错误：缺少表的FROM子句条目

Question

SELECT "region", sum("items"), sum("actcost")
FROM "apr","Regions"
WHERE "bnfname" LIKE 'Flucloxacillin %' AND apr.sha=Regions.sha
GROUP BY "region"

发出以下错误：

  

错误：缺少表“region”的FROM子句条目

Answer 1

试试这个：

SELECT "region", sum("items"), sum("actcost")
FROM "apr","Regions"
WHERE "bnfname" LIKE 'Flucloxacillin %' AND "apr"."sha"="Regions"."sha"
GROUP BY "region"

Answer 2

SELECT apr.region, 
       SUM(apr.items), 
       SUM(apr.actcost) 
FROM   apr, 
       Regions 
WHERE  apr.bnfname LIKE 'Flucloxacillin %' 
       AND apr.sha = regions.sha 
GROUP  BY apr.region

或使用加入

SELECT apr.region, 
       SUM(apr.items), 
       SUM(apr.actcost) 
FROM   apr 
       join regions 
         ON apr.sha = regions.sha 
WHERE  apr.bnfname LIKE 'Flucloxacillin %' 
GROUP  BY apr.region