将变量添加到case语句中，然后输出

kd3sttzy 于 2021-06-02 发布在 Hadoop

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如果我在 Impala 中有以下代码：

(CASE 
  WHEN a3.shipped_qty1 > a4.shipped_qty2 AND a1.min1 < a2.min2 THEN "KEEP"
  WHEN a3.shipped_qty1 < a4.shipped_qty2 AND a1.min1 < a2.min2 THEN "MOVE"
  WHEN a3.shipped_qty1 > a4.shipped_qty2 AND a1.min1 > a2.min2 THEN "MOVE"
  WHEN a3.shipped_qty1 < a4.shipped_qty2 AND a1.min1 > a2.min2 THEN "KEEP"
  ELSE "NOT SHIPPING"
END) AS move

我希望文本输出如下内容：

(CASE 
  WHEN a3.shipped_qty1 > a4.shipped_qty2 AND a1.min1 < a2.min2 THEN "KEEP"
  WHEN a3.shipped_qty1 < a4.shipped_qty2 AND a1.min1 < a2.min2 THEN "MOVE TO**a3.supplier**"
  WHEN a3.shipped_qty1 > a4.shipped_qty2 AND a1.min1 > a2.min2 THEN "MOVE TO**a4.supplier**"
  WHEN a3.shipped_qty1 < a4.shipped_qty2 AND a1.min1 > a2.min2 THEN "KEEP"
  ELSE "NOT SHIPPING"
END) AS move

我该如何编写代码？

hadoop mysql impala

来源：https://stackoverflow.com/questions/42143312/adding-a-variable-into-a-case-statement-then-output

1条答案

按热度按时间

sqougxex1#

你可以用 CONCAT() 要生成输出字符串：

(CASE 
  WHEN a3.shipped_qty1 > a4.shipped_qty2 AND a1.min1 < a2.min2 THEN "KEEP"
  WHEN a3.shipped_qty1 < a4.shipped_qty2 AND a1.min1 < a2.min2 THEN concat("MOVE TO**",coalesce(a3.supplier,''),"**")
  WHEN a3.shipped_qty1 > a4.shipped_qty2 AND a1.min1 > a2.min2 THEN concat("MOVE TO**",coalesce(a4.supplier,''),"**")
  WHEN a3.shipped_qty1 < a4.shipped_qty2 AND a1.min1 > a2.min2 THEN "KEEP"
  ELSE "NOT SHIPPING"
END) AS move

p、我还把供应商的价值 Package 在 COALESCE() 因为我不知道这些列是否可以为null，否则如果这些值为null，查询将失败。

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将变量添加到case语句中，然后输出

1条答案

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