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vendors pretty much sing his own praises as they yield assertions about their unusual wares, but the proof continually performs out a minute extra in the future. Claims from database giants Microsoft and Oracle for his or her respective data structures were established at recent conferences focused partly on their database applied sciences, in accordance with TechTarget newshounds returned from the Oracle OpenWorld 2018 and circulate zenith 2018 activities.
The circulate convention became outstanding for notice on Microsoft Azure SQL Database trends. it's as a result of breathe up-to-date on Dec. 1 in the benevolent of a high-conclusion free up of the Microsoft Azure SQL Database Managed illustration cloud provider, which first debuted in a established-intention version closing month.
the unusual enterprise vital free up, the commerce now admits, addresses restrictions that occupy outcome Microsoft's cloud database at a drawback versus on-premises SQL Server. This time, it is more almost equivalent on performance in comparison to the venerable on-premises database know-how.
in this podcast, Craig Stedman, senior executive editor for SearchDataManagement and TechTarget's different records and analytics web sites, outlines the development claimed for Microsoft Azure SQL Database, which comprises steer for expanded database sizes if you want to outcome it extra on par with the giant statistics stores which are usually discovered today.
Reporting on the Oracle terminate of the spectrum, Jack Vaughan, senior news creator for SearchDataManagement, referred to within the podcast that Oracle is inserting considerable attention on Oracle Cloud at customer as a means to outcome together on-premises Oracle databases for the eventual creep to cloud.
meanwhile, information managers and their company counterparts at OpenWorld were scrutinizing the vendor's self sustaining cloud functions in response to Oracle Database 18c -- with the upcoming Oracle 19c to celebrate -- as they collectively plotted their courses to the cloud.
automated indexing is next on the docket for the Oracle self sustaining Database cloud know-how -- however, as changed into evident on the convention, its develop could breathe a minute bit incremental. The podcasters agreed it'll bewitch some time for database directors (DBAs) to formally log off on the cloud edition of the Oracle database. Many DBAs harbor some issues about self reliant Database's auto-tuning and efficiency monitoring capabilities.
in the conclusion, the podcast dialogue naturally became to Amazon and its AWS cloud platform. Amazon's success within the cloud has, in no little half, spurred Oracle and Microsoft cloud efforts, both database-oriented and different.
So, when you wish to breathe Oracle certified? It’s been a controversial challenge for a long time, however one factor is bound: the Oracle Certification gives an redress measure of your technical advantage. additionally, it offers you an facet over americans competing for the database administration positions you desire.
right here is the direction to getting an Oracle Database certification:
the primary movement to getting your Oracle is buying the associate Certification, which requires that the adult clear two tests to become an Oracle certified associate (OCA). With this qualification, that you could toil in junior database administration as a team member or an software developer. To Get the affiliate certification, you ought to pass in a single of the three tests explained under and the closing “Oracle Database 11g: Administration I” examination.
Take certainly one of here three classes
Oracle Database 12c: SQL Fundamentals (1Z0–061)
The exam exams competencies to create, Get better, retain and edit facts in a database. in particular, this includes a bewitch hold of of crucial database administration ideas such as the relational database. moreover, the need to tolerate in mind and utilize SQL is tremendous, as the check will require you to exhibit your SQL programming competencies.
Oracle Database SQL (1Z0–071)
In regularly occurring, this is a superior version of the Oracle 1Z0–047 examination. you will want faculty in fifty three topics to rating in this exam. You deserve to occupy a better talents of schema objects, manage transactions, and exploit statistics the utilize of subqueries. The questions require the abysmal understanding of SQL, and are dissimilar elements in nature, requiring an application of ideas in condition of minor memorization of solutions. adventure in database administration will give you a exceptional competencies during this examination.
Oracle Database 11g: SQL Fundamentals I (1Z0–051)
This verify is an upgraded version of the “Introduction to Oracle9i SQL” examine. The content is extra fresh and covers set and conditional operators, which are absent within the older version. for this reason, you can breathe choosing this verify over the previous.
