Question

我有4张桌子：

艺术家：

id  name
1   Band
2   DJ

流派：

id  artist_id  genre_id
1   1          2
2   1          3
3   2          2

分类

id  artist_id  category_id
1   1          1
2   1          2
3   2          3

价格：

id  artist_id  price  time
1   1          120    60
1   1          400    240

我需要的是使用关键字在名称中搜索类型和类别。我需要最低的价格。

所以当我要求时：

关键字：＆＃34; band＆＃34; 类别：＆＃34; 1＆＃34; 类型：＆＃34; 2＆＃34;

结果应该是：

Band  120

还应按名称或价格订购。

我现在有这个，但是当它们有多个类别或类型时会返回多个艺术家。

SELECT * FROM artists
           LEFT JOIN artists_genres ON artists_genres.artist_id = artists.id 
           LEFT JOIN artists_categories ON artists_categories.artist_id = artists.id 
           LEFT JOIN artists_prices ON artists_prices.artist_id = artists.id 
           WHERE genre_id = $genre AND category_id = $cat AND name LIKE '%$keyword%'

Answer 1

尝试使用Group By：

SELECT * FROM artists
LEFT JOIN artists_genres ON artists_genres.artist_id = artists.id 
LEFT JOIN artists_categories ON artists_categories.artist_id = artists.id 
LEFT JOIN artists_prices ON artists_prices.artist_id = artists.id 
WHERE genre_id = $genre AND category_id = $cat AND name LIKE '%$keyword%'
GROUP BY artists.artists_id

Answer 2

SELECT name,price FROM artists
           LEFT JOIN artists_genres ON artists_genres.artist_id = artists.id 
           LEFT JOIN artists_categories ON artists_categories.artist_id = artists.id 
           LEFT JOIN artists_prices ON artists_prices.artist_id = artists.id 
           WHERE genre_id = $genre AND category_id = $cat AND name LIKE '%$keyword%'
    GROUP BY artists_genres.artist_id ORDER BY name;

这当然会省略某些类别和类型，但可能足以满足您的需求

Answer 3

你需要MIN功能，必须做一个GROUP BY artists.id：

SELECT MIN(artists_prices.price) as lowest_price * FROM artists
       LEFT JOIN artists_genres ON artists_genres.artist_id = artists.id 
       LEFT JOIN artists_categories ON artists_categories.artist_id = artists.id 
       LEFT JOIN artists_prices ON artists_prices.artist_id = artists.id 
       WHERE genre_id = $genre AND category_id = $cat AND name LIKE '%$keyword%'
GROUP BY artists.id

Answer 4

使用订单和限制只获得一条记录：

SELECT name,artists_prices.price FROM artists
LEFT JOIN artists_genres ON artists_genres.artist_id = artists.id 
LEFT JOIN artists_categories ON artists_categories.artist_id = artists.id 
LEFT JOIN artists_prices ON artists_prices.artist_id = artists.id 
WHERE genre_id = $genre AND category_id = $cat AND name LIKE '%$keyword%'
ORDER BY artists_prices.price DESC
LIMIT 1

Mysql搜索多个表并限制为1

4 个答案: