EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 360+ Courses All in One Bundle
  • Login

DB2 LUW

Home » Data Science » Data Science Tutorials » Database Management Tutorial » DB2 LUW

DB2 LUW

Definition of DB2 LUW

Basically, DB2 is a family of database management systems, in which we manage the database operation as well as store the data in huge amounts as per the user requirement. But some database application works on the specific platform this is the disadvantage of that system but DB2 luw is a cross-platform that means it is suitable for Linux, UNIX and Windows operating systems that we called as DB2 luw.DB2 luw provides some additional features such as it supports the object-relational features and non-relational data structure that normally we called JSON and XML. The DB2 luw is the most common server that operates on different operating systems.

Syntax:

Start Your Free Data Science Course

Hadoop, Data Science, Statistics & others

Normally DB2 luw is cross-platform and it supports the SQL statement, so there is multiple syntaxes available for multiple operations, so in this article, we generally talk about the aggregation functions because select statement works on luw platform and we here implement an aggregate function with the select statement as follows.

select specific function name(specified colm name) from specified table name;

Explanation

In the above syntax, we select a statement with an aggregate function because select supports the DB2 luw command server. Here specified function name means aggregate function name that we need to apply, specified colm name means actual column name from the specified table that means user-created table.

How DB2 luw works?

Now let’s see how luw works in DB2 as follows.

To see more about the working of DB2, we need to painstakingly contemplate and what are the various components that are helping to the working of DB2. Allow us to begin with the first, and that is table spaces. The table space is a capacity structure that contains tables, records, objects, and so forth the information in the data set is organized into a consistent gathering and it supports speedy recoverability of the information base and guarantees ideal space usage.

The following component is a schema which is a named object in the database and that is ordered sensibly. This component shapes the consistent design of the information stockpiling. Another component file, which is a bunch of pointers alluding to the columns of the table. These records can be special or non-novel or might be bunched or non-grouped.

So now we have perceived what the components are, DB2 works by recovering information through SQL questions from the table spaces. The outlines and files are the components that empower the simple recovery of information from the data set.

Now let’s see how the select statement works in DB2 luw as follows.

The select-statement is the type of query that can be straightforwardly determined in a DECLARE CURSOR statement or arranged and afterward referred to in a DECLARE CURSOR statement. It can likewise be given using dynamic SQL statements utilizing the order line processor (or comparative devices), causing an outcome table to be shown on the client’s screen. Regardless, the table indicated by a select-statement is the consequence of the fullselect.

A common table expression that we also called a typical table expression, which permits characterizing an outcome table with a table-name that can be determined as a table name in any FROM clause of the fullselect. Different normal table statements can be determined after the single WITH keyword. Every regular table expression determined can likewise be referred to by name in the FROM clause of ensuing normal table expression.
In the event that the list of columns is determined, it should comprise of however many names as there are columns in the outcome table of the fullselect. Every section name should be special and unfit. In the event that these segment names are not indicated, the names are obtained from the select rundown of the fullselect used to characterize the normal table expression.

In the event that the fullselect of a common table expression contains an information change-table-reference in the FROM condition, the regular table expression is said to alter information. A common table expression that changes information is constantly assessed when the proclamation is handled, whether or not the normal table articulation is utilized elsewhere in the explanation. On the off chance that there is, in any event, one common table expression that peruses or alters the information, all basic table articulations are handled in the request in which they happen, and every basic table articulation that peruses or changes information is totally executed, including all limitations and triggers, before any resulting regular table articulations are executed.

Examples

Now let’s see the different examples of select statement and aggregate functions as follows.

First, create a new table as follows.

create table comp_emp (cemp_id int not null, cemp_name varchar(30) not null,
cemp_address varchar(30) not null, cemp_salary int(256), primary key(cemp_id));

Explanation

Now insert some records into the comp_emp table by using insert into a statement, after insertion operation table content is shown in below screenshot as follows.

DB2 LUW 1

select * from comp_emp;

Now perform aggregate functions as follows.

select count(*) from comp_emp;

Explanation

In the above example, we use the select statement and count function to know the number of rows from the comp_emp table. The end out we illustrate by using the following screenshot as follows.

