Re: CHANGE COLUMN DATA TYPE?

thank you Jennie El jue, 21 abr 2022 a la(s) 11:14, Ying Zhang (Y.Zhang@cwi.nl) escribió:

Hai Alberto,

Please feel free to add a feature request at https://github.com/monetdb/monetdb/issues That helps us keeping track of user wishes and plan our roadmap accordingly.

Thanks Jennie

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On 21 Apr 2022, at 15:56, Alberto Ferrari wrote:

I just found: "Change of the data type of a column is not supported. Instead use command sequence: ALTER TABLE tbl ADD COLUMN new_column _new_data_type_; UPDATE tbl SET new_column = CONVERT(old_column, _new_data_type_); ALTER TABLE tbl DROP COLUMN old_column RESTRICT; ALTER TABLE tbl RENAME COLUMN new_column TO old_column"

Maybe you could add and sql command that internally performs all those steps in just one step?

regards

El jue, 21 abr 2022 a la(s) 10:38, Alberto Ferrari (aferrari@starconnecting.com) escribió:

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Hi all, I need to change the data type of a column. (I know the trick of creating a new temp column, copy the data from old, etc...) But I expected newer versions already have a command equivalent to MySql "CHANGE COLUMN" or similar, but I can't found in monetdb documentation. All examples of "ALTER COLUMN" are for setting other attributes. Anybody knows a specific command to do what I need?

Kind regards, Alberto

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