Group functions operate on sets of rows to aggregate data and return a single result per group. Common group functions include AVG, COUNT, MAX, MIN, and SUM. The GROUP BY clause is used to split rows into groups and is required when non-aggregate columns are selected. The HAVING clause allows filtering groups based on conditions and is analogous to the WHERE clause for rows. Nesting group functions allows aggregating aggregates, like finding the maximum average salary.
Sub query example with advantage and disadvantagesSarfaraz Ghanta
it describes about the example of the subquery with advantages as well as disadvantages.
it sows the syntax and example of thew insert , select, update, delete query.
Sub query example with advantage and disadvantagesSarfaraz Ghanta
it describes about the example of the subquery with advantages as well as disadvantages.
it sows the syntax and example of thew insert , select, update, delete query.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
2. Group Functions
What are group functions ?
Group functions operate on sets of rows to give one result per
group. These sets may be the whole table or the table split into
groups.
“maximum
salary in
the EMP table”
3. Types of Group Functions
• AVG
• COUNT
• MAX
• MIN
• SUM
Function Description
AVG(DISTINCT|ALL|n) Average value of n,
ignoring null values
COUNT({*|DISTINCT|ALL|expr}) Number of rows, where
expr evaluates to
something other than null
(Count all rows using *,
including duplicates and
rows with nulls)
MAX(DISTINCT|ALL|expr) Maximum value of expr,
ignoring null values
MIN(DISTINCT|ALL|expr) Minimum value of expr,
ignoring null values
SUM(DISTINCT|ALL|n) Sum values of n, ignoring
null values
4. Using Group Functions
Syntax:
SELECT [column, ] group_function(column)
FROM table
[WHERE condition]
[GROUP BY column]
[ORDER BY column];
5. Using AVG and SUM Functions
We can use AVG, SUM, MIN, and MAX functions against
columns that can store numeric data. The example displays
the average, highest, lowest, and sum of monthly salaries
for all salespeople.
6. Using MIN and MAX Functions
We can use MIN and MAX for any data type.
7. Using COUNT Function
COUNT(*) returns the number of rows in a table
COUNT(expr) returns the number of non-null rows.
8. Using COUNT Function (continued)
Display the number of departments in the EMP
table.
Display the number of distinct departments in the
EMP table.
9. Creating Groups of Data
We have used the group functions on the tables as one large
group of information. At times we need to divide the table
into smaller groups. This can be done by using GROUP BY
clause.
EMP
“average
salary in
EMP table
for each
department”
2916.6667
2175
1566.6667
10. Creating Groups of Data:
GROUP BY Clause
Divide rows in a table into smaller groups by using th
GROUP BY clause.
SELECT [column, ] group_function(column)
FROM table
[WHERE condition]
[GROUP BY group_by_expression]
[ORDER BY column];
group_by_expression specifies columns whose values
determine the basis for grouping
rows.
11. Using the GROUP BY Clause
All columns int the SELECT list that are not in group
functions must by in the GROUP BY clause.
The GROUP BY column does not have to be in the
SELECT list.
12. Grouping by More Than One Column
EMP
“sum salaries in
the EMP table
for each job,
grouped by
department”
• Display the total salary being paid to each job title,
within each department.
13. Using the GROUP BY Clause
on Multiple Columns
• Display the total salary being paid to each job title,
within each department.
14. Illegal Queries
Using Group Functions
Any column or expression in the SELECT list that is
not an aggregate function, must be in the GROUP BY
clause.
Display the number of employees in each
department.
15. Illegal Queries
Using Group Functions
We cannot use the WHERE clause to restrict groups.
We use the HAVING clause to restrict groups.
Display the average salaries of those departments
that have an average salary greater than $2000.
16. Excluding Group Results
In the same way that we use the WHERE clause to restrict
rows that we select, we use the HAVING clause to restrict
groups.
To find the maximum salary of each department, but show
only the departments that have maximum salary more than
$2900, we need to do the following:
Find the maximum salary for each department by grouping by
department number.
Restrict the groups to those departments with a maximum salary
greater than $2900.
18. Excluding Group Results:
Having Clause
Use the HAVING clause to restrict groups
Rows are grouped.
The group function is applied.
Groups matching the HAVING clause are displayed.
SELECT column, group_function
FROM table
[WHERE condition]
[GROUP BY group_by_expression]
[HAVING group_condition]
[ORDER BY column];
19. Using the HAVING Clause
Display department numbers and maximum salary
for those department whose maximum salary is
greater than $2900.
20. Display the job title and total monthly salary for each
job title with a total payroll exceeding $5000.
Exclude salespeople and sort the list by the total
monthly salary.
Using the HAVING Clause
22. Summary
SELECT column, group_function(column)
FROM table
[WHERE condition]
[GROUP BY group_by_expression]
[HAVING group_condition]
[ORDER BY column];
Order of evaluation of the clauses:
WHERE clause
GROUP BY clause
HAVING clause