sqlite error 21

I. ConstraintsAt the end of the previous article, I mentioned constraints,However, I have translated it into a qualifier, which is not very accurate. Here I want to correct it first. It should be more appropriate to translate it into a constraint.So

I. Constraint Constraints At the end of the last essay, I mentioned the constraint, but there I translated it as a qualifier, not too accurate, here to correct it, it should be translated into a more appropriate constraint. So what is a constraint?

SQLite database management commands 1. Create a database Start the command line and run the following command to open the shell mode CLP: Sqlite3 test. DB Although we provide the database name, if the database does not exist, SQLite does not

I. Constraints At the end of the previous article, I mentioned constraints, but I translated it into a qualifier, which is not very accurate. Here I should correct it first and translate it into constraints more appropriately. So what are

Lightweight database SQLite is developed in combination with PHP. Read the lightweight database SQLite is developed in combination with PHP. SQLite is a lightweight database and its design goal is embedded, moreover, it is already used in many

SQLite is a lightweight database. It is designed to be embedded and has been used in many embedded products. It occupies very low resources. In embedded devices, it may only take several hundred KB of memory. It supports mainstream operating systems

Data | database SQLite is a lightweight database, its design goal is embedded, and has been used in many embedded products, it occupies very low resources, in embedded devices, may only need hundreds of K of memory is enough. It can support

I believe that bloggers or passers-by who read my blog will think that SQLite is small, easy to learn, and simple. Next, I will upload my notes to my blog to help some people and myself. Because I know this is the case. A few days ago, I saw someone

SQLite is a lightweight database system similar to access, but smaller, faster, more capacity, and more concurrent. Why is SQLite most suitable for CMS (Content management system)? Not that other databases are bad, Oracle, MySQL, SQL Server are also

SQLite is a lightweight database system similar to Access, SQLite is a lightweight database system similar to Access, SQLite is a lightweight database system similar to Access, but it is smaller, faster, with larger capacity and higher