1. Press Windows Key + X key and click on Command Prompt (Admin) from the task list. 2. Right-click Command Prompt from the start search list and then click Run as administrator. Note: If you are prompted for an administrator password or for a confirmation, type the password, or click Allow. 3.
A constraint is anything that prevents the system from achieving its goal. There are many ways that constraints can show up, but a core principle within TOC is that there are not tens or hundreds of constraints. There is at least one but at most only a few in any given system.
SQL Constraints. SQL constraints are used to specify rules for the data in a table. If there is any violation between the constraint and the data action, the action is aborted by the constraint.Constraints can be specified when the table is created (inside the CREATE TABLE statement) or after the table is created (inside the ALTER TABLE statement).f there is any violation between the constraint and the data action, the action is aborted by the constraint. Constraints can be specified when the table is created (inside the CREATE TABLE statement) or after the table is created (inside the ALTER TABLE statement).