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Full Discussion: SQL: copying data down
Top Forums Programming SQL: copying data down Post 302577655 by figaro on Tuesday 29th of November 2011 02:21:00 PM
Old 11-29-2011
SQL: copying data down
I have a series of observations of which one column is sometimes missing (zero):

Code:
date	temp	delta
1977	284.54	29.84
1978	149.82	0
1979	320.71	28.45
1980	176.76	0
1981	854.65	0
1984	817.65	0
1985	990.58	27.98
1986	410.21	0
1987	405.93	0
1988	482.9	0

What I would like to achieve is a SQL selection whereby the non-zero values are copied down, in other words, to achieve the following:

Code:
date	temp	delta
1977	284.54	29.84
1978	149.82	29.84
1979	320.71	28.45
1980	176.76	28.45
1981	854.65	28.45
1984	817.65	28.45
1985	990.58	27.98
1986	410.21	27.98
1987	405.93	27.98
1988	482.9	27.98

Is there a standard way to achieve this without having to resort to creating a procedural SQL script?

Code:
DROP TABLE IF EXISTS `temperatures`;
CREATE TABLE `temperatures` (
  `date` integer,
  `temp` double,
  `delta` double
) ENGINE=MyISAM;
INSERT INTO `temperatures` VALUES (1977,284.54,29.84), (1978,149.82,''), 
(1979,320.71,28.45), (1980,176.76,''), (1981,854.65,''), 
(1984,817.65,''), (1985,990.58,27.98), (1986,410.21,''), 
(1987,405.93,''), (1988,482.9,''), (1991,269.02,'');

 

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