Question

I would like to insert timestamp values of 3 minute steps (given a start and end date) into a table with just one timestamp column.

I currently switch from sql server to mysql. I would know how to do it for the former database in SQL but am not sure about the latter. Thanks.

This is my current (not working) miserable attempt:

DELIMITER //
CREATE PROCEDURE test()
begin
    declare StartTS TIMESTAMP DEFAULT null;
    declare EndTS TIMESTAMP DEFAULT null;

    set StartTS = '2012-01-01 00:00:00';
    set EndTS = '2014-01-01 00:00:00';

    start transaction;
      while StartTS < EndTS do
        insert into timestamps (TimeStampEntry) values (StartTS);
        SET StartTS  = StartTS  + INTERVAL 3 MINUTE;
      end while;
      commit;
end
//

DELIMITER ;

call test();

PS:

create table TimeStamps (
        Id INTEGER NOT NULL AUTO_INCREMENT,
       TimeStampEntry DATETIME,
       primary key (Id)
    )

current sproc:

DELIMITER $$

CREATE DEFINER=`root`@`localhost` PROCEDURE `myProc`(IN t1 timestamp, IN t2 timestamp)
BEGIN

  WHILE t1 <= t2 DO
INSERT INTO timestamps (TimeStampEntry) Values (t1)  ;
    SET t1 = DATE_ADD(t1, INTERVAL 180 SECOND);
    #SET t1 = t1 + INTERVAL 180 SECOND;
  END WHILE;
END

call:

CALL myProc('2010-01-01 00:00:00', '2014-01-01 00:00:00');

Answer 1

try something like this:

CREATE PROCEDURE myProc(IN t1 timestamp, IN t2 timestamp)
BEGIN

  WHILE t1 <= t2 DO
INSERT INTO test (ts) Values (t1)  ;
    SET t1 = DATE_ADD(t1, INTERVAL 3 MINUTE);
  END WHILE;
END;


CALL myProc(now(), ADDDATE(NOW(), INTERVAL 15 MINUTE));

http://sqlfiddle.com/#!2/5672e/9

Or change your line:

SET StartTS  = StartTS  + INTERVAL 3 MINUTE;

to

SET StartTS  = ADDDATE(StartTS, INTERVAL 3 MINUTE);