After completing this lesson, you should be able to do the following:
Describe the types of problems that subqueries can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
After completing this lesson, you should be able to
do the following:
Describe the types of problem that subqueries can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
http://phpexecutor.com
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After completing this lesson, you should be able to
do the following:
Identify the available group functions
Describe the use of group functions
Group data using the GROUP BY clause
Include or exclude grouped rows by using the HAVING clause
http://phpexecutor.com
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After completing this lesson, you should be able to do the following:
Describe the types of problems that subqueries can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
After completing this lesson, you should be able to
do the following:
Describe the types of problem that subqueries can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
http://phpexecutor.com
Aggregating Data Using Group FunctionsSalman Memon
After completing this lesson, you should be able to
do the following:
Identify the available group functions
Describe the use of group functions
Group data using the GROUP BY clause
Include or exclude grouped rows by using the HAVING clause
http://phpexecutor.com
Cyaniclab : Software Development Agency Portfolio.pdfCyanic lab
CyanicLab, an offshore custom software development company based in Sweden,India, Finland, is your go-to partner for startup development and innovative web design solutions. Our expert team specializes in crafting cutting-edge software tailored to meet the unique needs of startups and established enterprises alike. From conceptualization to execution, we offer comprehensive services including web and mobile app development, UI/UX design, and ongoing software maintenance. Ready to elevate your business? Contact CyanicLab today and let us propel your vision to success with our top-notch IT solutions.
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Science gateways allow science and engineering communities to access shared data, software, computing services, and instruments. Science gateways have gained a lot of traction in the last twenty years, as evidenced by projects such as the Science Gateways Community Institute (SGCI) and the Center of Excellence on Science Gateways (SGX3) in the US, The Australian Research Data Commons (ARDC) and its platforms in Australia, and the projects around Virtual Research Environments in Europe. A few mature frameworks have evolved with their different strengths and foci and have been taken up by a larger community such as the Globus Data Portal, Hubzero, Tapis, and Galaxy. However, even when gateways are built on successful frameworks, they continue to face the challenges of ongoing maintenance costs and how to meet the ever-expanding needs of the community they serve with enhanced features. It is not uncommon that gateways with compelling use cases are nonetheless unable to get past the prototype phase and become a full production service, or if they do, they don't survive more than a couple of years. While there is no guaranteed pathway to success, it seems likely that for any gateway there is a need for a strong community and/or solid funding streams to create and sustain its success. With over twenty years of examples to draw from, this presentation goes into detail for ten factors common to successful and enduring gateways that effectively serve as best practices for any new or developing gateway.
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Keep tabs on your field staff effortlessly with Informap Technology Centre LLC. Real-time tracking, task assignment, and smart features for efficient management. Request a live demo today!
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Web and Mobile App Development: From responsive websites to intuitive mobile applications, Prosigns develops cutting-edge solutions that engage users and deliver seamless experiences across devices.
AI & ML Solutions: Harnessing the power of Artificial Intelligence and Machine Learning, Prosigns provides smart solutions that automate processes, provide valuable insights, and drive informed decision-making.
Blockchain Integration: Prosigns offers comprehensive blockchain solutions, including development, integration, and consulting services, enabling businesses to leverage blockchain technology for enhanced security, transparency, and efficiency.
DevOps Services: Prosigns' DevOps services streamline development and operations processes, ensuring faster and more reliable software delivery through automation and continuous integration.
Microsoft Dynamics 365 Support: Prosigns provides comprehensive support and maintenance services for Microsoft Dynamics 365, ensuring your system is always up-to-date, secure, and running smoothly.
Learn how our collaborative approach and dedication to excellence help businesses achieve their goals and stay ahead in today's digital landscape. From concept to deployment, Prosigns is your trusted partner for transforming ideas into reality and unlocking the full potential of your business.
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2. Objectives
After completing this lesson, you should be
able to do the following:
Describe the types of problems that subqueries
can solve
Define subqueries
List the types of subqueries
Write single-row and multiple-row subqueries
3. Using a Subquery
to Solve a Problem
“Who has a salary greater than Jones’?”