DB2 LUW 2

Suppose we need to calculate the sum of the cemp_salary column at that time we can use the following statement as follows.

select sum(cemp_salary) from comp_emp;

Explanation

In the above example, we use a select statement and sum function to calculate the sum of the salary column. The end out we illustrate by using the following screenshot as follows.

Popular Course in this category
Sale
SQL Training Program (7 Courses, 8+ Projects)7 Online Courses | 8 Hands-on Projects | 73+ Hours | Verifiable Certificate of Completion | Lifetime Access
4.5 (8,980 ratings)
Course Price

View Course

Related Courses
PL SQL Training (4 Courses, 2+ Projects)Oracle Training (14 Courses, 8+ Projects)

DB2 LUW 3

So in this way, we can use different aggregate functions with select and where clauses.

Advantages and Disadvantages

Now let’s see the advantages of DB2 luw.

1. It has solid reliability.
2. It is a highly manageable database.
3. It provides a cross-platform database.
4. It supports the SQL statement.
5. It provides an automatic reporting system.
6. It provides the error handling facility to the user.

Now let’s see the disadvantages of DB2 luw.

1. There are problems with search engines.
2. It required a huge memory.
3. GUI is not user-friendly as compared to other databases.
4. We need to improve the documentation in DB2 luw.

Conclusion

We hope from this article you learn the DB2 luw. From the above article, we have learned the basic syntax of DB2 luw, as well as how it works and we also see different examples of DB2 luw. From this article, we learned how and when we use the DB2 luw.

Recommended Articles

This is a guide to DB2 LUW. Here we discuss the definition, syntax, and parameters, How DB2 LUW works? examples with code implementation. You may also have a look at the following articles to learn more –

  1. DB2 Version
  2. DB2 case statement
  3. DB2 UNION
  4. DB2 Translate

All in One Data Science Bundle (360+ Courses, 50+ projects)

