Question

我的服务器中有很多表，它们是日期的名称。例 e_20150916，e_20150917，e_20150918，e_20150919 .....等

当用户在我的输入类型中添加日期时，我想做这个表......例如，当他想要2015/08/1到2015/08/15之间的总摘要时。请帮我解决这些问题。

我正在使用2个表合并。

这里是我对2个表的查询

SELECT  e.cus,e.cusname,
        e.gid,
        SUM(total)
FROM ( 
    SELECT
        e.cus,
        e.cusname,
        e.gid,
        ROUND(SUM(TIMEDIFF(FROM_UNIXTIME(stoptime / 1000),
                        FROM_UNIXTIME(starttime / 1000))) / 60, 4) as total
    FROM
        e_cdr_$table
    WHERE e.cusname LIKE '%$customername%'
        UNION ALL
        SELECT
        e.cus,
        e.cusname,
        e.gid,
        ROUND(SUM(TIMEDIFF(FROM_UNIXTIME(stoptime / 1000),
                        FROM_UNIXTIME(starttime / 1000))) / 60, 4) as total
    FROM                                
        e_cdr_$table1
    WHERE e.cusname LIKE '%$customername%'
) s

我需要对7个表进行此查询。我该怎么办？

Answer 1

正如之前的评论所指出的那样，每个日期都有一个单独的表格，这不是最聪明的方法，但如果你需要和你一起生活的情况至少可以做到UNION ALL在子查询中执行操作，然后使用单个SUM子句执行实际选择和WHERE - magic：

SELECT  cus,cusname,gid,
        ROUND(SUM(TIMEDIFF(FROM_UNIXTIME(stoptime / 1000),
                    FROM_UNIXTIME(starttime / 1000))) / 60, 4) as total
FROM ( 
  SELECT * FROM e_20150916 UNION ALL
  SELECT * FROM e_20150917 UNION ALL
  SELECT * FROM e_20150918 UNION ALL
  SELECT * FROM e_20150919 UNION ALL
  SELECT * FROM e_20150920 UNION ALL
  SELECT * FROM e_20150921 UNION ALL
  SELECT * FROM e_20150922 ) tbls
WHERE cusname LIKE '%$customername%'
GROUP BY cus,cusname,gid

我不确定性能问题。如果结果表明您的表格过于庞大，那么您当然可以通过以下方式单独限制其范围：

SELECT  cus,cusname,gid,
        ROUND(SUM(TIMEDIFF(FROM_UNIXTIME(stoptime / 1000),
                    FROM_UNIXTIME(starttime / 1000))) / 60, 4) as total
FROM ( 
  SELECT * FROM e_20150916 WHERE cusname LIKE '%$customername%' UNION ALL
  SELECT * FROM e_20150917 WHERE cusname LIKE '%$customername%' UNION ALL
  SELECT * FROM e_20150918 WHERE cusname LIKE '%$customername%' UNION ALL
  SELECT * FROM e_20150919 WHERE cusname LIKE '%$customername%' UNION ALL
  SELECT * FROM e_20150920 WHERE cusname LIKE '%$customername%' UNION ALL
  SELECT * FROM e_20150921 WHERE cusname LIKE '%$customername%' UNION ALL
  SELECT * FROM e_20150922 WHERE cusname LIKE '%$customername%') tbls
GROUP BY cus,cusname,gid

多个表在mysql中组合

1 个答案: