mysql - 如何在MySQL表上进行数据事件搜索

我是MySQL和PHP新手。
我有两张这样的桌子，有上千行。

Table "Company A"
id | Date       | Prize_1   | Prize_2   | Prize_3 | Prize_Consolation
1  | 2011-01-13 | "car"     | "ipad2"   | "bag"   | "mouse"
2  | 2011-02-13 | "ps3"     | "iphone4" | "mouse" | "bag"

Table "Company B"
id | Date       | Prize_1   | Prize_2   | Prize_3 | Prize_Consolation
1  | 2011-01-18 | "tv"      | "iphone4" | "ipod"  | "bag"
2  | 2011-02-13 | "iphone4" | "ipad"    | "bag"   | "mouse"

用户将随机发送查询以搜索“奖品”的历史信息，奖品的发放时间和公司。
示例：我想在两个表上搜索奖品“iphone4”，它应该返回如下结果：

Company   | Date       | Prize
Company A | 2011-02-13 | Prize_2
Company B | 2011-01-18 | Prize_2
Company B | 2011-02-13 | Prize_1

Total 3 prizes for "iphone4"

什么MySQL查询可以实现这种查找搜索？

最佳答案

这些表实际上不应该是两个单独的表，而是一个带有公司标识列的表。
不过，你的情况可以用一种老套的方式解决：

SELECT
  'Company A' AS Company,
  Date,
  CASE
    WHEN Prize_1 = 'iphone4' THEN 'Prize_1'
    WHEN Prize_2 = 'iphone4' THEN 'Prize_2'
    WHEN Prize_3 = 'iphone4' THEN 'Prize_3'
    WHEN Prize_Consolation = 'iphone4' THEN 'Prize_Consolation'
    ELSE NULL
  END AS Prize
FROM `Company A`
WHERE
  Prize_1 = 'iphone4'
  OR Prize_2 = 'iphone4'
  OR Prize_3 = 'iphone4'
  OR Prize_Consolation = 'iphone4'
/* UNION performs the same query against both tables and combine the results */
UNION
SELECT
  'Company B' AS Company,
  Date,
  CASE
    WHEN Prize_1 = 'iphone4' THEN 'Prize_1'
    WHEN Prize_2 = 'iphone4' THEN 'Prize_2'
    WHEN Prize_3 = 'iphone4' THEN 'Prize_3'
    WHEN Prize_Consolation = 'iphone4' THEN 'Prize_Consolation'
    ELSE NULL
  END AS Prize

从Company B
其中
Prize_1='iphone4'
或Prize_2='iphone4'
或Prize_3='iphone4'
或Prize_安慰='iphone4'
这种设计更合适的表格布局如下：

Table Prizes
---------------
id INT AUTO_INCREMENT,
Date DATETIME,
Company VARCHAR(256),
Prize_Type INT,
Prize_Item VARCHAR(256)

Table Prize_Types
---------------
Prize_Type INT AUTO_INCREMENT PRIMARY KEY,
Prize_Description VARCHAR(32)

奖品

1 | 2012-01-28 08:00:00 | 'Company A' | 3 | 'some prize'
2 | 2012-01-28 08:00:00 | 'Company A' | 2 | 'ipad'
3 | 2012-01-28 08:00:00 | 'Company A' | 1 | 'junky phone'
4 | 2012-01-28 08:00:00 | 'Company b' | 4 | 'iphone4'

奖品类型

1 | 'Prize 1'
2 | 'Prize 2'
3 | 'Prize 3'
4 | 'Consolation Prize'

将其查询为：

SELECT
  Company,
  Date,
  Prize_Item,
  Prize_Description
FROM Prizes JOIN Prize_Types ON Prize_Types.Prize_Type = Prizes.Prize_Type
WHERE Prize_Item = 'iphone4'

实际上，您可能还希望公司和奖品规范化为自己的表，就像奖品类型一样。