如何同时查询和计数以及不同计数？

Question

SELECT * FROM UserTable limit 100 ORDER BY userID ASC offset 0 ROWS;
SELECT COUNT(*) FROM UserTable;
SELECT COUNT(DISTINCT email) FROM UserTable;

How to combine it all into one query?

Expected output should be something like

totalCount    distinctCount    userID    email ...
100000        1000             1         qwerty@qwerty.com
100000        1000             2         qwerty@qwerty.com
100000        1000             3         abc.abc.com
...

Answer 1

You could use a cross join on the count subquery

  SELECT t.totalCount, t.distinctCount, UserTable.* 
  FROM UserTable 
  cross join (
    SELECT COUNT(*)  totalCount, COUNT(DISTINCT email) as distinctCount
    FROM UserTable
  ) t 
  ORDER BY userID ASC limit 100 

Answer 2

here you are:

    select 
(select count(*) from UserTable a) as count,
(select count(DISTINCT quarter) from UserTable b) as distinctCount,
c.* from UserTable as c order by userID ASC limit 100;

Answer 3

You're looking for a group by:

Try following query:

SELECT * FROM UserTable limit 100 ORDER BY userID ASC offset 0 ROWS GROUP BY email

Answer 4

You could achieve it using subquery Join in MySQL:

SELECT UserTable.*, tc.totalCount, dc.distinctCount
FROM UserTable 
JOIN (
    SELECT COUNT(*) as totalCount
    FROM UserTable
) tc
JOIN (
    SELECT COUNT(DISTINCT email) as distinctCunt
    FROM UserTable
) dc
ORDER BY userID ASC 
LIMIT 100