS 'ingester', 
    ->  d.dev_used AS 'size', 
    ->  Cast(CASE d.namespace_port 
    -> 
Display all 891 possibilities? (y or n) 
    -> (4015 AND d.das_station IN (11,22,23)) THEN 'BPN1' 
    -> 
Display all 891 possibilities? (y or n) 
    -> (4015 AND d.das_station NOT IN (11,22,23)) THEN 'SJC12' 
    ->   WHEN 4016 THEN 'SJC17' 
    ->   WHEN 4017 THEN 'SJC18' 
    ->   WHEN 4018 THEN 'SJC19' 
    ->   WHEN 4019 THEN 'SJC5' 
    ->   WHEN 4020 THEN 'SJC6' 
    ->   WHEN 4021 THEN 'SJC7' 
    ->   WHEN 4022 THEN 'SJC8' 
    ->   WHEN 4023 THEN 'SJC9' 
    ->   WHEN 4024 THEN 'SJC10' 
    ->   WHEN 4025 THEN 'SJC11' 
    ->   WHEN 4026 THEN 'SJC20' 
    ->   WHEN 4027 THEN 'SJC13' 
    ->   WHEN 4028 THEN 'SJC14' 
    ->   WHEN 4029 THEN 'SJC15' 
    ->   WHEN 4030 THEN 'SJC16' 
    ->  END AS CHAR) AS namespace, 
    ->  Date_format(d.date_attached, '%b-%e-%Y %l:%i %p') AS 'date_attached', 
    ->  Date_format(d.replication_started, '%b-%e-%Y %l:%i %p') AS 'date_started', 
    ->  Date_format(d.replication_completed, '%b-%e-%Y %l:%i %p') AS 'date_finished', 
    ->  Date_format(d.date_detached, '%b-%e-%Y %l:%i %p') AS 'date_detached' 
    -> FROM das.stations s, 
    ->  das.device d 
    -> WHERE d.das_station = s.id 
    -> AND svcid = "trrq" 
    -> ORDER BY d.date_attached DESC 

如果我删除行包，它似乎正确粘贴，但仍然是不尊重的第二场：

mysql> SELECT s.name AS 'ingester', d.das_station, d.dev_used AS 'size',  Cast(CASE d.namespace_port WHEN (4015 AND d.das_station = 11) THEN 'BPN1' WHEN (4015 AND d.das_station NOT IN(11,22,23)) THEN 'SJC12' WHEN 4016 THEN 'SJC17' WHEN 4017 THEN 'SJC18' WHEN 4018 THEN 'SJC19' WHEN 4019 THEN 'SJC5' WHEN 4020 THEN 'SJC6' WHEN 4021 THEN 'SJC7' WHEN 4022 THEN 'SJC8' WHEN 4023 THEN 'SJC9' WHEN 4024 THEN 'SJC10' WHEN 4025 THEN 'SJC11' WHEN 4026 THEN 'SJC20' WHEN 4027 THEN 'SJC13' WHEN 4028 THEN 'SJC14' WHEN 4029 THEN 'SJC15' WHEN 4030 THEN 'SJC16' END AS CHAR) AS namespace,  Date_format(d.date_attached, '%b-%e-%Y %l:%i %p') AS 'date_attached',  Date_format(d.replication_started, '%b-%e-%Y %l:%i %p') AS 'date_started',  Date_format(d.replication_completed, '%b-%e-%Y %l:%i %p') AS 'date_finished',  Date_format(d.date_detached, '%b-%e-%Y %l:%i %p') AS 'date_detached' FROM das.stations s,  das.device d WHERE d.das_station = s.id AND svcid = "trrq" ORDER BY d.date_attached DESC; 
+---------------+-------------+------+-----------+---------------------+--------------+---------------------+---------------------+ 
| ingester  | das_station | size | namespace | date_attached  | date_started | date_finished  | date_detached  | 
+---------------+-------------+------+-----------+---------------------+--------------+---------------------+---------------------+ 
| ca-adsdas2-p1 |   11 | NULL | NULL  | Jan-20-2016 1:42 PM | NULL   | NULL    | Jan-21-2016 3:16 PM | 
| ca-adsdas2-p1 |   11 | NULL | NULL  | Dec-21-2015 7:25 PM | NULL   | Dec-26-2015 9:22 PM | Jan-20-2016 1:33 PM | 
+---------------+-------------+------+-----------+---------------------+--------------+---------------------+---------------------+ 

如果das_station = 11，它应该在命名空间中声明“BPN1”，而不是null。

Answer 1

通过在WHENs的namespace_port，这样解决：

SELECT s.name AS 'ingester', 
    d.dev_used AS 'size', 
    Cast(CASE WHEN (d.namespace_port = 4015 AND d.das_station IN (11,22,23)) THEN 'BPN1' WHEN (d.namespace_port = 4015 AND d.das_station NOT IN (11,22,23)) THEN 'SJC12' WHEN d.namespace_port = 4016 THEN 'SJC17' WHEN d.namespace_port = 4017 THEN 'SJC18' WHEN d.namespace_port = 4018 THEN 'SJC19' WHEN d.namespace_port = 4019 THEN 'SJC5' WHEN d.namespace_port = 4020 THEN 'SJC6' WHEN d.namespace_port = 4021 THEN 'SJC7' WHEN d.namespace_port = 4022 THEN 'SJC8' WHEN d.namespace_port = 4023 THEN 'SJC9' WHEN d.namespace_port = 4024 THEN 'SJC10' WHEN d.namespace_port = 4025 THEN 'SJC11' WHEN d.namespace_port = 4026 THEN 'SJC20' WHEN d.namespace_port = 4027 THEN 'SJC13' WHEN d.namespace_port = 4028 THEN 'SJC14' WHEN d.namespace_port = 4029 THEN 'SJC15' WHEN d.namespace_port = 4030 THEN 'SJC16' END AS CHAR) AS namespace, 
    Date_format(d.date_attached, '%b-%e-%Y %l:%i %p') AS 'date_attached', 
    Date_format(d.replication_started, '%b-%e-%Y %l:%i %p') AS 'date_started', 
    Date_format(d.replication_completed, '%b-%e-%Y %l:%i %p') AS 'date_finished', 
    Date_format(d.date_detached, '%b-%e-%Y %l:%i %p') AS 'date_detached' 
FROM das.stations s, 
     das.device d 
WHERE d.das_station = s.id 
AND svcid = "96wa" 
ORDER BY d.date_attached DESC 

结果如下：

+------------------+--------------+-----------+---------------------+---------------------+----------------------+---------------------+ 
| ingester   | size   | namespace | date_attached  | date_started  | date_finished  | date_detached  | 
+------------------+--------------+-----------+---------------------+---------------------+----------------------+---------------------+ 
| bpn-dasingest-p2 |   NULL | NULL  | Mar-29-2017 7:41 AM | NULL    | NULL     | Mar-30-2017 8:58 AM | 
| bpn-dasingest-p2 | 247547875328 | BPN1  | Mar-27-2017 7:55 AM | Mar-27-2017 9:33 AM | Mar-27-2017 12:27 PM | Mar-29-2017 7:41 AM | 
+------------------+--------------+-----------+---------------------+---------------------+----------------------+---------------------+