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Showing posts with label oracle. Show all posts
Showing posts with label oracle. Show all posts

Friday, January 17, 2020

Date and Time format in SQL ?

date , Date and time formate
Date and Time format in SQL ?

Date and Time format in SQL

In SQL we have date and time format to show the date and time format in different ways lets see what are the date and time formats are there.

Date,Time,format,SQL
                               
                                                                                1.Date and Time format in SQL


FormateQuerySample
1select convert(varchar,getdate(),1)12/30/08
2select convert(varchar,getdate(),2)08.12.30
3select convert(varchar,getdate(),3)30/12/08
4select convert(varchar,getdate(),4)30.12.08
5select convert(varchar,getdate(),5)30-12-08
6select convert(varchar,getdate(),6)30 Dec 08
7select convert(varchar,getdate(),7)Dec 30 08
10select convert(varchar,getdate(),10)12-30-08
11select convert(varchar,getdate(),11)08/12/30
12select convert(varchar,getdate(),12)08 12 30
23select convert(varchar,getdate(),23)2008-12-30
101select convert(varchar,getdate(),101)12/30/2008
102select convert(varchar,getdate(),102)2008.12.30
103select convert(varchar,getdate(),103)30/12/2008
104select convert(varchar,getdate(),104)30.12.2008
105select convert(varchar,getdate(),105)30-12-2008
106select convert(varchar,getdate(),106)30 Dec 2008
107select convert(varchar,getdate(),107)Dec 30 2008
110select convert(varchar,getdate(),110)12/30/2008
111select convert(varchar,getdate(),111)2008/12/30
112select convert(varchar,getdate(),112)2008 12 30

Time only format:-

In SQL have some time only format lets see what are time format are there :-

Formate Query Sample
8 select convert(varchar,getdate(),8) 00:38:53
14 select convert(varchar,getdate(),14) 00:38:53:840
24 select convert(varchar,getdate(),24) 00:38:53
108 select convert(varchar,getdate(),108) 00:38:53
114 select convert(varchar,getdate(),114) 00:38:53:840


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Friday, January 10, 2020

SQL language Element ?

clause , constants
SQL language Element ?
SQL,element,datatype,identifiers,
                                                         1.SQL Language Element

SQL Language Element


  1. Identifiers

                      Names of database objects such as tables,views,columns,rows etc.    

      2. Datatypes      

                     
                      Define the type of data that is contain by columns.

      3.Constants


                       Symbols that represent specific data type.

      4.Operators


                       Perform arithmetic,comparison and logical operations.

      5.Function


                      There are two types of functions
                               1.Built-in function
                               2. User define  function

          1.Built-in Function

                                     Built-in  function is perform specific operations.in sql have only built-in                                               function.

          2.User define function 

                                     In this function user can create there own function but to create own function                                       they have some rules.

        6.clauses

                     Constituent component of statement and queries.
                      Example:- var clause

        7.Expression

                           Produce scalar values or tables containing of column and row of data.

        8. Queries

                       Retrieve the data based on specific criteria this is an important element of SQL.

        9.Statement

                          create database ABC
                     
                          create     :- SQL command
                          Database:-Database Keyword
                          ABC      :- User define object_name
                                                      
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What is DBMS.Advantage of DBMS.Types of DBMS.

advantage , child
What is DBMS.Advantage of DBMS.Types of DBMS.
DBMS,SQL,type if dbms,
                                            
                                                                    1.What is DBMS,Advantage,Type of DBMS

What is DBMS


  • A database management system is a software designed to assist in maintaining and utilizing large collection of data.
            Example:- Oracle,MySql,SQL.
  •  The alternative to use a DBMS is to store the data in files and write application specific to manage it.
  • DBMS allows users to create their own databases as per requirement.
  •  It provides an interface between the data and the software application.

Advantage of DBMS

  • Data independence. 
  • Efficient data access
  • Data integrity and security
  • Data Administration 
  • Concurrent access and data recovery
  • Reduce application development time

Types of DBMS 

  1. Hierarchical DBMS
  2. Network DBMS
  3. Relational DBMS
  4. Object Oriented

1.Hierarchical DBMS

  • In Hierarchical database, model data is organized in a tree like structure.
  • Data is stored hierarchically (top down or bottom down ) format .
  • Data is represented using a parent child relationship.
  • In hierarchical DBMS parent may have many children,but children have only one parent.

2.Network DBMS

  • The network database model allow each child to have multiple parents.
  • It helps you to address the need to model more complex relationship like many to many relationship.
  • In this model,entities are organized in a graph which can accessed through several paths.

3.Relational DBMS 

  • Relational DBMS is the widely used DBMS model in the industries because it is one of the easiest.
  • Relational DBMS based on the normalization data in the row and column of the tables.
  • It is stored in a fixed structures and manipulated using SQL.

4.Object Oriented 

  • In object oriented model data data stored in a form of objects. 
  • The structure we called is class we stored data within the class.
  • It define a database as a collection of objects which store both data members values and operations.

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Monday, January 6, 2020

What is SQL.Purpose of SQL.Who should learn

backend. , database
What is SQL.Purpose of SQL.Who should learn
SQL,Purpose,Learn,DBMS,RDBMS
                                                1. What is SQL and Purpose of SQL

 Introduction of SQL
  • SQL stands for structured query language. SQL was initially developed at IBM is 1970s.  
  • SQL is the the standard language to communicate with relational database management system  like oracle,MS access,MS SQL server, Mysql,Db2,Sybase etc.SQL is a command based        language.
  •  SQL is domain specific not general purpose,used in design and management of data held in       RDBMS ( Relational database management system).
  •  SQL is a command based language.
  •  SQL lets you access and manipulate databases.
  •  SQL became a standard of the american national standard institute (ANSI) in 1986,and of the    international organization for standardization(ISO) in 1987.
Purpose of SQL 
  • SQL is used to create new database.
  • SQL is used to create new tables in a database.
  • SQL is used to insert records, update records,delete record in a database.
  • SQL is used to retrieve data from database.
  • SQL can set permission on tables procedures and views.
  • SQL is used to create stored procedures in a database.
  • SQL is used to create view in a database.
Who should learn SQL


  • Database Developers.
  • Database Admistrators.(DBA)
  • Database Testers.
Database Developers:
                                      Design and deploy database table structures,forms,reports,and queries.
Database Admistrators:
                                      Keeping database upto data and  managing database access.writing reports documentation and operating manulas.
Database Testers:
  1. Verify data Integrity ( completeness and correctness of data).
  2. Verify data Manipulation (Add,Update,Delete).
  3. Verify data Comparison (two database front end data with back end data).
                             

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SEVER TYPE IN SSMS ( Sql Server Managment studio)

When you install the SQL Server management studio and then you want to connect with the SQL Server then there are four types of SQL servers ...