360+ Online Courses

50+ projects

1500+ Hours

Verifiable Certificates

Lifetime Access

Learn More

0 Shares
Share
Tweet
Share
Primary Sidebar
Database Management Tutorial
  • DB2
    • DB2? current date
    • DB2 purescale
    • DB2 backup
    • DB2 restore
    • DB2 C Express
    • DB2 Version
    • DB2? Architecture
    • DB2? Data Types
    • DB2? load
    • DB2? order by
    • DB2 date
    • DB2 NVL
    • DB2? update
    • DB2 warehouse
    • DB2 grant
    • DB2 database
    • DB2 VARCHAR
    • DB2? INSERT
    • DB2 LISTAGG
    • DB2 LIKE
    • DB2 TRUNCATE TABLE
    • DB2 LIST TABLES
    • DB2 between
    • DB2? current timestamp
    • DB2? length
    • DB2? bind
    • DB2 limit rows
    • DB2? export
    • DB2 with
    • DB2 Create Table
    • DB2 case statement
    • DB2 CAST
    • DB2 Functions
    • DB2 Date Functions
    • DB2? row_number
    • DB2 trim
    • DB2? Translate
    • DB2 UNION
    • DB2 timestamp
    • DB2? TIMESTAMPDIFF
    • DB2? replace
    • DB2 merge
    • DB2 COALESCE
    • DB2 ISNULL
    • DB2? explain
    • DB2 Join
    • DB2 alter column
    • DB2 rename column
    • DB2? Describe Table
    • DB2? rename table
    • DB2 List Databases
    • DB2 LUW
    • DB2 Query
    • DB2 GROUP BY
    • DB2 TO_DATE
    • View Serializability in DBMS
    • MariaDB Join
    • MariaDB JSON
    • MariaDB? show databases
    • Dataset Normalization
    • MariaDB Max Connections
    • jdbc connection
    • MariaDB GUI
  • DataBase Management
    • Text Data Mining
    • Roles of Database Management System in Industry
    • SQL Server Database Management Tools
    • Database administrator skills
    • Database Management Systems Advantages
    • Database Testing Interview Questions
    • Data Administrator
    • Database Administrator
    • Database Management Software
    • DataStage
    • Types of Database Models
    • Types of Database
    • Hierarchical Database Model
    • Relational Database
    • Relational Database Advantages
    • Operational Database
    • What is RDBMS?
    • What is DB2?
    • Data Masking Tools
    • Database Security
    • Data Replication
    • Bitmap Indexing
    • Second Normal Form
    • Third Normal Form
    • Fourth Normal Form
    • Data Definition Language
    • Data Manipulation Language
    • Data Control Language
    • Transaction Control Language
    • Conceptual Data Model
    • Entity-Relationship Model
    • Relational Database Model
    • Sequential File Organization
    • Checkpoint in DBMS
    • Teradata Create Table
    • Centralized Database
    • Data Storage in Database
    • Thomas write Rule
    • DBA Interview Questions
    • What is JDBC?
    • jdbc hive
    • Apriori Algorithm
    • JDBC Architecture
    • JDBC Interview Questions
    • Wildcard Characters
    • Distributed Database System
    • Multidimensional Database
  • PL/SQL
    • What is PL/SQL?
    • Careers in PL/SQL
    • PLSQL procedure
    • PL/SQL Exception
    • PL/SQL LIKE
    • PL/SQL Raise Exception
    • PLSQL rowtype
    • PLSQL? bind variables
    • PL/SQL Record
    • PL/SQL WITH
    • PL/SQL bulk collect
    • PL/SQL Block Structure
    • PL/SQL else if
    • PL/SQL nvl2
    • PL/SQL Package
    • PL/SQL exists
    • PL/SQL instr
    • PL/SQL listagg
    • PL/ SQL Formatter
    • PLSQLlength
    • PL/SQL Commands
    • PL/SQL Data Types
    • CASE statement in PL/SQL
    • PL/SQL IF Statement
    • Loops in PL/SQL
    • PL/SQL Add Column
    • For Loop in PLSQL
    • PL/SQL Cursor Loop
    • PLSQL Array
    • Cursors in PL/SQL
    • PL/SQL FOR Loop Cursor
    • PL/SQL Queries
    • PL/SQL SELECT INTO
    • PL/SQL TO_CHAR
    • PL/SQL UNION
    • PL/SQL NOT EQUAL
    • PL/SQL varray
    • PL/SQL Concatenate
    • PL/SQL UPDATE
    • PL/SQL TRIM
    • PL/SQL GROUP BY
    • PL/SQL GOTO
    • PL/SQL Date Functions
    • PL/ SQL having
    • PL/SQL to_DATE
    • PL/SQL NVL
    • PLSQL format date
    • PLSQL mod
    • PLSQL round
    • PL/SQL Boolean
    • PL/SQL exit
    • PL/SQL DECODE
    • PL/SQL ROWNUM
    • PLSQL?pivot
    • PLSQL string functions
    • PL/SQL Block
    • PL/SQL Function
    • PL/SQL Unwrapper
    • PL/SQL Table
    • PL/SQL ALTER TABLE
    • PLSQL execute immediate
    • Triggers in PL/SQL
    • PL/SQL Collections
    • PL/SQL stored procedure
    • PL/SQL Anonymous Block
    • PLSQL Interview Questions
  • TSQL Basic
    • TSQL
    • What is T-SQL
    • T-SQL Commands
    • T-SQL String Functions
    • TSQL Interview Questions
  • MariaDB
    • MariaDB Versions
    • MariaDB?list users
    • MariaDB Commands
    • MariaDB odbc
    • MariaDB Workbench
    • MariaDB for windows
    • MariaDB Server
    • MariaDB? Data Types
    • MariaDB?boolean
