Question

I want to copy all the fields from the temp_sales table to sales table (after specific field). I want to do it quickest way as possible.. How to do this in SQL?

CREATE TABLE IF NOT EXISTS `temp_sales` (
  `field1` varchar(10) NOT NULL,
  `field2` varchar(20) NOT NULL,
  `field3` varchar(20) NOT NULL,
  `field4` varchar(50) NOT NULL,
  `field5` varchar(50) NOT NULL,
  `field6` varchar(50) NOT NULL,
  `field7` varchar(50) NOT NULL,
  `field8` tinyint(2) NOT NULL,
  `field9` tinyint(2) NOT NULL
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=13692 ;

In other word: There are some fields in the sales table. I want to add more new fields in the sales table from temp_sales (without data).

Answer 1

This is a 3-Step process:

.1. You need some unique or primary key field in temp_sales, that links a row in temp_sales to the corresponding row in sales (again via a unique/primary key)

.2. You need a DDL statement such as

ALTER TABLE `sales` 
  ADD COLUMN `field1`VARCHAR(10) AFTER `whatever`,
  ADD COLUMN `field2`VARCHAR(10) AFTER `fields2`,
...

.3. You need a DML statement such as

UPDATE `sales` 
INNER JOIN `temp_sales` ON `sales`.`keyfield`=`temp_sales`.`keyfield`
SET `sales`.`field1`=`tempsales`.`field1`,
  `sales`.`field2`=`tempsales`.`field2`,
  ...