如何在 MYSQL 中的 COUNT 中使用 SELECT

Question

我有这样的看法：

myVIEW: (id,percent)

我想再做一个视图，会是这样的：

LASTVIEW：（lastID、lastPR、计数器）

并且在“计数器”中，在每一行中我都希望货币 id 的百分比大于该行的百分比。所以我尝试了：

CREATE VIEW LASTVIEW(lastID, lastPR, counter) AS
SELECT id AS lastID, percent AS lastPR
COUNT (SELECT id FROM myVIEW WHERE percent < lastPR) AS counter,
FROM myVIEW;

Answer 1

你快到了。试试这个：

SELECT id AS lastID, percent AS lastPR, (SELECT Count(id) 
FROM myVIEW bigger 
WHERE bigger.percent > myv.percent) AS counter
FROM myVIEW myv

Answer 2

使用以下 select 查询创建视图

SELECT lastID,lastPR,counter
FROM (SELECT A.id AS lastID,A.percent AS lastPR,count(B.id) AS counter
FROM myVIEW A,myVIEW B WHERE B.percent<A.percent
GROUP BY A.id,A.percent)

如何在 MYSQL 中的 COUNT 中使用 SELECT

How to use SELECT inside COUNT in MYSQL

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