ADD CONSTRAINT UC_constraint UNIQUE (ID,Name); To define a UNIQUE constraint on multiple columns: *The Unique constraint(UC) It is absolutely good practice to name your constraints. DESC constraints; ...

Mastering SQL: A Guide to the IFNULL Function The IFNULL function in SQL stands as a cornerstone for developers and analysts aiming to navigate the complexities of database management with finesse ...

Learn the basics of triggers and constraints in SQL, how they are similar and different, and how to create and apply them in your database.

Sql constraintsa constraint is a rule or limitation that we place on the data in a database that we can put into a column(s). a constraint is part of the table. we can apply constraints when we create ...

An index is a database object that speeds data retrieval by directing the DBMS to the location in storage of a particular row for a given column. Indexes are usually created with the SQL statement ...

When I am working with an Oracle database, I still find myself using SQL*Plus for many quick and dirty database queries. In particular, I often look up constraints in SQL*Plus. In this post, I ...

This project demonstrates the use of various DDL (Data Definition Language) constraints and SQL operations to manage a simple database for a sales system. Create a table named Orders with columns: ...

Cascading referential integrity constraints are foreign key constraints that tell SQL Server to perform certain actions when a primary key field in a primary key-foreign key relationship is ...