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

如果在查询中包含聚合函数（如avg，sum），则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

Answer 2

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;

或

SELECT LGBRAND.BRAND_ID, LGBRAND.BRAND_NAME, AVG(LGPRODUCT.PROD_PRICE)AS AVGER FROM LGPRODUCT INNER JOIN LGBRAND ON LGPRODUCT.BRAND_ID = LGBRAND.BRAND_ID GROUP BY LGBRAND.BRAND_ID, LGBRAND.BRAND_NAME ORDER BY BRAND_NAME;

注意
每当在SUM, COUNT, AVG, MIN, MAX,中使用聚合函数（SELECT ..）时，该SELECT中未包含在任何聚合函数中的所有其他列都必须包含GROUP BY子句

Answer 3

您正在使用AGGREGATION函数，为此，您必须对所有必须聚合的数据进行分组。

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 -- This line here
ORDER BY BRAND_NAME;

Answer 4

对于新添加的字段，您没有使用group by，因此您收到此错误，因此通过将新添加的字段包括在内，您将解决此错误并将所有必须的数据分组汇总。

SQL不是单个组组函数错误

4 个答案: