The REPLACE INTO acts as DELETE/INSERT for duplicates. MySQL provides the ON DUPLICATE KEY UPDATE option to INSERT, which accomplishes this behavior. MySQL REPLACE INTO or UPDATE. One more issue I can think of is having triggers or cascade delete in the database. The story here seems to be the following – REPLACE INTO existed forever, at least since MySQL 3.22 and was a way to do replace faster and what is also important atomically, remember at that time MySQL only had ISAM … For instance if your table contains a column "lastname" which you didn't supply a value for, INSERT OR REPLACE will nullify the "lastname" if possible (constraints allow it) or fail. The INSERT ON DUPLIACTE UPDATE is true update. But, if it already exists, then UPSERT performs an UPDATE. However, there are other statements like INSERT IGNORE or REPLACE, which can also fulfill this objective. The REPLACE function is easy to use and very handy with an UPDATE statment. You can supply the values for the SET clause from a SELECT statement that queries data from other tables.. For example, in the customers table, some customers do not have any sale representative. Really, Why MySQL has both of these, especially both are non ANSI SQL extensions ? (table will have primary keys) I just want insert row if row does not exist with the primary key else i want to update with new values . I'm currently working on such a statement and figured out another fact to notice: INSERT OR REPLACE will replace any values not supplied in the statement. INSERT OR REPLACE INTO table . MySQL UPSERT with mysql tutorial, examples, functions, programming, mysql, literals, cursor, procedure, regexp_like(), regexp_replace operator, regular expression, crud etc. In this example, the REPLACE() function replaces @classicmodelcars.com in the email column with @mysqltutorial.org.. 4) Using MySQL UPDATE to update rows returned by a SELECT statement example. correction: both REPLACE and INSERT...ON DUPLICATE KEY UPDATE are non-standard, proprietary inventions specific to MySQL. If you have a child table defined with “on delete CASCADE”, the REPLACE INTO will delete the child record too. Bug #29019: REPLACE/INSERT IGNORE/UPDATE IGNORE doesn't work: Submitted: 11 Jun 2007 14:53: Modified: 7 Jul 2007 19:01: Reporter: Antony Curtis: Email Updates: This article covers using the REPLACE function to selectively replace text inside a string in SQL Server. Thanks in advance This operation allows the DML users to insert a new record or update existing data into a table. Update is the better way to do it then delete and insert as the REPLACE is doing i.e., one operation vs. two. Let’s understand – If a record is new, then UPSERT triggers an INSERT. For example, if column a is declared as UNIQUE and contains the value 1, the following two statements have similar effect: . Jonathan Haddad writes about REPLACE INTO and INSERT ON DUPLICATE KEY UPDATE. 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; After ‘replace into …’, it shows ‘3 rows affected ‘, two rows have been deleted and just one row is inserted into t1. Using REPLACE in an UPDATE statement. ANSI SQL 2003 defines a MERGE statement that can solve the same need (and more), but MySQL does not support the MERGE statement. I will use INSERT ON DUPLICATE rather than the REPLACE INTO … As in case of REPLACE you mind end up having related rows deleted as REPLACE will first delete and then insert if the row with the same ID already exists. 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