How to Avoid Duplicate Entries When Inserting Data into SQLite?

Avoiding Duplicate Insertions in SQLite

SQLite, a popular lightweight database engine, lacks explicit support for the IF NOT EXISTS clause commonly found in other SQL implementations. This hurdle can perplex developers accustomed to leveraging such functionality to prevent duplicate record insertions.

To circumvent this limitation, SQLite offers several workarounds. One approach is to utilize the INSERT OR IGNORE command:

INSERT OR IGNORE INTO EVENTTYPE (EventTypeName) VALUES ('ANI Received');

This command will insert a new record if the specified EventTypeName does not already exist in the EVENTTYPE table.

Another option is to employ a subquery within the INSERT statement:

INSERT INTO EVENTTYPE (EventTypeName)
SELECT 'ANI Received'
WHERE NOT EXISTS (SELECT 1 FROM EVENTTYPE WHERE EventTypeName = 'ANI Received');

This approach checks for the existence of the record before inserting it, effectively achieving the same result as the IF NOT EXISTS clause.

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