Oracle Database 11g: Administration I (1Z0–052)
The exam needs skills on a pass to deploy database environments and guarded Oracle situations in any network environment. different ideas required to pass this examination encompass the realizing of database backup and recovery, Oracle Database structure, as well as the configuration of protection occurrences. The questions want utility of ideas, not simply memorization of information.
The skilled certification concedes you to control gigantic databases and develop significant-scale database applications. In abstract, to become an Oracle certified skilled (OCP), you ought to bewitch an teacher-led direction, an exam and a hands-on direction.
Be an Oracle licensed associate
You should want the OCA certification as a pre-requisite for this certification.
Take an examination
The 2nd trail within the OCP certification process is to bewitch a course from a decision of round 50 certifications and sit down an examination. The checklist of those courses is attainable on the Oracle website. The huge selection potential that you should elect the path that most closely fits your training requirements. celebrate that you simply can not meet the needs of this route through self-study; you need to bewitch an teacher-led classification, a digital category or breathe taught via training-on-demand.
Submission of an Already accomplished Certification
during this step, you are expected to publish a in the past completed direction from a list of 21 Certifications. then again, Oracle makes it workable for submissions from classes taken within the faded step.
Oracle Database 11g: Administration II (1Z0–053)
here is the final examination in the OCP certification technique. when you pass this examination, that you could boost to the closing method.
submit a direction completion form
once you clear this exam, you just need to finished a path submission because the final step in the OCP certification manner.
this is the optimum-stage Oracle certification which you could get. With this qualification, you are going to smartly-suitable to toil in senior-levels in IT departments managing sensitive database system problems and purposes. You would require an OCP certification to Get begun. After that, you'll seize a two-day examination and then a arms-on course.
obtain an OCP Certification
The Oracle certified master (OCM) wants you first to Get the OCP certification.
comprehensive two advanced courses
The next step in grasp certification is the completion of two lessons from a list of over 30 certifications. Some of those certifications can also correspond with those allowed within the OCP certification method. nevertheless, those managed to Get the OCP certification cannot breathe used through this step to fulfill the OCM necessities. moreover, as with the OCP certification lessons, you must bewitch these classes in classification, during the digital level, or through working towards on demand.
publish a accomplished Certification
This degree is additionally plenty dote its OCP equal in so you might outcome up an archived certification from a listing of just about 20 certifications given or a path from the record offered within the previous step.
here is the closing examination within the grasp certification procedure. Passing this exam completes the studying needs for the complete Oracle certification process. however, there are a number of lesser steps required to Get the OCM certification.
Fill a Certification Submission kind
You must outcome up this profile to ascertain that you've accomplished entire of the certifications required to Get the Oracle certified grasp qualification.
Submission of a Fulfilment package Request
This benevolent is also introduced in addition to the course submission benevolent and is the remaining requirement for the master Certification technique.
on the end:
In average, Oracle licensed database administrators occupy the recognize-a pass to speed databases both on the junior and senior-stages, counting on the certification level. Some individuals could pretension that there is minute aspect to staying licensed, because the system includes the memorization of abstract ideas and taking a distinctive option view at various. although, while there's self faith within the indisputable fact that certification does minute to atone for the inability of technical competence got through event, it does supply validity to such claims. As an Oracle certified database administrator, learning employers and valued clientele are extra with no rigor satisfied of your capabilities in the field.
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So, should you want to breathe Oracle Certified? It’s been a debatable issue for a while, but one thing is sure: the Oracle Certification gives an accurate measure of your technical expertise. Additionally, it gives you an edge over people competing for the database administration positions you desire.
Here is the path to getting an Oracle Database certification:
The first creep to getting your Oracle is acquiring the Associate Certification, which requires that the person clear two tests to become an Oracle Certified Associate (OCA). With this qualification, you can toil in junior database management as a team member or an application developer. To Get the associate certification, you occupy to pass in one of the three tests explained below and the final “Oracle Database 11g: Administration I” exam.
Take one of the following three courses
Oracle Database 12c: SQL Fundamentals (1Z0–061)
The exam tests learning to create, recover, maintain and edit data in a database. Mainly, this involves a clutch of crucial database administration concepts such as the relational database. Additionally, the need to understand and utilize SQL is significant, as the test will require you to demonstrate your SQL programming skills.
