The above question is about SQL Column Table Constraints. See the correct response below.
What is an SQL Column Constraint?
Constraints generally are instructions and rules that data entered onto a database must abide by. Constraints are employed to verify data. It outlines the requirements that the data must meet.
The kinds of data that can be entered into a table are restricted by constraints. This guarantees the reliability and accuracy of the data in the table.
The action is stopped if there is a contradiction between the constraint and the data action. Column-level or table-level constraints are both possible.
Which of these constraints verifies that data in a column is based on columns in other tables?
The constrain form the attached example given via the link in the question, the constraint that verifies that data in a column is based on columns in other tables is:
"VARCHAR (40)"
This kind of constraint is called an SQL CHECK Constraint. When a CHECK is put on a column, it ensures only a defined values will be able to be entered for that column.
When it is placed on a table, it serves to limit the kind of values that can enter onto certain columns based on the defined values related to other columns in the row.
Learn more about SQL Constraints at;
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