mysql select distinct clause

Question

我有這張表，我想選擇所有不同的user_id值，其中既有事件='AAAAAAAAAA'和事件='XXXXXXXXXX'（即只有結果應該是user_id = 123456789）

unique_row_id user_id   event  event_timestamp 
---------------------------------------------------------------- 
0    123456789  AAAAAAAAAA 2010-01-20 15:00:00 
1    123456789  abcdefghij 2010-01-20 15:00:05 
2    123456789  XXXXXXXXXX 2010-01-20 15:00:15 
3    987654321  AAAAAAAAAA 2010-01-20 16:00:00 
4    987654321  abcdefghij 2010-01-20 16:00:05 
5    987654321  abcdefghij 2010-01-20 16:00:15 
6    111111111  XXXXXXXXXX 2010-01-20 16:01:00 
7    111111111  XXXXXXXXXX 2010-01-20 16:01:05 
8    111111111  XXXXXXXXXX 2010-01-20 16:01:15 

我都試過：

SELECT distinct user_id from mydata where event='AAAAAAAAAA' and event='XXXXXXXXXX' 

這給了我一個空的結果集，

SELECT distinct user_id from mydata where event='AAAAAAAAAA' or event='XXXXXXXXXX' 

這給了我一切。任何建議 - 我猜我需要沿着'加入'的路走下去嗎？

Answer 1

試試這個：

select user_id from mydata where event='AAAAAAAAAAA' 
union 
select user_id from mydata where event='XXXXXXXXXXX'; 

這將選擇兩個列表（用戶瓦特/ AAA，用戶瓦特/ XXX），然後合併在一起，去除重複行。

希望有幫助！

謝謝， 喬

Answer 2

我會用一個子查詢做到這一點：

select distinct user_id 
from mydata m 
where event = 'AAAAAAAAAA' 
and exists (
    select 1 
    from mydata 
    where user_id = m.user_id 
    and event = 'XXXXXXXXXX' 
); 

Answer 3

的條件在WHERE子句只適用於在同一時間單行。 爲了檢查兩行，你必須使用JOIN：

SELECT distinct a.user_id 
FROM mydata a, mydata b 
WHERE a.event='AAAAAAAAAA' AND b.event='XXXXXXXXXX' AND a.user_id = b.user_id 

如果你知道一個事件只能出現每個用戶一次，就可以使用GROUP BY：

SELECT user_id 
FROM mydata 
WHERE event in ('AAAAAAAAAA', 'XXXXXXXXXX') 
GROUP BY user_id 
HAVING count(user_id)=2 

Answer 4

SELECT 
    DISTINCT user_id 
FROM 
    my_table AS outer_table 
WHERE 
    EXISTS (
     SELECT 
      1 
     FROM 
      my_table AS inner_table_A 
     WHERE 
      inner_table_A.user_id = outer_table.user_id AND 
      inner_table_A.event = 'AAAAAAAAAA' 
    ) AND 
    EXISTS (
     SELECT 
      1 
     FROM 
      my_table AS inner_table_B 
     WHERE 
      inner_table_B.user_id = outer_table.user_id AND 
      inner_table_B.event = 'XXXXXXXXXX' 
    ) 

Answer 5

我會用這樣的東西...

SET @events := 'AAAAAAAAAA,XXXXXXXXXX'; 

SELECT user_id 
FROM mydata 
GROUP BY user_id 
HAVING GROUP_CONCAT(DISTINCT event ORDER BY event SEPARATOR ',') = @events;