Oracle Database SQL (1Z0–071)
In general, this is a superior version of the Oracle 1Z0–047 exam. You will need faculty in 53 topics to score in this exam. You need to occupy a higher learning of schema objects, Control transactions, and exploit data using subqueries. The questions require the abysmal understanding of SQL, and are multiple parts in nature, requiring an application of concepts rather than minor memorization of answers. undergo in database administration will give you a notable handicap in this exam.
Oracle Database 11g: SQL Fundamentals I (1Z0–051)
This test is an upgraded version of the “Introduction to Oracle9i SQL” test. The content is more recent and covers set and conditional operators, which are absent in the older version. Therefore, you would breathe better off choosing this test over the former.
Oracle Database 11g: Administration I (1Z0–052)
The exam needs learning on how to set up database environments and protected Oracle situations in any network environment. Other concepts required to pass this exam embrace the understanding of database backup and recovery, Oracle Database Architecture, as well as the configuration of security occurrences. The questions need application of concepts, not just memorization of information.
The professional certification concedes you to manage great databases and develop large-scale database applications. In summary, to become an Oracle Certified Professional (OCP), you occupy to bewitch an instructor-led course, an exam and a hands-on course.
Be an Oracle Certified Associate
You must need the OCA certification as a pre-requisite for this certification.
Take an Exam
The second trail in the OCP certification process is to bewitch a course from a option of around 50 certifications and sit an exam. The listing of these courses is accessible on the Oracle site. The broad selection means that you can elect the path that best suits your training requirements. Note that you cannot meet the needs of this course through self-study; you occupy to bewitch an instructor-led class, a virtual class or learn through training-on-demand.
Submission of an Already Completed Certification
In this step, you are expected to submit a previously completed course from a list of 21 Certifications. Alternatively, Oracle allows submissions from courses taken in the previous step.
Oracle Database 11g: Administration II (1Z0–053)
This is the final exam in the OCP certification process. Once you pass this exam, you can forward to the final process.
Submit a course completion form
Once you clear this exam, you just occupy to complete a course submission as the final step in the OCP certification process.
This is the highest-level Oracle certification you can get. With this qualification, you will well-suited to toil in senior-levels in IT departments managing sensitive database system problems and applications. You will require an OCP certification to Get started. After that, you will entangle a two-day exam and then a hands-on course.
Obtain an OCP Certification
The Oracle Certified Master (OCM) needs you first to Get the OCP certification.
Complete two advanced courses
The next step in master certification is the completion of two courses from a list of over 30 certifications. Some of these certifications may correspond with those allowed in the OCP certification process. Nevertheless, those managed to Get the OCP certification cannot breathe used through this step to meet the OCM requirements. Additionally, as with the OCP certification courses, you occupy to bewitch these courses in class, through the virtual level, or by training on demand.
Submit a Completed Certification
This smooth is also much dote its OCP equal in that you can submit an archived certification from a list of almost 20 certifications given or a course from the list provided in the previous step.
This is the final exam in the master certification process. Passing this exam completes the learning necessities for the entire Oracle certification process. However, there are a few lesser steps required to Get the OCM certification.
Fill a Certification Submission Form
You occupy to submit this profile to authenticate that you occupy completed entire the certifications required to Get the Oracle Certified Master qualification.
Submission of a Fulfilment Kit Request
This profile is also presented in addition to the course submission profile and is the final requirement for the Master Certification process.
At The End:
In common, Oracle Certified database administrators occupy the know-how to speed databases both at the junior and senior-levels, depending on the certification level. Some people might pretension that there is minute point to staying certified, as the process includes the memorization of abstract concepts and taking a multiple option test. However, while there is self-possession in the fact that certification does minute to compensate for the want of technical competence obtained through experience, it does give validity to such claims. As an Oracle Certified database administrator, potential employers and clients are more easily convinced of your capabilities in the field.
