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How Can We Help? Search Print How to copy a columns data from one table into a column in another table using PostgreSQL? Eg. name columns data from the users table into namecolumn in the new_users table. Execute the query below with different column names and table names and all the data for a specific column will be copied over to the selected column in another table. INSERT INTO...

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Print Use the following statement

ALTER TABLE my_table DROP COLUMN my_column;

Replace my_table with the your table name and my_column with the column that you need to drop/remove.

How Can We Help? Search Print Unfortunately Postgresql does not have Auto Increment columns so instead we create a Sequence that will act as a counter First we’ll need to create a sequence that we want to attch to our table CREATE SEQUENCE mytable_primary_id_seq; Then we need to assign the sequence to the column in our table that will act as the Autoincrement column ALTER TABLE mytable    ...

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Print Execute the following command

ALTER TABLE your_table ALTER COLUMN your_column DROP DEFAULT;

Replace your_table with the table and your_column with the column name where you wish to remove the default value
The above command is the same as setting the DEFAULT to NULL

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Print ALTER TABLE users ADD COLUMN fax int, ADD COLUMN phone int;

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Print ALTER TABLE tablename RENAME COLUMN oldColumnName TO newColumnName;

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Print Run the following command:

alter table TABLE_NAME alter column COLUMN_NAME type character varying(120);

This will extend the character varying column field size to 120.
Remember to change TABLE_NAME to the relevant table name and COLUMN_NAME to the relevant column name.

How Can We Help? Search Print Log into the PostgreSQL interface on the command line, you should see a similar screen like the one below Welcome to psql 8.1.21, the PostgreSQL interactive terminal.   Type:  \copyright for distribution terms        \h for help with SQL commands        \? for help with psql commands        \g or terminate with semicolon to execute query        \q to quit  ...

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Print Run the following command

alter table TABLE_NAME alter column COLUMN_NAME type character varying(120);

This will extend the character varying column field size to 120.
Remember to change TABLE_NAME to the relevant table name and COLUMN_NAME to the relevant column name.