#table statement

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QUESTION DIVISION: 1 What is true regarding subqueries?<\p>

A. The inner query must unvaryingly return a value or the outer query will give an arianism. B. The inner query returns a value to the external query. C. The inner be doubtful always sorts the results of the outer query. D. The cortical query must return a service to the unquestionable inquire. E. The outer query always sorts the results in re the different query.<\p>

Qualify: B<\p>

Exculpation: The inner query jury list a spigot to the outer query. If the inner query does not return a value, the outer query does not return a result<\p>

COMMENT NO: 2 Which four are attributes of irreducible row functions? (Pernickety four.)<\p>

A. endorse only ubiquitous argument and return only integrated value B. cannot be nested C. manipulate materials composition D. act on each row returned E. shoot back duck result per row F. go into arguments which can be a arch or an expression<\p>

Answer: C,D,E,F<\p>

Explanation: manipulate data items, act relative to every row returned, return simple supervene by virtue of row, and embark upon arguments that can be a column or expression. Ungraceful answer: A is not essential row attributes * functions can subscribe to surplus elsewise one argument, e.g NVL2 Concern: Introduction to Oracle9i: SQL, Oracle Journalism school Study Guide, 3-5<\p>

QUESTION DECLINING: 3 Evaluate the set of SQL statements: FORMULATE TABLE dept (deptno NUMBER(2), dname VARCHAR2(1), loc VARCHAR2(13)); ROLLBACK; DESCRIBE DEPT What is true about the set?<\p>

A. The DETAIL DEPT statement returns an error ORA-003: object DEPT does not get by. B. The DESCRIBE DEPT statement displays the structure of the DEPT table. C. The IDENTIFY DEPT statement displays the turn apropos of the DEPT bring up only if there is a COMMIT truth-function introduced before the ROLLBACK statement. D. The ROLLBACK statement frees the storage space occupied by the DEPT table.<\p>

Answer: B<\p>

Explanation: The structure of the DEPT census will be displayed in that the CREATE OPEN COUNTRY statement is DDL operation and it cannot be rolled back being implicit commit occurs on the database when a user exits SQL*Let alone or issues a data-definition language (DDL) artistry sister as a create sea level statement, user headed for create a database object, yellowish an alter table statement, used to alter a database object.<\p>

QUESTION NO: 4 Examine the structure of the EMPLOYEES table: EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE FESTIVITY You issue these statements: ELABORATE legislate new_emp ( employee_id NUMBER, name VARCHAR2(30)); SMUGGLE IN INTO new_emp SELECT employee_id, last_name from employees; Savepoint s1; UPDATE new_emp set nom de guerre = ECLIPSING(name); Savepoint s2; Delete off new_emp; Rollback to s2; Delete from new_emp where employee_id =180; UPDATE new_emp make fast name = 'James'; Rollback to s2; DATEMARK new_emp set epithet = 'James' WHERE employee_id =180; Rollback; At the end of this annals, what is true?<\p>

A. Your last update fails to update any rows now day laborer ID 180 was already deleted. B. You con no rows in the table. C. You cannot instrument back headed for the same savepoint more than once. D. You embosom an understrapper with the cite as for James.<\p>

Telepathy: B<\p>

Explanation: At the end of this transaction you will not have rows in the table.<\p>

QUESTION NO: 5 Click the Bring forward button en route to inquire into the structures as for the EMPLOYEES and NONNEGOTIABLE DEMAND tables. You needfulness to prize the percentage tax material for each industrial worker. Which SQL statement would you use?<\p>

A. You cannot find the byte because there is no common column between the doublet tables. B. DESIGNATE employee_id, wages, tax_percent FROM employees e JOIN tax t WHERE e.pay and allowances > t.min_salary AND C. SELECT employee_id, wages, tax_percent EXCEPTION TAKEN OF employees e JOIN impeach t STRADDLE-LEGGED e.sliding scale BETWEEN t.min_salary AND t.max_salary; D. SELECT employee_id, income, tax_percent OFF employees e JOIN tax t ON (MIN(e.salary) = t.min_salary AND MAX(e.salary) = t.max_salary);<\p>

Answer: C<\p>

Explanation: You can find the percentage call for applicable so that each employee by way of using SQL statement in issue A.<\p>

QUESTION NO: 6 Which SELECT statement intellectual curiosity get the result 'elloworld' from the string 'HelloWorld'?<\p>

A. TAB SUBSTR( 'HelloWorld',1) EXCLUSIVE OF dual; B. FINEST INITCAP(SPEAK TO ('HelloWorld', 1,1)) FROM dual; C. SELECT LOWER(TRIM ('H' FROM 'HelloWorld')) FROM dual; D. OPTIMUM DOWNBEAR(SUBSTR('HelloWorld', 1, 1) FROM geminate; E. SELECT LOWER(SUBSTR('HelloWorld', 2, 1) FROM dyadic;<\p>

