Author Archives: user

SQLite – UNION Clause SQLite UNION clause/operator is used to combine the results of two or more SELECT statements without returning any duplicate rows. To use UNION, each SELECT must have the same number of columns selected, the same number of column expressions, the same data type, and have them in the same order, but […]

SQLite – JOINS SQLite Joins clause is used to combine records from two or more tables in a database. A JOIN is a means for combining fields from two tables by using values common to each. SQL defines three major types of joins − The CROSS JOIN The INNER JOIN The OUTER JOIN Before we […]

SQLite – Constraints Constraints are the rules enforced on a data columns on table. These are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the database. Constraints could be column level or table level. Column level constraints are applied only […]