MYSQL: Generate Calendar Table

gistfile1.txt

DROP TABLE IF EXISTS time_dimension;
CREATE TABLE time_dimension (
        id                      INTEGER PRIMARY KEY,  -- year*10000+month*100+day
        db_date                 DATE NOT NULL,
        year                    INTEGER NOT NULL,
        month                   INTEGER NOT NULL, -- 1 to 12
        day                     INTEGER NOT NULL, -- 1 to 31
        quarter                 INTEGER NOT NULL, -- 1 to 4
        week                    INTEGER NOT NULL, -- 1 to 52/53
        day_name                VARCHAR(9) NOT NULL, -- 'Monday', 'Tuesday'...
        month_name              VARCHAR(9) NOT NULL, -- 'January', 'February'...
        holiday_flag            CHAR(1) DEFAULT 'f' CHECK (holiday_flag in ('t', 'f')),
        weekend_flag            CHAR(1) DEFAULT 'f' CHECK (weekday_flag in ('t', 'f')),
        event                   VARCHAR(50),
        UNIQUE td_ymd_idx (year,month,day),
        UNIQUE td_dbdate_idx (db_date)

) Engine=MyISAM;

DROP PROCEDURE IF EXISTS fill_date_dimension;
DELIMITER //
CREATE PROCEDURE fill_date_dimension(IN startdate DATE,IN stopdate DATE)
BEGIN
    DECLARE currentdate DATE;
    SET currentdate = startdate;
    WHILE currentdate < stopdate DO
        INSERT INTO time_dimension VALUES (
                        YEAR(currentdate)*10000+MONTH(currentdate)*100 + DAY(currentdate),
                        currentdate,
                        YEAR(currentdate),
                        MONTH(currentdate),
                        DAY(currentdate),
                        QUARTER(currentdate),
                        WEEKOFYEAR(currentdate),
                        DATE_FORMAT(currentdate,'%W'),
                        DATE_FORMAT(currentdate,'%M'),
                        'f',
                        CASE DAYOFWEEK(currentdate) WHEN 1 THEN 't' WHEN 7 then 't' ELSE 'f' END,
                        NULL);
        SET currentdate = ADDDATE(currentdate,INTERVAL 1 DAY);
    END WHILE;
END
//
DELIMITER ;

TRUNCATE TABLE time_dimension;

CALL fill_date_dimension('1-01-01','2015-01-01');
OPTIMIZE TABLE time_dimension;

This was a big help. Thank you🤠

For people running into slow performance of this query, you could have autocommit on. This commits changes on every while loop iteration.

You can get BLAZINGLY fast with:

set autocommit = 0;
START TRANSACTION;
CALL fill_date_dimension('2001-01-01','2015-01-01');
commit;
set autocommit = 1;

It could be worth including the lines into the procedure definition. Just make sure to store the original autocommit value and assign it back at the end so that your procedure does not have the unwanted side-effect of implicitly changing autocommit. Something like:

...
BEGIN
    DECLARE currentdate DATE;
    SET @original_autocommit = @@autocommit;
    SET autocommit = 0;
    SET currentdate = startdate;
    START TRANSACTION;
    WHILE currentdate < stopdate DO
         ...
    END WHILE;
    COMMIT;
    SET autocommit = @original_autocommit;
END //