The event can be an inserting a record into the table, creating a new table or a user login.
Triggers are special procedures that get triggered when an event happens. In SQL Server database, you can define Constraints like Check Constraint, Default Constraint, Unique Constraint, Primary Key Constraint, Foreign Key Constraint, etc Triggers The Constrains are important to maintain the integrity of the data If the row does not honor the constraints then the SQL Server rollbacks the changes. The SQL Server enforces these rules when user inserts, updates or deletes the data. The Constrains specify the rules & restrictions that we define on the data. The SQL Server searches the index to find the row for an associated with the key. SQL Server stores these keys in a index file and in a B-tree structure. The key consists of values from or more columns in the table or view. Without index, the database engine will have to scan the entire row for each query.Īn index is built from a key. The indexes makes the retrieval of the data faster. A typical database can contain lots of such tables. The following is the Employee table from the AdventureWorks sample database Table in SQL Server Database Indexes Tables stores the data in the form of rows and columns. You can any time change the schema owner or move objects from one schema to another Tables A Schema owner owns everything that schema owns. A Typical SQL Server DatabaseĪ Schema must have a database user as an owner. Each of these schema’s contain tables, views, functions, procedures etc. The following is the Simplified view of an SQL Server database. For Example the database objects like tables, views, stored procedures etc might belong to schema’s like production, sales, HR etc It allows us to group objects into separate namespaces.
Schema is the logical container or namespace for the objects in the database. It also comes with several built-in fixed server roles. These permissions play a part in keeping SQL Server secure. We assign Permissions to roles instead of users. The SQL Server follows Role-based security. The following are some of the important objects of the SQL server database A Database much more than a simple table.