[英]How to inner join two or more tables together in a query?
我想要結果的查詢應該在我的 customer_info 表中更新。 我知道表之間有任何關系,但是我必須使用內部聯接來運行查詢。 請幫忙。
當前標簽表
_reader_ID_|__tag_no__|__area |_maxtime_____
| | |
標簽日志表
reader_ID_|__tag_no__|timestamp___
| |
Aisle_info 表
reader_ID_|_area_|
| |
客戶信息表
name_|__email__|__reader_id |_tag_no|_area|_maxtime_
| | | | |
INSERT INTO customer_info
SELECT aisle_info.reader_ID, tag_no, aisle_info.area, customer_info.name, TIMESTAMPDIFF(SECOND,MIN(timestamp),MAX(timestamp)) AS MAXTIME FROM tag_logs INNER JOIN aisle_info ON tag_logs.reader_ID = aisle_info.reader_ID AND customer_info INNER JOIN current_tags ON customer_info.name = customer_info.name
WHERE tag_no = 3222813112261
1052 - 字段列表中的“tag_no”列不明確
當一列存在於多個表中時,您應該添加表名,以便假設 tag_no 存在於 tag_logs 表中,請嘗試 tag_logs.tag_no
INSERT INTO customer_info
SELECT aisle_info.reader_ID
, tag_logs.tag_no
, aisle_info.area
, customer_info.name
, TIMESTAMPDIFF(SECOND,MIN(timestamp)
,MAX(timestamp)) AS MAXTIME
FROM tag_logs
INNER JOIN aisle_info ON tag_logs.reader_ID = aisle_info.reader_ID
AND customer_info
INNER JOIN current_tags ON customer_info.name = customer_info.name
WHERE tag_logs.tag_no = 3222813112261
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