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The SQL query to retrieve data from the past six months depends on the database management system being used. Here are some examples for popular systems:

MySQL:

SELECT * FROM table_name WHERE date_column >= DATE_SUB(NOW(), INTERVAL 6 MONTH)

PostgreSQL:

SELECT * FROM table_name WHERE date_column >= NOW() - INTERVAL '6 months'

SQL Server:

SELECT * FROM table_name WHERE date_column >= DATEADD(MONTH, -6, GETDATE())

Oracle:

SELECT * FROM table_name WHERE date_column >= ADD_MONTHS(SYSDATE, -6)

Please note that the name of the table and the date column may vary depending on the specific database schema.