sql - PostgreSQL 使用内部连接删除

Question

DELETE B.* 
FROM   m_productprice B  
       INNER JOIN m_product C ON B.m_product_id = C.m_product_id 
WHERE  C.upc = '7094' AND B.m_pricelist_version_id = '1000020'

我收到以下错误 PostgreSQL 8.2.11

ERROR:  syntax error at or near "B"
LINE 1: DELETE B.* from m_productprice B  INNER JOIN m_product C ON ...

我试着给

DELETE B from m_productprice B  INNER JOIN m_product C ON B....
 ERROR:  syntax error at or near "B"

我试着给

ERROR:  syntax error at or near "INNER"
LINE 1: DELETE from m_productprice B  INNER JOIN m_product C ON B.m_...

我的查询有什么问题？

Answer 1

DELETE 
FROM m_productprice B  
     USING m_product C 
WHERE B.m_product_id = C.m_product_id AND
      C.upc = '7094' AND                 
      B.m_pricelist_version_id='1000020';

或者

DELETE 
FROM m_productprice
WHERE m_pricelist_version_id='1000020' AND 
      m_product_id IN (SELECT m_product_id 
                       FROM m_product 
                       WHERE upc = '7094'); 

Answer 2

这对我有用：

DELETE from m_productprice
WHERE  m_pricelist_version_id='1000020'
       AND m_product_id IN (SELECT m_product_id
                            FROM   m_product
                            WHERE  upc = '7094'); 

Answer 3

如果您有多个联接，则可以使用逗号分隔的 USING 语句：

DELETE 
FROM 
      AAA AS a 
USING 
      BBB AS b,
      CCC AS c
WHERE 
      a.id = b.id 
  AND a.id = c.id
  AND a.uid = 12345 
  AND c.gid = 's434sd4'

参考

Answer 4

另一种适用于 Postgres 9.1+ 的形式是将公用表表达式与用于连接的 USING 语句相结合。

WITH prod AS (select m_product_id, upc from m_product where upc='7094')
DELETE FROM m_productprice B
USING prod C
WHERE B.m_product_id = C.m_product_id 
AND B.m_pricelist_version_id = '1000020';

Answer 5

只需使用带有 INNER JOIN、LEFT JOIN 或其他的子查询：

DELETE FROM m_productprice
WHERE m_product_id IN
(
  SELECT B.m_product_id
  FROM   m_productprice  B
    INNER JOIN m_product C 
    ON   B.m_product_id = C.m_product_id
  WHERE  C.upc = '7094' 
  AND    B.m_pricelist_version_id = '1000020'
)

优化查询，

• 使用NOT EXISTS代替IN
• 和WITH用于大型子查询