Mysql 我个人喜欢找出创建表模式和显示中的索引。我们真正喜欢的是在这样一行上写出所有内容。我个人喜欢找出创建表模式和显示中的索引。我们真正喜欢的是当你把它全部写在一行上。我个人喜欢从中找出创建表模式和显示索引。我们真正喜欢的是当你把它全部写在一行上时。我个人喜欢从

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我个人喜欢找出

创建表

模式和

显示

中的索引。我们真正喜欢的是在这样一行上写出所有内容。我个人喜欢找出

创建表

模式和

显示

中的索引。我们真正喜欢的是当你把它全部写在一行上。我个人喜欢从中找出

创建表

模式和

显示索引。我们真正喜欢的是当你把它全部写在一行上时。我个人喜欢从

中找出

创建表

模式和

显示索引。谢谢，那加快了一点。谢谢，那加快了一点。谢谢，那加快了一点。谢谢，那加快了一点。
SELECT *,
       DATE_FORMAT(tbl1.pub, '%m/%d/%Y') AS pub_a,
       CONCAT(tbl1.code1, tbl1.code2) AS code_a
FROM (tbl1
      INNER JOIN tbl2 ON tbl1.pkid=tbl2.fkid
      LEFT JOIN tbl3 ON tbl1.pkid=tbl3.fkid)
LEFT JOIN tbl4 ON tbl1.person=tbl4.code OR tbl3.person=tbl4.code
WHERE tbl1.subcat != ''
  AND tbl1.pub < '2014-01-15 13:20:23'
  AND tbl1.exp > '2014-01-15 13:20:23'
ORDER BY tbl1.pub DESC 
LIMIT 0, 50

left join tbl4 on tbl1.person = tbl4.code
    or tbl3.person = tbl4.code

left join tbl4 on tbl4.code in (tbl1.person, tbl3.person)

select *
from ((SELECT *,
              DATE_FORMAT(tbl1.pub, '%m/%d/%Y') AS pub_a,
              CONCAT(tbl1.code1, tbl1.code2) AS code_a
        FROM (tbl1
              INNER JOIN tbl2 ON tbl1.pkid=tbl2.fkid
              LEFT JOIN tbl3 ON tbl1.pkid=tbl3.fkid
              )
              LEFT JOIN tbl4 ON tbl3.person=tbl4.code
        WHERE tbl1.subcat != ''
          AND tbl1.pub < '2014-01-15 13:20:23'
          AND tbl1.exp > '2014-01-15 13:20:23'
        ORDER BY tbl1.pub DESC 
        LIMIT 0, 50
       ) union
       (SELECT *,
              DATE_FORMAT(tbl1.pub, '%m/%d/%Y') AS pub_a,
              CONCAT(tbl1.code1, tbl1.code2) AS code_a
        FROM (tbl1
              INNER JOIN tbl2 ON tbl1.pkid=tbl2.fkid
              LEFT JOIN tbl3 ON tbl1.pkid=tbl3.fkid
              )
              LEFT JOIN tbl4 ON tbl1.person=tbl4.code
        WHERE tbl1.subcat != ''
          AND tbl1.pub < '2014-01-15 13:20:23'
          AND tbl1.exp > '2014-01-15 13:20:23'
        ORDER BY tbl1.pub DESC 
        LIMIT 0, 50
       )
      ) t
order by pub desc
limit 0, 50