postgresqlHow do I use PostgreSQL's ON CONFLICT clause?

The ON CONFLICT clause is a PostgreSQL extension to the SQL standard's INSERT statement. It allows the user to specify an alternative action to take when a unique constraint or primary key violation occurs.

Example code

INSERT INTO table_name (column_name1, column_name2)
VALUES (value1, value2)
ON CONFLICT (column_name1) DO UPDATE SET column_name2 = value2;

This example will insert a row with value1 and value2 into table_name, unless a row with value1 already exists in the column_name1 column. In that case, the existing row will be updated with value2.

The ON CONFLICT clause can also take other actions, such as ignoring the row, or performing a custom function.

Code explanation

• INSERT INTO table_name (column_name1, column_name2) - Inserts a row into the specified table, with the specified columns.
• VALUES (value1, value2) - Specifies the values to be inserted into the row.
• ON CONFLICT (column_name1) DO UPDATE SET column_name2 = value2; - Specifies what action to take if a row with value1 already exists in the column_name1 column.

Helpful links

• PostgreSQL Documentation - INSERT
• PostgreSQL Documentation - ON CONFLICT

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