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Tag Archives: SQL Basic Concepts
How to rename a Table in Sql Server
To rename a column in a SQL Table following command can be reused: SP_RENAME ‘old table name’, ‘New table name’ For example, if we want to rename the table from employee to employeemaster, following command can be used. SP_RENAME ’employee’, ’employeemaster’ This … Continue reading
How to change the database collation
To change the collation of an database following commands can be used: ALTER DATABASE [database name] SET SINGLE_USER WITH ROLLBACK IMMEDIATE ALTER DATABASE [database name] COLLATE Newcollation ALTER DATABASE [database name] SET MULTI_USER For example , suppose if the name of your database is learningdb and you want to change the collation to the collation SQL_Latin1_General_CP1257_CI_AS, … Continue reading
ACID Rules in Sql Server
ACID Rules This article will tell about the ACID Rules in SQL Server. It is a concept for evaluation of databases and their architecture. A:- (Atomicity) – Atomicity states the principle of All or none. This means that either all the SQL Statements within … Continue reading
DML, DDL, DCL, TCL in SQL Server
Different Types of Sql Statements:- DML DML is abbreviation of Data Manipulation Language. It is used to retrieve, store, modify, delete, insert and update data in database. Examples: SELECT, UPDATE, INSERT statements Select :- This Sql Statement is used … Continue reading
Renaming a column in Sql Server
We often need to change the name of a column of a table to a new name. We can do this with the help of the Exec Sp_rename command. The Syntax of the Sp_rename is given below:- Exec sp_rename ‘TableName.[OldColumnName]’, ‘[NewColumnName]’, … Continue reading
Group by…..Having Clause
Group By:- Group By clauses is used to groups rows based on the distinct values of the specified columns. The syntax of the Group by clause is:- Select column1, column2, column3, aggregate_function(expression ) From … Continue reading
Second Normal Form (2NF)
Second Normal Form (2NF) :-A table is said to be in its Second Normal Form if it satisfied the following conditions:- 1) It satisfies the condition for the First Normal Form (1NF), 2) It do not includes any partial dependencies where a … Continue reading
Posted in SQL Normalization, SQL Server
Tagged Second Normal Form (2NF), SQL Basic Concepts, SQL Normalization
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Third Normal Form (3NF)
Third Normal Form (3NF) :- A table is said to be in the Third Normal form (3NF) if it satisfy the following conditions:- 1) It should be in the 2NF 2) It should not contain any transitive dependency which means … Continue reading
First Normal form (INF)
First Normal Form (INF) A table is said to be in a First Normal Form (1NF) if it satisfy the following conditions:- 1)If the columns of the table only contain atomic values (Single, indivisible). 2)Primary key is defined for the … Continue reading
Database Normalization
Database Normalization Normalization Database Normalization can be defined as the process of organization the data to reduce the redundant table data to the minimum. This process is carried out by dividing the database into two or more than two tables … Continue reading