Need serve preparing for your next Oracle certification exam? This is the third in their train of six Oracle certification quizzes, courtesy of Oracle expert Matthew Morris.
SQL, or Structured Query Language, is essential for managing data in a relational database management system (RDBMS). Oracle has been the leading player in the RDBMS game for quite a while now, and while you may occasionally hear opinions to the contrary, that position of preeminence is likely to remain secure in the foreseeable future.
Oracle certification expert Matthew Morris has created a train of drill tests at his site, Oracle Certification Prep. These free drill questions are a sampling of what you'll find there. After you try these questions, visit Oracle Certification Prep for (paid) access to a plenary 1Z0-051: Oracle Database 11g: SQL Fundamentals I drill test.
Ready to rumble? Simply scroll down the page to initiate your quiz. Or check out their other free Oracle quizzes.
Note: Your browser must permit multiple dialog boxes per page in order to complete this quiz.
Which of the following statements about single-row functions is correct?
OCA Oracle Database 11g: SQL Fundamentals I Exam GuideChapter 8: Using Subqueries to resolve Problems
A subquery is a query that is nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. This chapter from OCA Oracle Database 11g: SQL Fundamentals I Exam steer explains the places in a query where a subquery may breathe used and which clauses are optional and required. Read the chapter to better understand the subquery definition.
OCA Oracle Database 11g: SQL Fundamentals I Exam Guide, Chapter 8
Table of contents:
Define SQL subqueriesUsing subqueries in SQLList the types of SQL subqueriesWriting single-row and multiple-row subqueries
This chapter is the first of two that exhibit how two or more SELECT commands can breathe combined into one statement. The first technique (covered in this chapter) is the utilize of subqueries. A subquery is a SELECT statement whose output is used as input to another SELECT statement (or indeed to a DML statement, as done in Chapter 10). The second technique is the utilize of set operators, where the results of several SELECT commands are combined into a single result set.
Define SQL subqueries
A subquery is a query that is nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. A subquery can recur a set of rows or just one row to its parent query. A scalar subquery is a query that returns exactly one value: a single row, with a single column. Scalar subqueries can breathe used in most places in a SQL statement where you could utilize an expression or a literal value.
The places in a query where a subquery may breathe used are as follows:
In the SELECT list used for column projection
In the FROM clause
In the WHERE clause
In the HAVING clause
A subquery is often referred to as an inner query, and the statement within which it occurs is then called the outer query. There is nothing wrong with this terminology, except that it may imply that you can only occupy two levels, inner and outer. In fact, the Oracle implementation of subqueries does not impose any practical limits on the smooth of nesting: the depth of nesting permitted in the FROM clause of a statement is unlimited, and that in the WHERE clause is up to 255.
A subquery can occupy any of the habitual clauses for selection and projection. The following are required clauses:
A SELECT list
A FROM clause
The following are optional clauses:
The subquery (or subqueries) within a statement must breathe executed before the parent query that calls it, in order that the results of the subquery can breathe passed to the parent.
EXERCISE 8-1 Types of Subqueries
In this exercise, you will write code that demonstrates the places where subqueries can breathe used. utilize either SQL*Plus or SQL Developer. entire the queries should breathe speed when connected to the HR schema.
Log on to your database as user HR.
Write a query that uses subqueries in the column projection list. The query will report on the current numbers of departments and staff:
select sysdate Today,
(select count(*) from departments) Dept_count,
(select count(*) from employees) Emp_count
Write a query to identify entire the employees who are managers. This will require using a subquery in the WHERE clause to select entire the employees whose EMPLOYEE_ID appears as a MANAGER_ID:
select last_name from employees where
(employee_id in (select manager_id from employees));
ch08.indd 359 4/28/08 10:48:49 AM
Write a query to identify the highest salary paid in each country. This will require using a subquery in the FROM clause:
select max(salary),country_id from
(select salary,department_id,location_id,country_id from
employees natural associate departments natural associate locations)
group by country_id;
Download the chapter "Using Subqueries to resolve Problems", which includes drill exercises and a self-test, in PDF form.
Continue to the next section: Using subqueries in SQL
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