PostgresSql在执行时引发语法错误

Question

我想根据某种条件通过合并其他三个表来更新一个表。 losid在所有三个表中都很常见。我的查询如下：

UPDATE "rpChange"."rpChanget" AS a 
 SET "hold" = CASE  
WHEN status"."losid" IS NULL  and mUpdate."losid" IS NULL and dealer."losid" IS NULL
 THEN 'N' 
WHEN (status."losid" IS NOT NULL and COALESCE(age(NOW(), status."updateDt"),age(NOW(), status."createDt")) < '30 minutes'  and status."publishedYN"='Y') or 
(mUpdate."losid" IS NOT NULL and COALESCE(age(NOW(), mUpdate."updateDt"),age(NOW(), mUpdate."createDt")) < '30 minutes'  and mUpdate."publishedYN"='Y') or 
(dealer."losid" IS NOT NULL and COALESCE(age(NOW(), dealer."updateDt"),age(NOW(), dealer."createDt")) < '30 minutes'  and dealer."publishedYN"='Y')
 THEN 'Y' 
  END 
 ,"holdR" = CASE  
  WHEN status."losid" IS NULL  and mUpdate."losid" IS NULL and dealer."losid" IS NULL
 THEN NULL 
WHEN (status."losid" IS NOT NULL and COALESCE(age(NOW(), status."updateDt"),age(NOW(), status."createDt")) < '30 minutes'  and status."publishedYN"='Y') or 
(mUpdate."losid" IS NOT NULL and COALESCE(age(NOW(), mUpdate."updateDt"),age(NOW(), mUpdate."createDt")) < '30 minutes'  and mUpdate."publishedYN"='Y') or 
(dealer."losid" IS NOT NULL and COALESCE(age(NOW(), dealer."updateDt"),age(NOW(), dealer."createDt")) < '30 minutes'  and dealer."publishedYN"='Y')
 THEN 'SCHEDULED FOR LATER'
  END 
 FROM "statuss"."statusSt" AS status 
 ,"mUpdates"."mUpdateSt" AS mUpdate
 , "dealers"."dealerSt" AS dealer
 WHERE status."losid" = a."losid" 
 AND mUpdate."losid" = a."losid"
 AND dealer."losid" = a."losid";

以上查询在添加COALESCE（）之前有效，但添加后会引发语法错误。谁能帮我，这是怎么了。