のMySQL：特定の時間枠

Question

上の異なるテーブルからカウント欄私は、次のクエリを持っている：

SELECT SUM(COUNTED) AS TCOUNTED 
    FROM (SELECT COUNTED FROM `clicks`.`t1` 
      UNION ALL 
      SELECT COUNTED FROM `clicks`.`t2` 
      UNION ALL 
      SELECT COUNTED FROM `clicks`.`t3` 
     ) AS TMP 

どこで、どのように私は時間の制約を追加するには？私はそれが特定の日付の間にのみ数えてほしい... MySQLのnoobnessのため申し訳ありません。

ありがとうございます！

Answer 1

SELECT SUM(COUNTED) AS TCOUNTED 
    FROM (SELECT COUNTED FROM `clicks`.`t1` WHERE somedatecol BETWEEN somedate AND somedate 
      UNION ALL 
      SELECT COUNTED FROM `clicks`.`t2` WHERE somedatecol BETWEEN somedate AND somedate 
      UNION ALL 
      SELECT COUNTED FROM `clicks`.`t3` WHERE somedatecol BETWEEN somedate AND somedate 
     ) AS TMP` 

http://dev.mysql.com/doc/refman/5.0/en/select.html

Answer 2

私はあなたの最善の策は、UNION文の前に、各サブ選択内部where句を含めることであると思うだろう。

SELECT SUM(COUNTED) AS TCOUNTED FROM 
(SELECT COUNTED FROM clicks.t1 WHERE <fieldname> BETWEEN '<date1>' AND '<date2>' 
    UNION ALL 
SELECT COUNTED FROM clicks.t2 WHERE <fieldname> BETWEEN '<date1>' AND '<date2>' 
    UNION ALL 
SELECT COUNTED FROM clicks.t3 WHERE <fieldname> BETWEEN '<date1>' AND '<date2>') 
AS TMP; 

もちろん、クエリで達成しようとしているものに関連しています。