檢查是否存在另一個表中的記錄

Question

• 任務; id
• task_assign; id，task_id
• task_state; id，assign_id
• states; ID，STATE_ID，在其他表

  SELECT DISTINCT t.id,t.* FROM tasks AS t 
  INNER JOIN task_assign AS ta1 ON ta1.task_id=t.id 
  INNER JOIN task_state AS ts1 ON ts1.assign_id=ta1.id 
  INNER JOIN states AS s1 ON s1.id=ts1.state_id AND s1.define_id=14 
  INNER JOIN task_assign AS ta2 ON ta2.task_id=t.id 
  INNER JOIN task_state AS ts2 ON ts2.assign_id=ta2.id 
  INNER JOIN states AS s2 ON s2.id=ts2.state_id AND s2.define_id=21 
  . 
  . 
  . 
  INNER JOIN task_assign AS ta5 ON ta5.task_id=t.id 
  INNER JOIN task_state AS ts5 ON ts5.assign_id=ta5.id 
  INNER JOIN states AS s5 ON s5.id=ts5.state_id AND s5.define_id=25 
  

  這個作品define_id

我要包含在選定的ID，但乘以請求時，它放緩。有另一種方法嗎？

Answer 1

SELECT 
    t.id 
FROM 
    tasks t 
INNER JOIN 
    task_assign ta1 
    ON ta1.task_id = t.id 
INNER JOIN 
    task_state ts1 
    ON ts1.assign_id = ta1.id 
INNER JOIN 
    states s1 
    ON s1.id = ts1.state_id 
    AND s1.define_id IN (14,25) 
GROUP BY 
    t.id 
HAVING 
    COUNT(DISTINCT s1.define_id) = 2 

編輯 - 解釋到OP這是什麼呢？ 這首先會檢索所有記錄中，其中define_id是14或25，但HAVING子句將只允許查詢返回那些誰都。