admin

SQL COUNT * GROUP BY大于,

sql

我想用出现次数选择不同的键,此查询似乎起作用:

SELECT ItemMetaData.KEY, ItemMetaData.VALUE, count(*) 
FROM ItemMetaData 
GROUP BY ItemMetaData.KEY 
ORDER BY count(*) desc;

但是我也想过滤这些结果,这意味着我只想在count(*)大于2500的情况下,才显示大于2500的发生率,但是:

SELECT * 
FROM 
(
    SELECT ItemMetaData.KEY, ItemMetaData.VALUE, count(*) 
    FROM ItemMetaData 
    GROUP BY ItemMetaData.KEY 
    ORDER BY count(*) desc
) as result WHERE count(*)>2500;

不幸的是,该查询导致语法错误。你能帮我达到我的要求吗?


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2021-05-10

共1个答案

admin

聚合的HAVING子句

SELECT ItemMetaData.KEY, ItemMetaData.VALUE, count(*) 
FROM ItemMetaData 
Group By ItemMetaData.KEY, ItemMetaData.VALUE
HAVING count(*) > 2500
ORDER BY count(*) desc;
2021-05-10