mysql - 错误 1052：where 子句中的列 'metric_name' 不明确

Question

SELECT b.target_host                              AS 'host',
       a.target_ip                                AS 'Target',
       a.monitor_type                             AS 'Type Monitor',
       Concat (a.metric_name, "", a.metric_value) AS "metric name value"
FROM   pm_sis_raw_metrics AS a
       INNER JOIN pm_sis_hs_metrics AS b
               ON a.id = b.id
WHERE  metric_value > 80
       AND ( metric_name = "utilization"
              OR metric_name = "physical memory used %"
              OR metric_name = "disk/file system/[c]/percent full"
              OR metric_name = "% packets good" )  

错误 1052：where 子句中的列 'metric_name' 不明确

Answer 1

您必须在 where cause 中使用列名（如 a.metric_name）指定表别名。