“Which employees have a salary greater
than Jones’ salary?”
Main Query
?
“What is Jones’ salary?”
?
Subquery
4. Subqueries
The subquery (inner query) executes once before the main query.
The result of the subquery is used by the main query (outer query).
SELECT select_list
FROM table
WHERE expr operator
(SELECT select_list
FROM table);
5. 2975
SQL> SELECT ename
2 FROM emp
3 WHERE sal >
4 (SELECT sal
5 FROM emp
6 WHERE empno=7566);
Using a Subquery
ENAME
----------
KING
FORD
SCOTT
6. Guidelines for Using
Subqueries
Enclose subqueries in parentheses.
Place subqueries on the right side of the
comparison operator.
Do not add an ORDER BY clause to a subquery.
Use single-row operators with single-row
subqueries.
Use multiple-row operators with multiple-row
subqueries.
7. Types of Subqueries
Single-row subquery
Main query
Subquery
returns
CLERK
• Multiple-row subquery
CLERK
MANAGER
Main query
Subquery
returns
• Multiple-column subquery
CLERK 7900
MANAGER 7698
Main query
Subquery
returns
8. Single-Row Subqueries
Return only one row
Use single-row comparison operators
Operator
=
>
>=
<
<=
<>
Meaning
Equal to
Greater than
Greater than or equal to
Less than
Less than or equal to
Not equal to
10. Using Group Functions
in a Subquery
800
ENAME JOB SAL
---------- --------- ---------
SMITH CLERK 800
SQL> SELECT ename, job, sal
2 FROM emp
3 WHERE sal =
4 (SELECT MIN(sal)
5 FROM emp);
11. HAVING Clause with
Subqueries
The Oracle Server executes subqueries first.
The Oracle Server returns results into the
HAVING clause of the main query.
800
SQL> SELECT deptno, MIN(sal)
2 FROM emp
3 GROUP BY deptno
4 HAVING MIN(sal) >
5 (SELECT MIN(sal)
6 FROM emp
7 WHERE deptno = 20);
12. What Is Wrong
with This Statement?
ERROR:
ORA-01427: single-row subquery returns more than
one row
no rows selected
SQL> SELECT empno, ename
2 FROM emp
3 WHERE sal =
4 (SELECT MIN(sal)
5 FROM emp
6 GROUP BY deptno);
13. Will This Statement Work?
no rows selected
SQL> SELECT ename, job
2 FROM emp
3 WHERE job =
4 (SELECT job
5 FROM emp
6 WHERE ename='SMYTHE');
14. Multiple-Row Subqueries
Return more than one row
Use multiple-row comparison operators
Operator
IN
ANY
ALL
Meaning
Equal to any member in the list
Compare value to each value returned by
the subquery
Compare value to every value returned by
the subquery
15. Using ANY Operator
in Multiple-Row Subqueries
950
800
1100
1300
EMPNO ENAME JOB
--------- ---------- ---------
7654 MARTIN SALESMAN
7521 WARD SALESMAN
SQL> SELECT empno, ename, job
2 FROM emp
3 WHERE sal < ANY
4 (SELECT sal
5 FROM emp
6 WHERE job = 'CLERK')
7 AND job <> 'CLERK';
16. Using ALL Operator
in Multiple-Row Subqueries
2916.6667
2175
1566.6667
EMPNO ENAME JOB
--------- ---------- ---------
7839 KING PRESIDENT
7566 JONES MANAGER
7902 FORD ANALYST
7788 SCOTT ANALYST
SQL> SELECT empno, ename, job
2 FROM emp
3 WHERE sal > ALL
4 (SELECT avg(sal)
5 FROM emp
6 GROUP BY deptno);
17. Summary
Subqueries are useful when a query is
based on unknown values.
SELECT select_list
FROM table
WHERE expr operator
(SELECT select_list
FROM table);
18. Practice Overview
Creating subqueries to query values based on
unknown criteria
Using subqueries to find out what values exist
in one set of data and not in another