Category: SQL

What is a Constraint  A constraint is a rule that’s applied to a column or set of columns in a database table with the goal of preserving the data integrity. Constraints enforce limits on the data type and the range of values that can be used within columns. If any action violates a constraint, that action is aborted. Constraint _Description_ NOT NULL…

The SQLite library includes a simple command-line utility named sqlite3 (or sqlite3.exe on windows) that allows the user to manually enter and execute SQL commands against an SQLite database. Select statement The SELECT statement is used to query the database. The result of a SELECT is zero or more rows of data where each row has a fixed number…

SQLite features SQLite is a software library that provides a relational database management system. The “lite” in SQLite means lightweight nature regarding setup, database administration, and required resources. SQLite has the following notable features: Self-Contained SQLite is “stand-alone” or “self-contained” in the sense that it has very few dependencies. It runs on any operating system, even stripped-down bare-bones…