![]() ON DUPLICATE KEY UPDATE statement and clause as an alternative approach for inserting into rows that might have duplicate UNIQUE or PRIMARY KEY values.īy only issuing INSERT or UPDATE instructions and never DELETE, utilizing INSERT. ![]() ON DUPLICATE KEY UPDATE to Update the Record if It Exists Else Insert It in the MySQL Table In this example, even though we only changed one item, the outcome shows that two rows were impacted because we DELETED the previous record and then INSERTED the new row to take its place. | id | department | employee_name | year_published | We’ve made the decision to change our department and joining_year of id = 101 record back to the original Operations record. When a matched data row is discovered, the existing row is erased using the usual DELETE statement, and the standard INSERT is then carried out.įor instance, assume we have an employees table with columns for id, department, employee_name, and joining_year.A typical INSERT statement is executed because no data row with the desired values could be discovered.There are two possible consequences for each issued command when using a REPLACE INTO statement: One approach is to use the REPLACE statement if you want to truly replace rows when the INSERT commands would fail due to duplicate UNIQUE or PRIMARY KEY values as described previously. Use REPLACE INTO to Update the Record if It Exists Else Insert It in the MySQL Table ![]() When it’s required to insert rows after determining if they are, in fact, new or already exist, MySQL offers several helpful statements. Update Record if It Exists Else Insert It in the MySQL Table This article outlines the methods that can be used to correct this mistake and get a better result. MySQL will send an alert if a user tries inserting a record that already exists or has a duplicate PRIMARY KEY value. The database managers may occasionally need to add a record to the MySQL table or update one if it is regularly present.
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