Alter Table Primary key - Crate DB

Question

I want to alter a table in my Crate DB to change the primary key constraint to add a column to the existing one. If I need to drop the constraint and create a n

Answer 1

there's no way to alter the primary key once a table has been created. You need to create a new table that has the schema you'd like to have and then either move the data over with COPY TO and COPY FROM or with insert into to_table (i) (select ... from t). With CrateDB > 2.0 it's also possible to rename tables, so you can still use the original table name.

Answer 2

First use the following code snippets for finding the constraints

SELECT Col.Column_Name from 
    INFORMATION_SCHEMA.TABLE_CONSTRAINTS Tab, 
    INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE Col WHERE 
       Col.Constraint_Name = Tab.Constraint_Name
       AND Col.Table_Name = Tab.Table_Name
       AND Constraint_Type = 'PRIMARY KEY'
       AND Col.Table_Name = '<your table name>'

Then use this to drop the constraint

ALTER TABLE Customer DROP CONSTRAINT Constraint_Name;

P.S: considering you are using SQL SERVER