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³ç³»ï¼ä»è¿äºè¡¨ä¸æ¥è¯¢æ°æ®ãjoiné常æä¸é¢å ç§ç±»åï¼ä¸åç±»åçjoinæä½ä¼å½±åè¿åçæ°æ®ç»æã
- **INNER JOIN**: çåäº JOINï¼é»è®¤çJOINç±»åï¼,å¦æ表ä¸æè³å°ä¸ä¸ªå¹é
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- **LEFT JOIN**: å³ä½¿å³è¡¨ä¸æ²¡æå¹é
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- **RIGHT JOIN**: å³ä½¿å·¦è¡¨ä¸æ²¡æå¹é
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## 说æ
~~~
join ( mixed join [, mixed $condition = null [, string $type = 'INNER']] )
leftJoin ( mixed join [, mixed $condition = null ] )
rightJoin ( mixed join [, mixed $condition = null ] )
fullJoin ( mixed join [, mixed $condition = null ] )
~~~
**åæ°**
### join
è¦å
³èçï¼å®æ´ï¼è¡¨å以åå«å
æ¯æçåæ³ï¼
* åæ³1ï¼[ 'å®æ´è¡¨åæè
åæ¥è¯¢'=>'å«å' ]
* åæ³2ï¼'ä¸å¸¦æ°æ®è¡¨åç¼ç表å'ï¼èªå¨ä½ä¸ºå«åï¼
* åæ³2ï¼'ä¸å¸¦æ°æ®è¡¨åç¼ç表å å«å'
### condition
å
³èæ¡ä»¶ï¼åªè½æ¯å符串ã
### type
å
³èç±»åãå¯ä»¥ä¸º:`INNER`ã`LEFT`ã`RIGHT`ã`FULL`ï¼ä¸åºå大å°åï¼é»è®¤ä¸º`INNER`ã
**è¿åå¼**
模å对象
## 举ä¾
~~~
Db::table('think_artist')
->alias('a')
->join('work w','a.id = w.artist_id')
->join('card c','a.card_id = c.id')
->select();
~~~
~~~
Db::table('think_user')
->alias('a')
->join(['think_work'=>'w'],'a.id=w.artist_id')
->join(['think_card'=>'c'],'a.card_id=c.id')
->select();
~~~
é»è®¤éç¨INNER JOIN æ¹å¼ï¼å¦æéè¦ç¨å
¶ä»çJOINæ¹å¼ï¼å¯ä»¥æ¹æ
~~~
Db::table('think_user')
->alias('a')
->leftJoin('word w','a.id = w.artist_id')
->select();
~~~
表åä¹å¯ä»¥æ¯ä¸ä¸ªåæ¥è¯¢
~~~
$subsql = Db::table('think_work')
->where('status',1)
->field('artist_id,count(id) count')
->group('artist_id')
->buildSql();
Db::table('think_user')
->alias('a')
->join([$subsql=> 'w'], 'a.artist_id = w.artist_id')
->select();
~~~
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