php - mysql 两表三列依赖查询

Question

我需要做的是获取与“starName”相对应的所有“日期”的列表。我已经连接了两个表，但我不知道如何在连接的表中搜索“starName”。

这是我到目前为止的查询:

SELECT date,
       COUNT(*) 
  FROM Scans, 
       Targets 
 WHERE Scans.idTarget = Targets.id 
 GROUP BY date;

这是我的表格:

    Targets
    | id | starName | more columns.... |
    -----------------
    | 1  | WHITE    |
    | 2  | IOT CAS  |
    | 3  | 21 ALP   |

    Scans
    | date | idTarget | more columns.... |
    -------------------
    | 1-1  | 1        |
    | 3-6  | 3        |
    | 11-1 | 2        |

感谢您的帮助。

Answer 1

SELECT date,COUNT(*) 
FROM Scans, Targets 
WHERE Scans.idTarget = Targets.id 
AND targets.starName like '%21%'  --This is the line you need or something like it
GROUP BY date;