In this article, We’ll go over the different types of views in SQL Server through examples. In addition, we will learn how to create, alter, update, and delete views in SQL Server.
What is a view in SQL?
In this post, we will discuss about the different types of triggers in the SQL Server.
What is a trigger in the SQL server?
In this article, we will learn SQL Delete Cascade rules with foreign key constraints having multiple examples.
SQL Delete Cascade–Overview
1. SQL DELETE CASCADE : In the SQL server, when we create a foreign key using the SQL delete cascade option, it deletes all the related rows from the child table when the referenced row is deleted from the parent table having primary key constraint.
The following are the SQL scripts that create a parent (Departments), child (Employees) table, and a foreign key on the child table without the SQL delete cascade rule.
SQL Comparison Operators
The PRIMARY KEY constraint in SQL Server ensures that each entry in a table is uniquely recognized.
Primary keys must have UNIQUE values and cannot have NULL values.
In SQL Server, a table can only have one primary key, which can be made up of one or more columns (fields).
What is the primary key in SQL Server?
In SQL Server, a Primary Key is a field or column which uniquely identifies each and every record in a table.
- A primary key column doesn’t allow to insert null or duplicate values.
- A Primary key can consist of up to 16 columns.
- A table can have only one primary key which can be applied on single or multiple columns.
- The primary key consist of multiple columns or fields is known as the Composite primary key.
- A Primary Key constraint can be applied to the columns having any data types.
- A primary key by default creates a clustered index on the column.
A primary key can be created at the column or table level.
Syntax to create a primary key
The following are the syntax to create a primary key in SQL server.
In this article, we will discuss how to Create, Alter, and Drop a database in SQL Server.
In my previous article, we have discussed all about the Types of SQL Commands.
Database : In the SQL server a database is a place to store the data in an electronic format. It is an organized collection of database objects such as tables, views, functions, stored procedures, triggers and so on.
It allows a user to easily access or manipulate the data.
Create Database In SQL Server
In SQL Server, there are two ways to create a user-defined database, either by using the Transact-SQL statements or by using SQL Server Management Studio.
In this article, we’ll go through how to create a database in SQL Server and try and understand the different types of SQL commands. The SQL programming language supports a number of commands to perform different operations such as DCL, TCL, DQL, DDL, and DML Command.
Among other things, SQL commands can be used to create a database, create tables, add data to tables, drop tables, Alter tables, and provide access to users.