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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?

1 Answer

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Try the code given below:

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

For more information, refer to this documentation: http://www.postgresql.org/docs/current/interactive/sql-altertable.html

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