在where子句中使用列别名

Question

我正在尝试删除所有具有productRef = productAssociated的行。我在下面尝试了查询，但是最后一行不起作用。

怎么了？

SELECT date, transaction.transactionId, 
       ref.productSKU as productRef, 
       associated.productSKU as productAssociated, 
       ARRAY_LENGTH(hits.product) as nbProducts
FROM `dl-recommendation-engine.NDA_CHANEL_137002018.ga_sessions_*` as session,
     UNNEST(hits) AS hits,
     UNNEST(hits.product) as ref,
     UNNEST(hits.product) as associated
WHERE _TABLE_SUFFIX BETWEEN '20191122' AND '20191202' AND
      hits.transaction.transactionId IS NOT NULL AND
     ARRAY_LENGTH(hits.product) > 2 AND
     productAssociated != productRef

Answer 1

您不能在where子句中使用表别名。

相反，只需使用表达式：

WHERE _TABLE_SUFFIX BETWEEN '20191122' AND '20191202' AND
      hits.transaction.transactionId IS NOT NULL AND
      ARRAY_LENGTH(hits.product) > 2 AND
      associated.productSKU <> ref.productSKU