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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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MAXDB_STMT_SQLSTATE(3)							 1						    MAXDB_STMT_SQLSTATE(3)

maxdb_stmt_sqlstate - Returns SQLSTATE error from previous statement operation

SYNOPSIS
string maxdb_stmt_sqlstate (resource $stmt) DESCRIPTION
Returns a string containing the SQLSTATE error code for the most recently invoked prepared statement function that can succeed or fail. The error code consists of five characters. '00000' means no error. The values are specified by ANSI SQL and ODBC. Note Note that not all MaxDB errors are yet mapped to SQLSTATE's. The value HY000 (general error) is used for unmapped errors. RETURN VALUES
Returns a string containing the SQLSTATE error code for the last error. The error code consists of five characters. '00000' means no error. EXAMPLES
Example #1 Object oriented style <?php /* Open a connection */ $maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB"); /* check connection */ if (maxdb_connect_errno()) { printf("Connect failed: %s ", maxdb_connect_error()); exit(); } $maxdb->query("CREATE TABLE temp.mycity LIKE hotel.city"); $maxdb->query("INSERT INTO temp.mycity SELECT * FROM hotel.city"); $query = "SELECT name, zip FROM temp.mycity ORDER BY name"; if ($stmt = $maxdb->prepare($query)) { /* drop table */ $maxdb->query("DROP TABLE temp.mycity"); /* execute query */ $stmt->execute(); printf("Error: %s. ", $stmt->sqlstate); /* close statement */ $stmt->close(); } /* close connection */ $maxdb->close(); ?> Example #2 Procedural style <?php /* Open a connection */ $link = maxdb_connect("localhost", "MONA", "RED", "DEMODB"); /* check connection */ if (maxdb_connect_errno()) { printf("Connect failed: %s ", maxdb_connect_error()); exit(); } maxdb_query($link, "CREATE TABLE temp.mycity LIKE hotel.city"); maxdb_query($link, "INSERT INTO temp.mycity SELECT * FROM hotel.city"); $query = "SELECT name, zip FROM temp.mycity ORDER BY name"; if ($stmt = maxdb_prepare($link, $query)) { /* drop table */ maxdb_query($link, "DROP TABLE temp.mycity"); /* execute query */ maxdb_stmt_execute($stmt); printf("Error: %s. ", maxdb_stmt_sqlstate($stmt)); /* close statement */ maxdb_stmt_close($stmt); } /* close connection */ maxdb_close($link); ?> The above example will output something similar to: Warning: maxdb_stmt_execute(): -4004 POS(23) Unknown table name:MYCITY [42000] <...> Error: 42000. SEE ALSO
maxdb_stmt_errno(3), maxdb_stmt_error(3). PHP Documentation Group MAXDB_STMT_SQLSTATE(3)
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