mysql query for selecting date

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Hello,

i want record from table by date. if any particular date, record is not available then date must come with null data.

eg.

  date--------------id---------name
2015/09/01-----------1---------abc1
2015/09/02-----------2---------abc2
2015/09/04-----------3---------abc3
2015/09/06-----------4---------abc4

and i want something like this.

  date--------------id---------name
2015/09/01-----------1---------abc1
2015/09/02-----------2---------abc2
2015/09/03---------null--------null
2015/09/04-----------3---------abc3
2015/09/05---------null--------null
2015/09/06-----------4---------abc4

Thnaks In Advance..

Posted 21-Sep-15 20:56pm

bburhanbohra

Updated 21-Sep-15 21:35pm

Maciej Los

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Maciej Los 22-Sep-15 3:36am

What have you tried?

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CHill60 · Accepted Answer · 2015-09-22T07:23:00

Unfortunately generating sequences in MySQL is not quite as easy as it is in MSSQL.

However, I adapted a solution by logan5 at SO[^]

This is my interpretation of your table:

SQL

CREATE TABLE your_table
(
  datecol DATE,
  id INT,
  namecol VARCHAR(255)
);
INSERT INTO your_table (datecol, id, namecol) VALUES('2015/09/01',1,'abc1');
INSERT INTO your_table (datecol, id, namecol) VALUES('2015/09/02',2,'abc2');
INSERT INTO your_table (datecol, id, namecol) VALUES('2015/09/04',3,'abc3');
INSERT INTO your_table (datecol, id, namecol) VALUES('2015/09/06',4,'abc4');

I created a "working" table

SQL

CREATE TABLE num (i int);
INSERT INTO num (i) VALUES (0), (1), (2), (3), (4), (5), (6), (7), (8), (9);

Which I then used in this query:

SQL

select adddate('2015-09-01', numlist.id) as `date` , y.id, y.namecol
from
(SELECT n1.i + n10.i*10 + n100.i*100 AS id
   FROM num n1 cross join num as n10 cross join num as n100) as numlist
LEFT OUTER JOIN your_table y on y.datecol = adddate('2015-09-01', numlist.id)
where adddate('2015-09-01', numlist.id) <= '2015-09-30';

It produces the results you are after.

If you are going to do this often it is probably worth setting up a permanent table of dates