如何將2個SELECT連接在一起？

Question

使用PHP和MySQL，並有2個SELECT語句結合在一起

$sql="SELECT DISTINCT t1.* 
     FROM entry AS t1 
     INNER JOIN entry_tag AS t2 ON t1.entry_id=t2.entry_id 
     INNER JOIN tag AS t3 ON t3.tag_id=t2.tag_id 
     WHERE t1.title LIKE '%$key%' OR 
     t1.content LIKE '%$key%' OR 
     t3.tag LIKE '%$key%' AND t1.status='OK' 
     ORDER BY view DESC"; 

---

$sql="SELECT DISTINCT t1.* 
     FROM entry AS t1 
     INNER JOIN candidate AS t2 ON t1.entry_id=t2.entry_id 
     WHERE t2.name LIKE '%$key%' AND t1.status='OK' 
     ORDER BY view DESC"; 

如何將這些2個選擇合併爲1？

Answer 1

使用UNION ALL：

$sql="SELECT DISTINCT t1.* 
    FROM entry AS t1 
    INNER JOIN entry_tag AS t2 ON t1.entry_id=t2.entry_id 
    INNER JOIN tag AS t3 ON t3.tag_id=t2.tag_id 
    WHERE t1.title LIKE '%$key%' OR 
    t1.content LIKE '%$key%' OR 
    t3.tag LIKE '%$key%' AND t1.status='OK' 
    UNION ALL 
    SELECT DISTINCT t1.* 
    FROM entry AS t1 
    INNER JOIN candidate AS t2 ON t1.entry_id=t2.entry_id 
    WHERE t2.name LIKE '%$key%' AND t1.status='OK' 
    ORDER BY view DESC"; 

Answer 2

select * from 
(SELECT DISTINCT t1.* 
    FROM entry AS t1 
    INNER JOIN entry_tag AS t2 ON t1.entry_id=t2.entry_id 
    INNER JOIN tag AS t3 ON t3.tag_id=t2.tag_id 
    WHERE t1.title LIKE '%$key%' OR 
    t1.content LIKE '%$key%' OR 
    t3.tag LIKE '%$key%' AND t1.status='OK' 
    ORDER BY view DESC") 
union all 
("SELECT DISTINCT t1.* 
    FROM entry AS t1 
    INNER JOIN candidate AS t2 ON t1.entry_id=t2.entry_id 
    WHERE t2.name LIKE '%$key%' AND t1.status='OK' 
    ORDER BY view DESC")