Question

我正在尝试编写以下更新语句;

        UPDATE @eticat
        SET eticat_purchase_total = t.eticat_purchase_total
        FROM (
        SELECT eticat_id, COUNT(eticat_id) as eticat_purchase_count
            FROM etransaction
                INNER JOIN etransaction_item 
                    INNER JOIN etransaction_item_catalog ON eti_eticat_id = eticat_id 
                ON eti_et_id = et_id
        WHERE et_cmc_id = @can_cmc_id 
        GROUP by eticat_id
        ) as t
        WHERE eticat_id = t.eticat_id

但它一直在抱怨暧昧的专栏。有人可以告诉我我做错了什么。

编辑：错误消息是“不明确的列名'eticat_id'。”

该行是'WHERE eticat_id = t.eticat_id'

Answer 1

首先，那不是CTE;它是一个派生表。相似，但不同：）

其次，您正在更新未包含在FROM子句中的表变量，这会使SQL Server感到困惑。尝试类似：

UPDATE x
        SET eticat_purchase_total = t.eticat_purchase_total
        FROM (
        SELECT eticat_id, COUNT(eticat_id) as eticat_purchase_count
            FROM etransaction
                INNER JOIN etransaction_item 
                    INNER JOIN etransaction_item_catalog ON eti_eticat_id = eticat_id 
                ON eti_et_id = et_id
        WHERE et_cmc_id = @can_cmc_id 
        GROUP by eticat_id
        ) as t JOIN @eticat x ON x.eticat_id = t.eticat_id

使用派生表更新语句

1 个答案: