使用联接和条件选择MYSQL动态表名称

Question

If I have this schema

• lists ( lead_id , list_id, campaign_id, ...)
• campaign (campaign_id, ...)
• custom_list_id (lead_id, ...)

there are many tables with name custom_ list_id for various list_id s and I want to:

SELECT * from lists ls inner join campaign c ON c.id=ls.campaign_id
inner join custom_"@LISTID" cll ON ls.lead_id = cll.lead_id

How do I write this query? thnx

Answer 1

Not sure what sql you really want, but try this:

SET @sql = NULL;
SELECT
  GROUP_CONCAT(DISTINCT
    CONCAT(
      'INNER JOIN custom_',  list_id, 'cll', list_id, ' ON ls.lead_id = cll', list_id '.lead_id')
    )
    SEPARATOR ' '
  ) INTO @sql
FROM lists ;
SET @sql = CONCAT('SELECT * from lists ls inner join campaign c ON c.id=ls.campaign_id ', @sql);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;