sql - 现有 DB2 列报告为不是表的列

Question

在 DB2 上运行的 Moodle 2 安装中，删除用户不成功，返回从数据库读取错误:

Debug info: [IBM][CLI Driver][DB2/LINUXX8664] SQL0206N "USERIDFROM" is not valid in the context where it is used. SQLSTATE=42703 SQLCODE=-206 SELECT * FROM mdl_message WHERE useridfrom = ? ORDER BY timecreated
[array ( 0 => '28521', )]

SQL0206N的错误描述很清楚，但是 useridfrom 是 mdl_message 的一列:

$ db2 describe table mdl_message

                          Data type                     Column
Column name               schema    Data type name      Length     Scale Nulls
------------------------- --------- ------------------- ---------- ----- ------
 ID                       SYSIBM    BIGINT                       8     0 No    
 USERIDFROM               SYSIBM    BIGINT                       8     0 No    
 USERIDTO                 SYSIBM    BIGINT                       8     0 No    
 SUBJECT                  SYSIBM    VARCHAR                    200     0 Yes   
 FULLMESSAGE              SYSIBM    VARCHAR                    200     0 Yes   
 FULLMESSAGEFORMAT        SYSIBM    SMALLINT                     2     0 Yes   
 FULLMESSAGEHTML          SYSIBM    VARCHAR                    100     0 Yes   
 SMALLMESSAGE             SYSIBM    VARCHAR                    200     0 Yes   
 NOTIFICATION             SYSIBM    SMALLINT                     2     0 Yes   
 CONTEXTURL               SYSIBM    VARCHAR                    200     0 Yes   
 CONTEXTURLNAME           SYSIBM    VARCHAR                    200     0 Yes   
 TIMECREATED              SYSIBM    BIGINT                       8     0 No    

  12 record(s) selected.

还有什么可能导致此错误？

Answer 1

列名中可能有空格。您可以使用此查询来查明是否有任何尾随空格:

db2 "select '<' || name || '>' from sysibm.syscolumns where tbname = 'MDL_MESSAGE'"