Tag:Constraints

  • SQLite introductory tutorial three or more constraints Constraints

    Time:2019-4-19

    Constraints At the end of the last essay, I mentioned constraints, but there I translated them into qualifiers, which is not very accurate. Here I should correct them first, and they should be translated into constraints more appropriately. So what are constraints? When we store data in the database, some data have obvious constraints. For […]