Case in Where 子句在 Teradata 上无法正常工作？

Question

谁能告诉我我的查询有什么问题。我肯定知道 where 子句中的 case 语句肯定有问题。如果没有 Case 语句，此查询将运行正常。

错误 - SELECT 失败。 3707:Syntax 错误，应为“)”和“>=”之间的“END 关键字”

SELECT 
    mp.chnl_name AS mp_channel,
    fsk.sku_prod_id AS pro_id,
    fsk.dateint  AS avlbl_dt,
    fsk.sku_num AS sku,
    fsk.upc_txt AS UPC,
    Coalesce(fsk.brand_name,'N/A') AS brand,
    fsk.ruckload AS LTL_Flag,
    fsk.price_amt AS item_selling_price,
    fsk.on_hand_unit_qty AS qoh,
    fsk.netpropt AS profite,
    (fsk.price_amt  + fsk.shpg_amt) AS lms,
    (GP)*100 AS net_pct
FROM EDW.ITEM_AVLBL mp
JOIN EDW.FULL_SKU fsk ON mp.item_id = fsk.item_id
JOIN  EDW.SHORT_SKU ssk ON ssk.sh_sku_id = fsk.sh_sku_id
WHERE 1=1
    AND mp.chnl_name  LIKE '%google%'  ---------- This is a prompt but I hard coded to test
    AND fsk.item_create_dt >=  '2019-10-20'
    AND  net_pct >= 10
    AND CASE WHEN mp.chnl_name  = 'CA_FACEBOOK'  THEN  ((GP)*100)  >= 7 ELSE  fsk.first_cost > 500 END
GROUP BY 1,2,3,4,5,6,7,8,9,10,11,fsk.first_cost

谁能告诉我如何解决这个问题？

Answer 1

不要使用 CASE:

( (mp.chnl_name = 'CA_FACEBOOK'  AND  ((GP)*100)  >= 7) OR
  (mp.chnl_name <> 'CA_FACEBOOK' AND fsk.first_cost > 500)
)

问题是 Teradata 不支持从 CASE 表达式返回布尔类型。因此，您在 THEN 子句中的比较在句法上无法理解。

编辑：

根据您的评论，您想要的逻辑是：

( (mp.chnl_name = 'CA_FACEBOOK'  AND  ((GP)*100)  >= 7 AND fsk.first_cost > 500
  ) OR
  (mp.chnl_name <> 'CA_FACEBOOK' )
)

Answer 2

大小写在这里不起作用，您可以重写以使用 AND 和 OR

AND ( (mp.chnl_name  = 'CA_FACEBOOK' AND ((GP)*100)  >= 7 ) 
    OR (mp.chnl_name  != 'CA_FACEBOOK' AND fsk.first_cost > 500) )

根据你下面所说的，在where中添加以下内容：

AND ( (mp.chnl_name  = 'CA_FACEBOOK' AND ((GP)*100)  >= 7 AND fsk.first_cost > 500)
      OR mp.chnl_name  != 'CA_FACEBOOK'
    )

Answer 3

这可能是您想要的：

WHERE 
  (mp.chnl_name <> 'CA_FACEBOOK' 
    AND mp.chnl_name  LIKE '%google%'  ---------- This is a prompt but I hard coded to test
    AND fsk.item_create_dt >=  '2019-10-20'
    AND  net_pct >= 10
OR (( mp.chnl_name  = 'CA_FACEBOOK' AND GP*100  >= 7 AND fsk.first_cost > 500))

但是如果你在你的应用程序中创建这个 WHERE 条件（1=1 似乎表明了这一点）你最好在那里应用你的逻辑。

Answer 4

根据您的意见，原来的 ELSE 条件应该改为 ANDed：

SELECT 
    mp.chnl_name AS mp_channel,
    fsk.sku_prod_id AS pro_id,
    fsk.dateint  AS avlbl_dt,
    fsk.sku_num AS sku,
    fsk.upc_txt AS UPC,
    Coalesce(fsk.brand_name,'N/A') AS brand,
    fsk.ruckload AS LTL_Flag,
    fsk.price_amt AS item_selling_price,
    fsk.on_hand_unit_qty AS qoh,
    fsk.netpropt AS profite,
    (fsk.price_amt  + fsk.shpg_amt) AS lms,
    (GP)*100 AS net_pct
FROM EDW.ITEM_AVLBL mp
JOIN EDW.FULL_SKU fsk ON mp.item_id = fsk.item_id
JOIN  EDW.SHORT_SKU ssk ON ssk.sh_sku_id = fsk.sh_sku_id
WHERE 1=1
    AND (mp.chnl_name  LIKE '%google%'  ---------- This is the prompt value
    AND fsk.item_create_dt >=  '2019-10-20'
    AND  net_pct >= 10
    AND (mp.chnl_name  <> 'CA_FACEBOOK' -- if not Facebook, don't care ORed terms
         OR (GP*100  >= 7 AND fsk.first_cost > 500))
GROUP BY 1,2,3,4,5,6,7,8,9,10,11 /* ,fsk.first_cost */

我认为您不想按 first_cost 分组。这隐含地假设 mp.chnl_name 不为 NULL，因此它等于 CA_FACEBOOK 或不等于。如果允许 NULL，您还需要明确检查该条件，例如(mp.chnl_name <> 'CA_FACEBOOK' OR mp.chnl_name IS NULL).

Answer 5

这对我有用，但我可能在描述中混淆了你们。非常感谢您的快速回复。非常感谢您的帮助和时间。

AND (CASE WHEN mp.sls_trans_web_orgn_chnl_name  = 'CA_FACEBOOK'  AND   fsk.full_sku_unit_first_cost  <  500 AND  (juice/NullIfZero(gms))*100  >= 7 THEN 1 
  WHEN mp.sls_trans_web_orgn_chnl_name  <> 'CA_FACEBOOK'  THEN 1 ELSE 0 END ) = 1

Case in Where 子句在 Teradata 上无法正常工作？

Case in Where clause not working properly on Teradata?

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