How to get ROWID in SQLite?

In SQLite, ROWID is a special column that automatically assigns a unique identifier to each row in the table. If a table does not explicitly define a primary key column and is not created with the WITHOUT ROWID option, every table automatically includes a ROWID column. You can retrieve ROWID using the following methods:

1. Directly Query ROWID: You can directly use ROWID in a SELECT statement to fetch its value. For example, if you have a table named employees, you can query the ROWID and name of all employees as follows:

sql
SELECT ROWID, name FROM employees;

This SQL statement returns the ROWID and name fields for all rows in the employees table.

1. Using Aliases: To enhance readability, you can assign an alias to the ROWID column in your query. For example:

sql
SELECT ROWID AS id, name FROM employees;

This produces the same result, but the column header displays as id instead of ROWID.

1. Using ROWID in Conditional Statements: ROWID is highly effective in the WHERE clause for locating specific rows. For instance, if you know a particular employee's ROWID is 5, you can query their details as follows:

sql
SELECT * FROM employees WHERE ROWID = 5;

A common use case for retrieving and using ROWID is to quickly locate and update specific rows in a table, as ROWID serves as an efficient index. For example, to update the address of the employee with ROWID 5 in the employees table, execute:

sql
UPDATE employees SET address = 'New Address' WHERE ROWID = 5;

In practical applications, leveraging ROWID for operations often enhances the efficiency of database operations.