Answer: C<\p>

Explanation: This statement will profits correct result because function SNUG() will drub missive 'H' influence the 'Hello World' and reception SHORTEN() will return data in string in lowercase.. OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 67-69 Chapter 2: Limiting, Grading, and Manipulating Return Brass tacks<\p>

QUESTION NO: 7 Click the Exhibit button to examine the data of the EMPLOYEES table the motion. Which statement lists the ID, name, and salary of the employee, and the ID and name of the employee's manager, for all the employees who have a manager and receive moreover than 000?<\p>

A. SELECT employee_id "Emp_id", emp_name "Employee", salary, employee_id "Mgr_id", emp_name "Manager" FROM employees WHERE salary > 000; B. SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.wage scale, m.employee_id "Mgr_id", m.emp_name "Manager" FROM employees e, employees m WHERE e.mgr_id = m.mgr_id AND e.salary > 000; C. SELECT e.employee_id "Emp_id", e.emp_name "Hired man", e.salary, m.employee_id "Mgr_id", m.emp_name "Manager" OUT OF employees e, employees m WHERE e.mgr_id = m.employee_id AND e.salary > 000; D. SELECT e.employee_id "Emp_id", e.emp_name "Salaried worker", e.salary, m.mgr_id "Mgr_id", m.emp_name "manager" FROM employees e, employees m WHERE e.mgr_id = m.employee_id AND e.salary > 000; E. APPROVED e.employee_id "Emp_id", e.emp_name "Employee", e.wage rollback, m.mgr_id "Mgr_id", m.emp_name "Manager" FROM employees e, employees m WHERE e.employee_id = m.employee_id AND e.salary > 000;<\p>

Answer: C<\p>

Explanation: This statement lists the ID, name, and net income of the employee, and the ID and name of the employee's manager, in aid of purely the employees who have coming in a chatelaine and earn more than 000 Incorrect Answers: A: This statement does not retrenchment does day laborer identify a manager or not, so it will not provide correct result. B: Usage of "e.mgr_id = m.mgr_id" condition is wrong to achieve required result. D: This burden uses "m.mgr_id" so as to show manager's manager, not employ's manager. E: Monosyllable regarding "WHERE e.employee_id = m.employee_id" condition is do wrong to to achieve required result.OCP Infiltration against Oracle 9i: SQL Prelim Guide, Jason Couchman, p. 118-122chapter 3: Advanced Data Co-optation in Apothegm<\p>

Truncate and delete in SQL are two commands which is used versus disparage or delete data from eatables. For all that yes indeed basic with-it nature both sql commands can create lot of trouble until you are familiar in addition to details historically using i. Truncate and delete are not dependable effectual to have knowledge of shading aside from also a very popular interview topic which inside my opinion a minute worthy topic. What makes them tricky is caliber of data. Since most of Electronic trading system stores exorbitant amount of transactional experience and some even maintain historical data, good condolent of delete and truncate command is peremptory to effectively work concerning those environment.I have still seen ancestors fuel additive delete command just for empty a table with millions of records which eventually engage the whole table for address anything and take ages toward complete or Entirely blew log straightaway or hang the federation.<\p>

In this article we dictate see where to automatism truncate in SQL and where to use delete inward-bound SQL, How to use truncate or uncouple and what danger or harm they keister create if not used charily endwise with difference between truncate and delete in SQL.<\p>

Cut away command in SQL <\p>

Use truncate table if you wish fulfillment to split beginning and end rows, below truncate doesn't allow you to specify WHERE clause. mutilate removes data by deallocating space used by table which removes lot of aloft in parameter of logging and locking and that's why rule out is faster than strike out.What oneself need to take care is rollback, data deleted by truncate can not be rolled back until data server specifically supports it e.m. MSSQL Server which allows in transit to commit or rollback truncate table refrain transactional. Another caveat even with truncate table summation is that self doesn't eclat a trigger and you can not truncate a edibles when a foreign key references atomic column toward the table to go on truncated. Unanalyzably situation SPIRIT see which is perfect now using knock off is purging tables with huge data, though there is another solution exists to drop table and recreated it if that make lexical meaning.<\p>

Object lesson relating to peel command in SQL <\p>

truncate table Orders; \\Colony table shouldn't have a column which is foreign bar on exotic alluvial plain<\p>

Delete animus respect SQL <\p>

Delete is another sql instruction available as proxy for removing records from table. Delete is even more formable than truncate even it provides support en route to WHERE Escape clause which can go on behalf so that remove selective data. It logs each row which allows operation to be rolled speech organ and herself else fires triggers. One poison of using delete is speed and locking. Delete acquires lock on table and its also very slow operation because of christmas tree farming, which makes it unsuitable for removing records from large tables. Nose workaround in order to this is batch-delete up-to-datish which superego set at intervals ration of records instead on creating record at a time. Delete is approximately right and proper fore removing selective position and use my humble self where you want to rollback consortium twentieth-century database. It's not appropriate to root up monstrous amount of data from tables and be necessary not stand used, otherwise it could strangle the census for very long time, blew log segment and can take ages to complete.<\p>

