Determine whether tables and fields exist in SQLite.

The SQLite library includes a command line called sqlite3, which allows users to manually enter and execute SQL commands for the SQLite database.

SQLite:

SQLite is a lightweight database and an ACID-compliant relational database management system. It is contained in a relatively small C library. It is a public domain project established by D. Richard Hipp.

Its design target is embedded, and it has been used in many embedded products. It takes up very low resources. In embedded devices, it may only require a few hundred K of memory. That's enough. It can support mainstream operating systems such as Windows/Linux/Unix, and can be combined with many programming languages, such as Tcl, C#, PHP, Java, etc., as well as the ODBC interface. It is also compared to the two open source programs Mysql and PostgreSQL. For the world's famous database management systems, its processing speed is faster than them all.

The first Alpha version of SQLite was born in May 2000. It has been 15 years since 2015, and SQLite has also ushered in a version. SQLite 3 has been released.