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Vivek johari is currently a Analyst and
have more that 5.5 yeras of experience in database. He has Master
degree in Computer and also he is Microsoft certified Sql DBA
(MCTS)& Microsoft certified SQl BI professional(MCTS). He is also
Oracle certified profession(OCP)DBA in ORACLE 10g and ORACLE 9i.He has
the experience of working in PL/SQL, T-SQL and SSIS/SSRS. His work
basically involved designing and optimization of the Database.He has
also published many database articles on his blog Technologies with Vivek Johari.
Introduction
Triggers can be defined as the database objects which perform some action for automatic execution whenever users try to do execute data modification commands (INSERT, DELETE and UPDATE) on the specified tables. Triggers are bound to specific tables. As per MSDN, triggers can be defined as the special… Read more
SQL FUNCTION: -
Function in a database can be defined as the code segment consisting of a logical group of SQL statements which takes some input arguments (if required), run in a sequential order and returns the output either in the form of a single value or in the… Read more
Sometimes our application required a database object which allows manipulation of data from a set of rows on row by row basic which means single row at a time. Cursor is the database object which solves this problem. With the use of cursor, we can fetch a sets of rows based on… Read more
ACID Rules
ACID Rules:- 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 the transaction will be executed or no Sql statement will be executed.
C:- Consistency:- Consistency… Read more
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 to extract the data from one or combination of tables Read more
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]', 'Column'
For example, suppose we have a table…Read more
Hi friends
Thank you very much for supporting this blog. It really give me lots of encouragement to share my knowledge with my friends. Due to some other high priorities, I was not able to publish any articles on this blog from last few months. But now I am busy… Read more
1. What are the Sql Joins? Sql Joins are the way to get data from many tables based on some logical conditions. The different types of Joins in Sql Server are 1) Inner join or Equi join
2) Self Join (it can be considered as the part of Inner join)Read more
1. What is the difference between the Union and Union All?
1) Union is used to select distinct data from the tables but Union All allows duplicate rows to be selected from the tables.
2) The second difference between Union and Union All can be given on the basic of… Read more
1. What is the Normalization? Normalization:-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 and defining relationship between them so that deletion,… Read more
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 TableName Where (condition) Group By Column1, column2, column3
For… Read more
Both Having Clause and Where clause is used to filter the data coming from the Select statement, but still there are some differences between them. These difference are given below:-
To show the difference between the Where Clause and the Having clause we will going to use the table EmployeeDeptInfo… Read more
Sometimes duplicate values in tables can create a major problem when we do not make a primary key or a unique key on a table. In these cases we need to find out the duplicate records and need to delete them. We can use the Having Clause to find out… Read more
Views:- View can be described as virtual table which derived its data from one or more than one table columns.It is stored in the database. It is used to implements the security mechanism in the Sql Server. For example, suppose there is table called Employeeinfo whose structure is given below:- Read more
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 column is dependent only a part of… Read more
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 that any non key column of the table should not… Read more
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 table
3)All the columns of the table are defined on the… Read more
Normalization :- 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 and defining relationship between them so that deletion, updation and insertion can… Read more
Indexes-Indexing is way to sort and search records in the table. It will improve the speed of locating and retrieval of records from the table.It can be compared with the index which we use in the book to search a particular record.
In Sql Server there are two types… Read more
Indexes-Indexing is way to sort and search records in the table. It will improve the speed of locating and retrieval of records from the table.It can be compared with the index which we use in the book to search a particular record.
In Sql Server there are two types… Read more
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