    • MariaDB phpMyAdmin
    • MariaDB Mysqldump
    • MariaDB Java Connector
    • MariaDB insert
    • MariaDB UPDATE
    • MariaDB? rename column
    • MariaDB AUTO_INCREMENT
    • MariaDB Timezone
    • MariaDB GROUP_CONCAT
    • MariaDB wait_timeout
    • MariaDB MaxScale
    • MariaDB? with
    • MariaDB? create?table
    • MariaDB? SHOW TABLES
    • MariaDB alter table
    • MariaDB List Tables
    • MariaDB JSON Functions
    • MariaDB Foreign Key
    • MariaDB? trigger
    • MariaDB Grant All Privileges
    • MariaDB Select Database
    • MariaDB? create database
    • MariaDB Delete Database
    • MariaDB List Databases
    • MariaDB Functions
    • MariaDB? TIMESTAMP
    • MariaDB create user
    • MariaDB add user
    • MariaDB show users
    • MariaDB Delete User
    • MariaDB? change user password
    • MariaDB? change root password
    • MariaDB reset root password
    • MariaDB IF
    • MariaDB bind-address
    • MariaDB Transaction
    • MariaDB Cluster
    • MariaDB Logs
    • MariaDB Encryption
    • MariaDB? backup
    • MariaDB Replication
    • MariaDB max_allowed_packet
    • MariaDB? performance tuning
    • MariaDB export database
    • MariaDB? import SQL
  • SQLite
    • What is SQLite
    • SQLite Commands
    • SQLite Data Types
    • SQLite COUNT
    • SQLite Boolean
    • SQLite autoincrement
    • SQLite select
    • SQLite? Bulk Insert
    • SQLite? add column
    • SQLite? concat
    • SQLite BETWEEN
    • SQLite group by
    • SQLite CASE
    • SQLite group_concat
    • SQLite array
    • SQLite? enum
    • SQLite sum
    • SQLite create table
    • SQLite Alter Table
    • SQLite Create Database
    • SQLite Delete
    • SQLite connection string
    • SQLite Database
    • SQLite Describe Table
    • SQLite Show Tables
    • SQLite exit
    • SQLite create index
    • SQLite foreign key
    • SQLite Stored Procedures
    • SQLite Extension
  • DBMS
    • Introduction To DBMS
    • DBMS ER Diagram
    • What is DBMS?
    • DBMS join
    • DBMS Functions
    • Data Administrator in DBMS
    • DBMS Canonical Cover
    • DBMS Log-Based Recovery
    • DBMS Multivalued Dependency
    • Netezza Database
    • DBMS Concepts
    • DBMS Constraints
    • DBMS_Scheduler
    • B+ Tree in DBMS
    • DBMS_LOB
    • dbms entity
    • DBMS Foreign Key
    • DBMS Users
    • DBMS_Metadata.get_ddl
    • Relational Algebra in DBMS
    • DBMS Components
    • DBMS Features
    • DBMS Models
    • DBMS Relational Model
    • Hashing in DBMS
    • DBMS network model
    • Relationship in DBMS
    • ER Model in DBMS
    • Data Models in DBMS
    • Static Hashing in DBMS
    • Advantages of DBMS
    • dbms_output.put_line
    • DBMS Data Dictionary
    • dbms_xplan.display_cursor
    • Normal Forms in DBMS
    • DBMS helps achieve
    • DBMS 3 tier Architecture
    • Relational Calculus in DBMS
    • Serializability in DBMS
    • File Organization in DBMS
    • DBMS Transaction Processing
    • States of Transaction in DBMS
    • Functional Dependency in DBMS
    • Generalization in DBMS
    • Data Independence in DBMS
    • Lock Based Protocols in DBMS
    • Deadlock in DBMS
    • Integrity Constraints in DBMS
    • Concurrency Control in DBMS
    • Validation Based Protocol in DBMS
    • DBMS Locks
    • Normalization in DBMS
    • Transaction Property in DBMS
    • Specialization in DBMS
    • Aggregation in DBMS
    • Types of DBMS

Related Courses

SQL Certification Course

PL/SQL Certification Course

Oracle Certification Course

Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Live Classes
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Database Management
  • Machine Learning
  • All Tutorials
Certification Courses
  • All Courses
  • Data Science Course - All in One Bundle
  • Machine Learning Course
  • Hadoop Certification Training
  • Cloud Computing Training Course
  • R Programming Course
  • AWS Training Course
  • SAS Training Course

© 2022 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA
Free Data Science Course

Hadoop, Data Science, Statistics & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA
Free Data Science Course

Hadoop, Data Science, Statistics & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

Let’s Get Started

By signing up, you agree to our Terms of Use and Privacy Policy.

Loading . . .
Quiz
Question:

Answer:

Quiz Result
Total QuestionsCorrect AnswersWrong AnswersPercentage

Explore 1000+ varieties of Mock tests View more

EDUCBA Login

Forgot Password?

By signing up, you agree to our Terms of Use and Privacy Policy.

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

Special Offer - SQL Certification Course Learn More