SQL不是单个组组函数错误

Question

我很难让我的oracle开发人员查询正确输出.当我有avg函数时,它不会给我一个组组错误.当我拿出来它工作正常.我尝试过使用group而不是order by但是它告诉我它不是按表达式分组.

SELECT LGBRAND.BRAND_ID, LGBRAND.BRAND_NAME, AVG(LGPRODUCT.PROD_PRICE)AS AVGER
FROM LGPRODUCT, LGBRAND
WHERE LGPRODUCT.BRAND_ID = LGBRAND.BRAND_ID
ORDER BY BRAND_NAME;

Answer 1

在查询中包含聚合函数(如avg,sum)时,必须按所有未聚合的列进行分组.

SELECT LGBRAND.BRAND_ID, LGBRAND.BRAND_NAME, AVG(LGPRODUCT.PROD_PRICE)AS AVGER
FROM LGPRODUCT, LGBRAND
WHERE LGPRODUCT.BRAND_ID = LGBRAND.BRAND_ID
GROUP BY
LGBRAND.BRAND_ID,
LGBRAND.BRAND_NAME
ORDER BY BRAND_NAME