do_execute ( 1800 cursor, statement, parameters, context 1801 ) 1803 if self. DependentObjectsStillExist Traceback (most recent call last)įile ~/.local/lib/python3.8/site-packages/sqlalchemy/engine/base.py:1799, in Connection._execute_context (self, dialect, constructor, statement, parameters, execution_options, *args, **kw) 1798 if not evt_handled: Hence, create foreign key between user_er_id to er_id. user_logins is child table to users with many to one relationship.user_login_time – TIMESTAMP defaulted to CURRENT_TIMESTAMP.Add new table user_logins with below columns and establish foreign key relationship with users.Add check constraint to user_role with ‘U’ and ‘A’ as accepted values.Add not null constraints user_email_validated, user_role, created_dt, last_updated_ts.Add unique constraint on user_email_id.Use the prior users table with out any constraints.Let us perform tasks to understand how we can use ALTER TABLE command to add or drop the constraints.Constraints from the table can be dropped using ALTER TABLE with DROP. ![]() ![]() We can specify the name using CONSTRAINT keyword.
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