INSERT INTO courses1 (sys_id,name, location)
SELECT *
FROM courses
WHERE sys_id= $sysid
I have the two tables above and I want to insert in course1 what I have in course. But I get problem with sys_id
because I get Integrity constraint violation: 1062 Duplicate entry '1' for key 'PRIMARY'' in
so what I did is a added a column in courses1 named system_id
but then I get another error saying column not match.
Tried
INSERT IGNORE INTO
but ther result is not what I am expecting. The result I want is to have the data from course to course1 everytime I make a transaction. I want the data not to be overriden.
insert into
when inserting same row(same primary key)? UPDATE
My aim is to back-up the data (historical data). I want to record the data before editing it. basically what i am doing is inserting the data in another table before updating it
This question is a perfect example that demonstrates the fact that to give an answer, one have to understand the context of the question, not just write an automated post triggered by some keyword in the question.
If you want a history table, it have to have a different structure from the main table. At least it should have a non-unique key for the id from the main table.
So, make a history table of the same structure, but add a main_id
field. That gives you a structure like
id
manin_id
name
location
Then, to add a record into a history table,
INSERT INTO courses_history SELECT NULL, * FROM courses WHERE sys_id=?
you may want also to add an index (non-unique) for the main_id
field.
This way it will allow to store multiple "replicas" of the same row from the main table.
To get the last replica, you need a query like this:
SELECT * FROM courses_history WHERE sys_id=? ORDER BY id desc
Make a PRIMARY KEY AUTO INCREMENT
named courses1_id
, add one more field in courses1
table named courses_id
and change your query
CREATE TABLE `courses1` (
`courses1_id` INT(11) NOT NULL AUTO_INCREMENT ,
`courses_id` INT(11) NOT NULL ,
`name` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,
`location` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,
PRIMARY KEY (`courses1_id`),
INDEX (`courses_id`));
INSERT INTO `courses1` (`courses_id`,`name`, `location`)
SELECT *
FROM `courses`
WHERE `courses_id`= $id
OR just use a DATETIME
field in your courses1
table to keep a reference of the date before change
CREATE TABLE `courses1` (
`date_added` DATETIME NOT NULL ,
`courses_id` INT(11) NOT NULL ,
`name` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,
`location` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,
INDEX (`courses_id`));
INSERT INTO `courses1` (NOW(),`courses_id`,`name`, `location`)
SELECT *
FROM `courses`
WHERE `courses_id`= $id
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