Question

我有以下查询，它检索记录列表并从另一个表中获取每条记录的最新阶段。

SELECT leads.lead_id AS id, leads.fields, leads.date, users.name AS introducer, (SELECT lead_stage_id FROM lead_stage_history WHERE lead_stage_history.lead_id=leads.lead_id ORDER BY date_added DESC LIMIT 1) stage FROM leads, users WHERE leads.introducer_id=users.user_id AND leads.account_id=1 ORDER BY date DESC;

我希望限制舞台列返回的值？

我想过滤记录列表，只显示某个阶段的记录。

感谢。

Answer 1

您可以使用having子句在MySQL中执行此操作：

SELECT leads.lead_id AS id, leads.fields, leads.date, users.name AS introducer,
       (SELECT lead_stage_id
        FROM lead_stage_history
        WHERE lead_stage_history.lead_id = leads.lead_id
        ORDER BY date_added DESC
        LIMIT 1
      ) stage
FROM leads join
     users
     on leads.introducer_id=users.user_id
WHERE leads.account_id=1
HAVING stage = 'XXX'
ORDER BY date DESC;

在其他数据库中，您可以

select t.*
from (SELECT leads.lead_id AS id, leads.fields, leads.date, users.name AS introducer,
             (SELECT lead_stage_id
              FROM lead_stage_history
              WHERE lead_stage_history.lead_id = leads.lead_id
              ORDER BY date_added DESC
              LIMIT 1
            ) stage
      FROM leads join
           users
           on leads.introducer_id=users.user_id
      WHERE leads.account_id = 1
     ) t
where stage = 'XXX'
ORDER BY date DESC;

MySQL限制子查询

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