如何在其他表和计数中匹配

Question

我有两张桌子 areas2013

row_id | area              |teamleader
1      |  1234-Asia        |   Joe 
2      |  12345-Europe     |   Juan  
3      | 123456-UK         |   Ple 

和 F12

row_id| eacode
1     | 1234
2     | 12345
3     | 1234

正如你所看到的，我希望使用类似％匹配eacode和区域并计算多少eacode。

我想在php中使用这样的东西

eacode| area | count | teamleader 
1234  | Asia  |   2    |  Joe
12345 | Europe|   1    |  Juan

抱歉我的英文不好

Answer 1

SELECT eacode, substr(area, locate('-', area) + 1) area, count(*) `count`, teamleader
FROM f12
JOIN areas2013 ON area like CONCAT(eacode, '-%')
GROUP BY eacode

Answer 2

Barmar的答案很好我只是稍微调整了一下以获得您所要求的确切输出：

SELECT eacode, SUBSTRING_INDEX(SUBSTRING_INDEX(area, '-', 2), '-', -1) as area, count(*) `count`, teamleader
FROM f12
JOIN areas2013 ON area like CONCAT(eacode, '-%')
GROUP BY eacode