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 . And be sure you use single quotes for inserting strings. How to insert value into primary key column in. Więcej wyników z stackoverflow.
INSERT INTO table_name (username, password) . Kopia Podobne Tłumaczenie strony 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 , MySQL performs.
Auto-increment allows a unique number to be generated automatically when a new record is inserted into a table. Often this is the primary key field that we . When you insert data into tables with referential constraints, you need to. If you are inserting data into a parent table with a parent key , SQL does not allow:. INT PRIMARY KEY IDENTITY ( 1),. The idea is that when you insert a new row into the table, PostgreSQL will update.
So I decided to TEST both methods in my application and using the actual database. When inserting a recor if the record already exists in the table (based on the unique or primary key ), the insert will fail. However, if you know that the record .