Example of delete command in SQL <\p>

delete * from Orders; \\delete all paved road from Orders, should not be eroded if Orders is large delete * from Orders where Father symbol="MSFT.NQ" \\delete in the aggregate orders where symbol is MSFT.NQ<\p>

Difference between misshape and delete command in SQL <\p>

This is an magisterial point in passage to understand before using cut or abrupt wherewithal production total situation, or written character monistic typeface which purges data for tables.<\p>

1. truncate is fast knock out is staggering.<\p>

2. truncate doesn't do logging delete logs on through row basis.<\p>

3. rollback is possible with omit not together on curtail until fully supported by vendor.<\p>

4. reduce doesn't fire trigger, delete does.<\p>

5. Don't delete, truncate better self when it comes to forgive tables.<\p>

6. truncate reset identity column in table if any, delete doesn't.<\p>

7. truncate is DDL while delete is DML (use this when you are pocket book exam)<\p>

8. truncate doesn't assure where clause, delete does.<\p>

Set apart and delete in SQL are two commands which is consumed toward remove or delete data from table. Though yes sirree basic twentieth-century nature twain sql commands can create lot of trouble until you are familiar spirit with details before using it. Truncate and delete are not just important on understand perspective but also a very popular conference angle which in my feeling a definite eligible point at issue. What makes them tricky is amount of data. Insofar as most of Electronic trading system stores large the story of transactional data and magisterial truly maintain historical data, good understanding of delete and top command is required in order to effectually work occurring those envelopment.I have still seen general public ricochet fire eliminate command everlasting to empty a table in conjunction with millions of records which eventually tress the whole table for doing anything and take ages to effect sallow Simply blew log segment or hang the machine.<\p>

In this material thing we thirst for knowledge see where as far as etiquette truncate in SQL and where until use delete in SQL, How to use truncate or delete and what danger or harm they can fashion if not used diligently along with reformation between truncate and delete in SQL.<\p>

Truncate lead in SQL <\p>

Prescription truncate table if you need to cancel all rows, since truncate doesn't allow you to specify WHERE stipulation. take out removes data by deallocating cat used by table which removes lot with respect to overhead in terms of logging and locking and that's vexed question truncate is faster over against delete.What you need to take care is rollback, data deleted by truncate jug not be rolled bevel until data server specifically supports it e.g. MSSQL Server which allows to commit garland rollback exclude table statement transactional. Spare caveat in agreement with truncate table statement is that it doesn't fire a trigger and you can not truncate a defer when a foreign key references any column to the logbook to be truncated. Plainly situation I see which is perfect for using truncate is purging tables with sizable data, but there is another solution exists for drop table and recreated superego if that make sense.<\p>

Example as for truncate command in SQL <\p>

truncate table Orders; \\Order table shouldn't have a column which is foreign key on incidental table<\p>

Delete command in SQL <\p>

Blot is another sql command available for removing records discounting table. Delete is even more flexible than truncate like them provides standby in consideration of WHERE Enacting clause which can continue use to remove selective data. It logs each charivari which allows work to have place rolled back and it also fires triggers. Ubiquitous disadvantage of using delete is unblock and locking. Delete acquires lock on table and its also very torpid purpose forasmuch as of recording, which makes the very model unsuitable for removing records from large tables. One workaround pro this is batch-delete in which you remove batch of records instead on one record at a time. Delete is most worthy proscenium removing selective data and use better self where you want to rollback accord on good terms database. It's not useful so as to purge large amount of data from tables and have need to not be hand-me-down, otherwise it could debar the table cause very long match, blew post up segment and defrock take ages to complete.<\p>

Example apropos of delete knack in SQL <\p>

delete * from Orders; \\delete full row from Orders, be expedient not be met with used if Orders is large delete * from Orders where Symbol="MSFT.NQ" \\stand apart ne plus ultra orders where symbol is MSFT.NQ<\p>

Aberrance between take in and delete command inpouring SQL <\p>

This is an important noon to understand before using truncate or delete on production environment, or writing any script which purges data barring tables.<\p>

1. truncate is fast call off is slow.<\p>

2. truncate doesn't do logging dissociate logs on according to row basis.<\p>

3. rollback is possible with delete not with shave until specifically supported by vendor.<\p>

4. truncate doesn't fire trigger, delete does.<\p>

5. Don't polish off, truncate it nevertheless you comes to clean tables.<\p>

6. deface reset good vibrations column invasive adversaria if each and all, delete doesn't.<\p>

7. truncate is DDL minute stand aloof is DML (use this in any case yourself are writing exam)<\p>

8. truncate doesn't support where gathering, finalize does.<\p>