LEFT JOIN和重複的結果

Question

我有一個SQL語句如下：

SELECT s.sp_id,s.synopsis,s.logline,s.user_id,s.bin_status,s.sp_order,s.sp_down_count,s.sp_name, 
      `users`.firstname as `firstname`,`users`.lastname as `lastname`,s.status, 
      `users`.email as `email`,`users`.phone as `phone`,`users`.address1 as `address1`, 
      `users`.address2 as `address2`,`users`.`r_group`, view_coverages.grade,coverages.comments 

    FROM s 
    LEFT JOIN `users` ON `users`.user_id=s.user_id 
    LEFT JOIN view_coverages ON view_coverages.sp_id=s.sp_id 
    LEFT JOIN `coverages` ON `coverages`.sp_id=s.sp_id 

    WHERE $email_filter lower(s.synopsis) like '%$search_word_fix%' 
    OR lower(s.sp_name) like '%$search_word_fix%' 
    OR lower(s.logline) like '%$search_word_fix%' 
    OR lower(coverages.comments) like '% $search_word_fix %' 
    ORDER BY view_coverages.grade DESC 

當我顯示結果我得到了很多重複的。 我想顯示s.sp_name不重複的搜索結果。

Answer 1

你有兩個選擇：

1. 只選擇唯一的，不重複的，通過改變你的SELECT到SELECT DISTINCT結果。
2. GROUP BY s.sp_name但您需要在所有您選擇的其他字段上執行聚合函數。

由於我確定您無法對某人的姓名，地址，電話號碼等進行平均或累計，您應該嘗試選項1（SELECT DISTINCT）。如果您在其他重複行中有非唯一字段，則除了唯一字段外，您需要每個字段GROUP BY;在剩餘的唯一字段上使用集合函數（即，SUM，AVG等）。

Answer 2

泰這樣的：

SELECT s.sp_id,s.synopsis,s.logline,s.user_id,s.bin_status,s.sp_order,s.sp_down_count,s.sp_name, 
      `users`.firstname as `firstname`,`users`.lastname as `lastname`,s.status, 
      `users`.email as `email`,`users`.phone as `phone`,`users`.address1 as `address1`, 
      `users`.address2 as `address2`,`users`.`r_group`, view_coverages.grade,coverages.comments 

    FROM s 
    LEFT JOIN `users` ON `users`.user_id=s.user_id 
    LEFT JOIN view_coverages ON view_coverages.sp_id=s.sp_id 
    LEFT JOIN `coverages` ON `coverages`.sp_id=s.sp_id 

    WHERE $email_filter lower(s.synopsis) like '%$search_word_fix%' 
    OR lower(s.sp_name) like '%$search_word_fix%' 
    OR lower(s.logline) like '%$search_word_fix%' 
    OR lower(coverages.comments) like '% $search_word_fix %' 
    ADD --->  group by s.sp_name 
    ORDER BY view_coverages.grade DESC