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In Object Explorer, right-click the table with columns for which you want to change the scale and select Design. Select the column for which you want to specify a default value. In the Column Properties tab, enter the new default value in the Default Value or Binding property.
Set Column Default using pgAdminIn the popup, go to 'Columns' tab and click on the edit icon againt a column to change the default value, as shown below. Now, go to the 'Constraints' tab and set or change the default value. Click on the Save button to save the changes.
you can just type " \d table_name" command , then It will displays some information about the table, such as the default value of a column. \d will show the default values of a column .
First, specify the name of the table to which the column you want to change belongs in the ALTER TABLE clause. Second, give the name of column whose data type will be changed in the ALTER COLUMN clause. Third, provide the new data type for the column after the TYPE keyword.
'SET' is forgotten
ALTER TABLE ONLY users ALTER COLUMN lang SET DEFAULT 'en_GB';
If you want to remove the default value constraint, you can do:
ALTER TABLE <table> ALTER COLUMN <column> DROP DEFAULT;
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