MySQL SELECT separately each day

Hello.

I’ve got a question .

Some months ago , I was working with some script selecting data from MySQL database from current month.

And I found a query in NET , for generating table with dates for 30 days , counting down from today.

First of all need create a table @ints


CREATE TABLE `@ints` ( i integer );
INSERT INTO `@ints` (`i`) VALUES ( 0 );
INSERT INTO `@ints` (`i`) VALUES ( 1 );
INSERT INTO `@ints` (`i`) VALUES ( 2 );
INSERT INTO `@ints` (`i`) VALUES ( 3 );
INSERT INTO `@ints` (`i`) VALUES ( 4 );
INSERT INTO `@ints` (`i`) VALUES ( 5 );
INSERT INTO `@ints` (`i`) VALUES ( 6 );
INSERT INTO `@ints` (`i`) VALUES ( 7 );
INSERT INTO `@ints` (`i`) VALUES ( 8 );
INSERT INTO `@ints` (`i`) VALUES ( 9 );

Then by simple query I was selecting 30 days table.

SELECT CURDATE() - INTERVAL t.i*100 + u.i*10 + v.i DAY 
  AS Date
    FROM `@ints` AS t 
      JOIN `@ints` 
          AS u
      JOIN `@ints` 
          AS v
        WHERE 
         ( t.i*100 + u.i*10 + v.i ) < 30
            ORDER BY 
               Date 

The problem is , that I cannot get it worked with another data part , which is located in another table - same database.

I want just simple show up a records for each day if match found. Otherwise there could a ZERO ( 0 ) returned instead of NULL.

Kind of data is a simple data of users/players. ( Name , Level , Experience , World , Date (for comparing)). ( <– That was my website game project . )

Sounds easy , compare then echo data. But I am little tired of it already , since can’t get it worked , that’s why I am asking here.

The whole idea is that it’s working as checking for matches only.

match - return 1 , otherwise 0.

But I would like to show up a some column info if match is found.

e.g a column “Experience” should be listed if match.



SELECT Statement - for a player with desired name.

2010-07-30 	0
2010-07-31 	0
2010-08-01 	0
2010-08-02 	0
2010-08-03 	0
2010-08-04 	0
2010-08-05 	0
2010-08-06 	0
2010-08-07 	0
2010-08-08 	0
2010-08-09 	0
( And here where match is found experience should be listed.)
2010-08-10 	234,213,001

That’s how I would like it to get worked.

Any solution?

first of all, please extend your @ints table to include as many numbers as you need (to avoid the cross join nonsense)

(the guy who wrote the solution you found on the web was trying too hard to be cute ;))

then use a LEFT OUTER JOIN –

SELECT CURRENT_DATE - INTERVAL n.i DAY AS thedate
     , COUNT(players.date) AS howmany
  FROM `@ints` AS n 
LEFT OUTER
  JOIN players
    ON players.date =  
       CURRENT_DATE - INTERVAL n.i DAY
GROUP
    BY thedate

:cool:

That’s fills all my needs.
Thanks Rudy.

you want this instead –

SELECT CURRENT_DATE - INTERVAL n.i DAY AS thedate
     , COUNT(players.date) AS howmany
  FROM `@ints` AS n 
LEFT OUTER
  JOIN players
    ON players.date =  
       CURRENT_DATE - INTERVAL n.i DAY
   [COLOR="Red"]AND players.name = 'Todd'[/COLOR]
GROUP
    BY thedate

notice that the player name condition is part of the join, and not part of the WHERE clause


How to get a SELECT records only for a one player by a name. (30 days table only for a player with desired name)

Here we’re getting a stats from whole database , column howmany shows amount of matches.

Was trying to add a WHERE statement after a JOIN , but after that getting only matched rows. ( if a player with X name has records only in one day from last month , showing only this one day not whole month)