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1 cze 2015 · If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row is performed. Please read URL for more details.
2 lut 2024 · Sometimes it may be required to Insert the data if the same data is already present in the table. In this article, we will look into the methods of updating data if already exists else insert the same data if the data does not exist, with examples.
17 paź 2024 · The MERGE statement in SQL can insert a new record into a table or update the existing record if it already exists. It is supported by databases like Oracle, SQL Server, and PostgreSQL. Let’s look at how we can use the MERGE statement: MERGE INTO Department AS target.
13 mar 2022 · While developing an application with a database, frequently you will need to provide an option to update the data if a row exists else insert a row. This kind of operation is needed mainly for the master tables like the customer table, user table, etc. Developers use several workarounds to update if a row exists or else insert.
20 sty 2015 · IF EXISTS(select * from test where id=30122) update test set name='john' where id=3012 ELSE insert into test(name) values('john'); Other approach for better performance is update test set name='john' where id=3012 IF @@ROWCOUNT=0 insert into test(name) values('john');
If the EmployeeID already exists, then the First and LastName are updated. If there is a new record, it gets added to the table. Alternatively also check the MERGE statement which allows you to performs insert, update, or delete operations in a single statement.
23 gru 2009 · One options is using on duplicate update syntax. http://dev.mysql.com/doc/refman/5.1/en/insert-on-duplicate.html. Other options is doing select to figure out if record exists and then doind inser/update accordingly. Mind that if you're withing transaction select will not explicitly terminate the transaction so it's safe using it.
