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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T03:08:42+00:00 2026-05-25T03:08:42+00:00

Entering the following command into a PostgreSQL interactive terminal results in an error: ALTER

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Entering the following command into a PostgreSQL interactive terminal results in an error:

ALTER TABLE tbl_name ALTER COLUMN col_name varchar (11);

What is the correct command to alter the data type of a column?

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  1. Editorial Team
    Editorial Team
    2026-05-25T03:08:42+00:00Added an answer on May 25, 2026 at 3:08 am

    See documentation here: http://www.postgresql.org/docs/current/interactive/sql-altertable.html

    ALTER TABLE tbl_name ALTER COLUMN col_name TYPE varchar (11);
    
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