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具有多个字段和字段选择的PHP / MYSQL Distinct运算符

[英]PHP/MYSQL Distinct operator with multiple fields and field selection

原文 2017-11-22 03:37:07 0 2 php/ mysql

I have a MYSQL table that looks like: +----+--------------+------------+----------------+---------------------+ | id | id_solicitud | id_estatus | id_responsable | fecha_hora | +----+--------------+------------+----------------+---------------------+ | 1 | 1 | 1 | 3 | 2017-11-20 11:12:05 | | 3 | 1 | 2 | 3 | 2017-11-20 13:30:50 | | 4 | 2 | 1 | 5 | 2017-11-20 13:42:35 | | 5 | 2 | 2 | 5 | 2017-11-20 13:52:25 | | 6 | 1 | 4 | 2 | 2017-11-21 12:20:17 | | 8 | 2 | 3 | 2 | 2017-11-21 13:39:57 | | 9 | 2 | 2 | 5 | 2017-11-21 13:40:55 | | 10 | 2 | 4 | 2 | 2017-11-21 13:45:24 | +----+--------------+------------+----------------+---------------------+ 我有一个MYSQL表，看起来像： +----+--------------+------------+----------------+---------------------+ | id | id_solicitud | id_estatus | id_responsable | fecha_hora | +----+--------------+------------+----------------+---------------------+ | 1 | 1 | 1 | 3 | 2017-11-20 11:12:05 | | 3 | 1 | 2 | 3 | 2017-11-20 13:30:50 | | 4 | 2 | 1 | 5 | 2017-11-20 13:42:35 | | 5 | 2 | 2 | 5 | 2017-11-20 13:52:25 | | 6 | 1 | 4 | 2 | 2017-11-21 12:20:17 | | 8 | 2 | 3 | 2 | 2017-11-21 13:39:57 | | 9 | 2 | 2 | 5 | 2017-11-21 13:40:55 | | 10 | 2 | 4 | 2 | 2017-11-21 13:45:24 | +----+--------------+------------+----------------+---------------------+ +----+--------------+------------+----------------+---------------------+ | id | id_solicitud | id_estatus | id_responsable | fecha_hora | +----+--------------+------------+----------------+---------------------+ | 1 | 1 | 1 | 3 | 2017-11-20 11:12:05 | | 3 | 1 | 2 | 3 | 2017-11-20 13:30:50 | | 4 | 2 | 1 | 5 | 2017-11-20 13:42:35 | | 5 | 2 | 2 | 5 | 2017-11-20 13:52:25 | | 6 | 1 | 4 | 2 | 2017-11-21 12:20:17 | | 8 | 2 | 3 | 2 | 2017-11-21 13:39:57 | | 9 | 2 | 2 | 5 | 2017-11-21 13:40:55 | | 10 | 2 | 4 | 2 | 2017-11-21 13:45:24 | +----+--------------+------------+----------------+---------------------+

Then, I proceed to filter by the id_solicitud field with the following Mysql QUERY: 然后，我继续使用以下Mysql QUERY按id_solicitud字段进行过滤：

SELECT id_estatus, id_responsable, fecha_hora FROM estatus_historico WHERE id_solicitud =2 ORDER BY fecha_hora 从estatus_historico处选择id_estatus，id_responsable，fecha_hora id_solicitud = 2按fecha_hora排序

The result: +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 2 | 5 | 2017-11-20 13:52:25 | | 3 | 2 | 2017-11-21 13:39:57 | | 2 | 5 | 2017-11-21 13:40:55 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+ 结果： +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 2 | 5 | 2017-11-20 13:52:25 | | 3 | 2 | 2017-11-21 13:39:57 | | 2 | 5 | 2017-11-21 13:40:55 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+ +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 2 | 5 | 2017-11-20 13:52:25 | | 3 | 2 | 2017-11-21 13:39:57 | | 2 | 5 | 2017-11-21 13:40:55 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+

I want to apply the distinct operator over id_estatus column but selecting the older row when duplicate rows are found, ie my desired result is: +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 3 | 2 | 2017-11-21 13:39:57 | | 2 | 5 | 2017-11-21 13:40:55 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+ 我想对id_estatus列应用唯一的运算符，但是当发现重复的行时选择较旧的行，即我想要的结果是： +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 3 | 2 | 2017-11-21 13:39:57 | | 2 | 5 | 2017-11-21 13:40:55 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+ +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 3 | 2 | 2017-11-21 13:39:57 | | 2 | 5 | 2017-11-21 13:40:55 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+

I tried: 我试过了：

SELECT id_estatus, id_responsable, fecha_hora FROM estatus_historico WHERE id_solicitud =2 GROUP BY id_estatus ORDER BY fecha_hora 从estatus_historico中选择id_estatus，id_responsable，fecha_hora id_solicitud = 2 GROUP BY id_estatus ORDER BY fecha_hora

But the result is wrong: +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 2 | 5 | 2017-11-20 13:52:25 | | 3 | 2 | 2017-11-21 13:39:57 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+ 但是结果是错误的： +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 2 | 5 | 2017-11-20 13:52:25 | | 3 | 2 | 2017-11-21 13:39:57 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+ +------------+----------------+---------------------+ | id_estatus | id_responsable | fecha_hora | +------------+----------------+---------------------+ | 1 | 5 | 2017-11-20 13:42:35 | | 2 | 5 | 2017-11-20 13:52:25 | | 3 | 2 | 2017-11-21 13:39:57 | | 4 | 2 | 2017-11-21 13:45:24 | +------------+----------------+---------------------+

Any help would be much appreciated 任何帮助将非常感激

UPDATE: Files to create table and insert data => estatus_historico.sql 更新：用于创建表和插入数据的文件=> estatus_historico.sql

2 个解决方案

try this one 试试这个

SELECT id_estatus, id_responsable, MAX(fecha_hora) FROM estatus_historico WHERE id_solicitud =2 GROUP BY id_estatus ORDER BY fecha_hora

多亏了Rahul Shrivastava ，我终于找到了正确的答案：

SELECT * FROM ( SELECT id_estatus, id_responsable, MAX( fecha_hora ) AS fecha FROM estatus_historico WHERE id_solicitud =2 GROUP BY id_estatus ORDER BY fecha_hora ) AS MY_TABLE ORDER BY fecha