你好,我正试图使用这个查询运行这个选择语句,它需要2个多小时才能运行。我已经设置了所有的指标是正确的。但它仍然需要永远是有东西我错过了或一个更有效的方式连接表在一起,将加快这个查询?
我为所有连接在一起的项目设置了索引,它们具有相同的长度和数据类型。
SELECT
p.sap_article_id,
p.numeric_line_code,
p.uag_linecode,
p.uag_partnum,
p.part_description,
p.jobber_price,
p.jobber_core,
p.discount1,
p.discount2,
p.uom,
p.product_category,
w.as400_warehouse,
w.atp_qty,
p.updated,
t.regular_discount
FROM part p
LEFT JOIN tabjbmaw t ON t.accountnum = '73050'
AND p.numeric_line_code = t.numeric_line_code
AND p.sub_code = t.sub_code
JOIN warehouse w ON w.sap_article_id = p.sap_article_id;
+----+-------------+-----------+------+--------------------------------------------------+-----------------------+---------+----------------------------------+--------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-----------+------+--------------------------------------------------+-----------------------+---------+----------------------------------+--------+-------------+
| 1 | SIMPLE | part | ALL | PRIMARY,sap_article,part_sap_article_id_fk | NULL | NULL | NULL | 389309 | |
| 1 | SIMPLE | warehouse | ref | article | article | 130 | inventory.part.sap_article_id | 5 | Using where |
| 1 | SIMPLE | tabjbmaw | ref | numeric_line_code_idx,subcode_idx,accountnum_idx | numeric_line_code_idx | 5 | inventory.part.numeric_line_code | 19 | |
+----+-------------+-----------+------+--------------------------------------------------+-----------------------+---------+----------------------------------+--------+-------------+
谢谢你的帮助
+-----------------------------+--------------+------+-----+---------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------------+--------------+------+-----+---------------------+-----------------------------+
| sap_article_id | varchar(24) | NO | PRI | | |
| sap_brand_id | varchar(20) | NO | | NULL | |
| uag_partnum | varchar(20) | NO | MUL | NULL | |
| uag_linecode | varchar(5) | NO | MUL | NULL | |
| cag_partnum | varchar(20) | NO | MUL | NULL | |
| cag_linecode | varchar(5) | NO | | NULL | |
| product_category_legacy | varchar(20) | NO | | NULL | |
| part_description | varchar(128) | NO | | NULL | |
| abc_indicator | varchar(8) | NO | | NULL | |
| pack_code | varchar(8) | NO | | NULL | |
| case_qty | int(11) | NO | | NULL | |
| per_car_qty | int(11) | NO | | NULL | |
| uom | varchar(6) | NO | | NULL | |
| upc_code | varchar(128) | NO | | NULL | |
| jobber_price | float(14,4) | YES | | NULL | |
| jobber_core | float(14,4) | YES | | NULL | |
| date_last_price_change | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| weight | float(14,4) | YES | | NULL | |
| weight_unit | varchar(6) | NO | | NULL | |
| dimension_type | varchar(6) | NO | | NULL | |
| length | float(14,4) | YES | | NULL | |
| width | float(14,4) | YES | | NULL | |
| height | float(14,4) | YES | | NULL | |
| updated | tinyint(1) | NO | | 0 | |
| superseded_sap_article_id | varchar(24) | YES | | NULL | |
| last_updated | timestamp | NO | | 0000-00-00 00:00:00 | |
| hour_updated | int(11) | YES | | NULL | |
| discount1 | float | YES | | NULL | |
| discount2 | float | YES | | NULL | |
| product_category | varchar(3) | YES | | NULL | |
| superseded_part_number | varchar(20) | YES | | NULL | |
| sub_code | varchar(3) | YES | MUL | NULL | |
| date_effective_price_change | date | YES | | NULL | |
| numeric_line_code | varchar(3) | YES | MUL | NULL | |
| list | float | YES | | NULL | |
+-----------------------------+--------------+------+-----+---------------------+-----------------------------+
我已经为所有连接在一起的项设置了索引
是的,但是我从索引的名称中猜测每个索引只有一个字段。
让我们看一下描述中的几列。
| table | possible_keys | key
+-----------+--------------------------------------------------+----------------
| part | PRIMARY,sap_article,part_sap_article_id_fk | NULL
| warehouse | article | article
| tabjbmaw | numeric_line_code_idx,subcode_idx,accountnum_idx | numeric_line_code_idx
它可以为numeric_line_code, subcode和accountnum使用索引,但是只有三个索引每个包含一个字段,没有索引包含所有字段。您正在让优化器选择一个字段索引,而不是为所有三个字段提供一个可以使用的索引。
在表tabjbmaw上添加一个索引,包含三个字段numeric_line_code、subcode和accountnum
扩展@Sebas的答案,您应该首先选择tabjbmaw:
SELECT
p.sap_article_id,
p.numeric_line_code,
p.uag_linecode,
p.uag_partnum,
p.part_description,
p.jobber_price,
p.jobber_core,
p.discount1,
p.discount2,
p.uom,
p.product_category,
w.as400_warehouse,
w.atp_qty,
p.updated,
t.regular_discount
FROM tabjbmaw t
LEFT JOIN parts p ON p.numeric_line_code = t.numeric_line_code
AND p.sub_code = t.sub_code
JOIN warehouse w ON w.sap_article_id = p.sap_article_id
WHERE t.accountnum = '73050'
;
您可以尝试将Left Join作为Subselect放入SELECT部分。那"可能"会加快一点速度。
:
SELECT
p.sap_article_id,
p.numeric_line_code,
p.uag_linecode,
p.uag_partnum,
p.part_description,
p.jobber_price,
p.jobber_core,
p.discount1,
p.discount2,
p.uom,
p.product_category,
w.as400_warehouse,
w.atp_qty,
p.updated,
(SELECT t.regular_discount FROM tabjbmaw t WHERE t.accountnum = '73050' AND p.numeric_line_code = t.numeric_line_code AND p.sub_code = t.sub_code LIMIT 1)
FROM
part p
JOIN warehouse w ON w.sap_article_id = p.sap_article_id;