Connect and share knowledge within a single location that is structured and easy to search. ... on duplicate key update records= CONCAT_WS(';',records,?) Then, query the data from the devices table to verify the insert: Now, we have three rows in the devices table. MySQL Forums Forum List » Newbie. How to repeat: CREATE TABLE `test` ( `test1` varchar(3) NOT NULL, `test2` varchar(4) NOT NULL, PRIMARY KEY (`test1`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; -- -- Data i tabell `test` -- INSERT INTO `test` (`test1`, … @Tresdin, As far as I can tell it is just syntactic sugar. The row/s affected value is reported as 1 if a row is inserted, and 2 if a row is updated, unless the API's CLIENT_FOUND_ROWSflag is set. I have the following query: ON DUPLICATE KEY UPDATE. If a duplicate error occurs, it will update the existing row with the value specified in the ON DUPLICATE KEY UPDATE clause. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect: . Try something like this: INSERT INTO example (id, a, b, c) VALUES (1,1,2,3) ON DUPLICATE KEY UPDATE a = VALUES(a), b = VALUES(b), c = VALUES(c); Now if, the id is duplicate, the row will update. Is an orbiting object traveling along a geodesic in general relativity? So long as you don't have a primary key on the table that would be fine, but if you do, then if any other table references that primary key, You can't reference the values in the old rows so you can't do an equivalent of. For details, please look at the repro steps. INSERT INTO t1 (a,b,c) VALUES (1,2,3) ON DUPLICATE KEY UPDATE c=c+1; UPDATE t1 SET c=c+1 WHERE a=1; Re: ON DUPLICATE KEY UPDATE. Asking for help, clarification, or responding to other answers. Any ideas? It was introduced in MySQL 4.1 but I still constantly see people unaware of it. Alternatively, you can use: INSERT INTO table (id,a,b,c,d,e,f,g) VALUES (1,2,3,4,5,6,7,8) ON DUPLICATE KEY UPDATE a=a, b=b, c=c, d=d, e=e, f=f, g=g; To get the id from LAST_INSERT_ID; you need to specify the backend app you're using for the same. To get the id from LAST_INSERT_ID; you need to specify the backend app you're using for the same. You won't need to re-specify all the fields. You should re-read the question @WayneWorkman, this is the correct answer. As @Bùi Việt Thành pointed out, using, So, I can't stick with the primary key before a. If your older values are the same as your new ones, why would you need to update it in any case? Basically, the statement first tries to insert a new row into the table. The syntax of INSERT ON DUPLICATE KEY UPDATE statement is as follows: The only addition to the INSERT statement is the ON DUPLICATE KEY UPDATE clause where you specify a list of column-value-pair assignments in case of duplicate. I added that comment because the questions and answers left me unsure about unmentioned columns with this kind of INSERT, which I then tested after learning exactly what to test. Why are video calls so tiring? How To Unlock User Accounts in MySQL Server. Here mysql will retrun the number of affected rows based on the action it performed. there is a constraint violation if the index is also a foreign key for another table, it's triggered by delete part. wont this would slow the process on large datasets and like importing csv's with 100K or more rows? but this won't work when the MySQL database is at the back end of ... ON DUPLICATE KEY UPDATE ... (David Jones. Field id has a "unique index", so there can't be two of them. However, in the stored procedure I need 10 unique random numbers inserted that are specified in the while loop. New Topic. Improve this answer. MySQL Forums Forum List » Newbie. Mysql perform a lock on every update or delete and generally locks the set of records scanned in the index while processing the SQL statement. As I wrote before, we can do two queries. INSERT INTO table1 (id, dept, date, count) VALUES (1, 4, 2018-01-15, 3), (2, 3, 2018-01-15, 4), (3, 3, 2018-01-15, 14), (4, 2, 2018-01-15, 11) ON DUPLICATE KEY UPDATE count = VALUES (count) If id = 1 already exists, this will set its count to 3 and leave all the other columns unchanged. INSERT ON DUPLICATE KEY UPDATE leaves unmentioned columns unchanged on UPDATE but gives them default values on INSERT. If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row occurs. This function works good. How to use ON DUPLICATE KEY UPDATE in MySQL without a UNIQUE index or PRIMARY KEY? Copyright © 2021 by www.mysqltutorial.org. Just in case you are able to utilize a scripting language to prepare your SQL queries, you could reuse field=value pairs by using SET instead of (a,b,c) VALUES(a,b,c). We use ON DUPLICATE KEY UPDATE in order that the summarization overwrites earlier calculations, but are having difficulty because one of the columns in the summary table's UNIQUE KEY is an optional FK, and contains NULL values. Posted by: M A Date: October 05, 2016 09:43PM Thanks for reply. I created a table with one field called RandomNumber that is set as Primary key and Unique. AFAIK, the method of restating each column. This unique key can be a Primary Key or not.
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