如何在配置单元中使用更新来编写case语句

Question

UPDATE  fact_orders1
SET m_order_created = (CASE WHEN fact_orders1.order_number = so.order_num THEN 1 ELSE 0 END)
WHERE order_number in (
  SELECT so.order_num 
  FROM s_order so
  JOIN s_order_item soi ON so.ROW_ID = soi.ORDER_ID
  JOIN s_product sp ON soi.PROD_ID = sp.ROW_ID
  JOIN s_order_type sot ON so.ORDER_TYPE_ID = sot.ROW_ID 
  JOIN s_order_x sox ON so.ROW_ID=sox.PAR_ROW_ID
  WHERE (SUBSTR(LTRIM(sp.NAME), 1,3) IN ('VIP','BIZ')
  OR sp.NAME IN ('HSBB Business 10 Mbps','HSBB Business 20 Mbps','HSBB Residential 10 Mbps','HSBB Residential 20 Mbps'))
  AND sot.NAME = 'New Install' AND sp.PROD_CD = 'Promotion' AND sox.ATTRIB_11 = 'Y'
)

错误

  

====
  FAILED：SemanticException [错误10004]：行1:82无效的表别名或列引用＆＃39;所以＆＃39; :(可能的列名是：order_number，created，last_upd，m_order_created）

如何解决这个问题？

Answer 1

您无法在外部查询中引用子查询中的表，错误位于第二行：

CASE WHEN fact_orders1.order_number = so.order_num THEN 1 ELSE 0 END

so限定符将不会被评估，您需要加入fact_orders1和order_num才能匹配order_number和order_num。