在当前查询中使用 round 时需要帮助

Question

SELECT
    (TS_LEXIZE('english_stem',
               UNNEST(STRING_TO_ARRAY(
                   REGEXP_REPLACE(feedback, '[^a-zA-Z]+', ' ', 'g'),
                   ' ')
               )))[1] AS token,
    AVG(rating) AS avg_rating
FROM customer_survey 
GROUP BY 1
HAVING COUNT(1) >= 3
ORDER BY 2 DESC
;

我有以下查询，如果你想将评分限制为小数点后两位，你会在哪里添加 ROUND ()？

Answer 1

SELECT
    (TS_LEXIZE('english_stem',
               UNNEST(STRING_TO_ARRAY(
                   REGEXP_REPLACE(feedback, '[^a-zA-Z]+', ' ', 'g'),
                   ' ')
               )))[1] AS token,
    ROUND(AVG(rating)) AS avg_rating
FROM customer_survey 
GROUP BY 1
HAVING COUNT(1) >= 3
ORDER BY 2 DESC
;

通过在 avg 之前添加回合，我得到了它。