An introduction to auto-increment columns in Apache Doris, usage, applicable scenarios, and implementation details.
The auto-increment column is a bread-and-butter feature of single-node transactional databases. It assigns a unique identifier for each row in a way that requires the least manual effort from users. With an auto-increment column in the table, whenever a new row is inserted into the table, the new row will be assigned with the next available value from the auto-increment sequence. This is an automated mechanism that makes database maintenance easy and reliable.
`demo`.`dwd_dup_tbl` NOT NULL, `dim1` varchar NOT NULL, `dim2` varchar NOT NULL, `dim3` varchar NOT NULL, `dim4` varchar NOT NULL, `dim5` varchar NOT NULL, `visit_time` DATE NOT NULL ) ENGINE=OLAP DUPLICATE KEY DISTRIBUTED BY HASH BUCKETS 32 PROPERTIES ; Create a dictionary table as follows leveraging AUTO_INCREMENT:
loan_records DEFAULT NULL COMMENT 'Customer ID', `loan_amount` DECIMAL DEFAULT NULL COMMENT 'Amount of loan', `interest_rate` DECIMAL DEFAULT NULL COMMENT 'Interest rate', `loan_start_date` DATE DEFAULT NULL COMMENT 'Start date of the loan', `loan_end_date` DATE DEFAULT NULL COMMENT 'End date of the loan', `total_debt` DECIMAL DEFAULT NULL COMMENT 'Amount of debt' ) UNIQUE KEY DISTRIBUTED BY HASH BUCKETS 10 PROPERTIES ; Now, write a few new...
`demo`.`tbl` ENGINE=OLAP DUPLICATE KEY DISTRIBUTED BY HASH BUCKETS 10 PROPERTIES ; Apart from a key column, you can also specify a value column as an auto-increment column : `demo`.`tbl` NOT NULL, `value` int NOT NULL ) ENGINE=OLAP UNIQUE KEY DISTRIBUTED BY HASH BUCKETS 10 PROPERTIES ; When you ingest data into this table using an insert into statement, if the id column has no specified value in the original data file, and it will be auto-filled with auto-increment values.
`demo`.`dictionary_tbl` NOT NULL, `aid` BIGINT NOT NULL AUTO_INCREMENT ) ENGINE=OLAP UNIQUE KEY DISTRIBUTED BY HASH BUCKETS 32 PROPERTIES ; Load the existing user_id into the dictionary table, and create mappings from user_id to integer values.
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