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SQL and distinct

开发者 https://www.devze.com 2023-03-13 09:47 出处:网络
I\'m having trouble on generating a report in MySQL.I have this table: CREATE TABLE users ( id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,

I'm having trouble on generating a report in MySQL. I have this table:

CREATE TABLE users (
    id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
    birthday DATE,
    title VARCHAR(255)
);

I need to generate a report that throws how many titles exist for a given month. My first idea was something like this:

SELECT COUNT(DISTINCT(MONTH(birthday)开发者_高级运维)) AS q 
  FROM users

Of course that only returns how many months exist in the records. What I need is something like this:

Month | Count
-------------
2     | 384
5     | 131
12    | 585


This should work:

SELECT MONTH(birthday), COUNT(*) AS BirthdayCount
FROM user
GROUP BY MONTH(birthday)

This will give you the month number and the count of the records in that month, thus what you are looking for.


Like this?

SELECT MONTH(birthday), COUNT(*)
FROM user
GROUP BY MONTH(birthday)


Even simpler:

SELECT MONTH(birthday), COUNT(*)
FROM user
GROUP BY 1


You need a GROUP BY month(birthday) in there.

select month(birthday), count(month(birthday)) 
from users 
group by month(birthday);
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