SQL PLSQL Interview Questions
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hi sql gurus, here is my question 4 u. i wanna use triggers for sending reminder mail to all users who are registered to the site. if any one knws the code plz send me ans here : chayabs3@gmail.com thnx advance

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..........refers to the disk mirroring

iFlex,

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there are .......different types of serializability

Wipro,

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What are the new features in Oracle 10g. Compared to Oracle 9i?

Polaris,

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How would you go about increasing the buffer cache hit ratio? 0. Explain the difference between a hot backup and a cold backup and the benefits associated with each 1. You have just had to restore from backup and do not have any control files. How would you go about bringing up this database? 2. How do you switch from an init.ora file to a spfile? 3. Explain the difference between a data block, an extent and a segment. 4. Give two examples of how you might determine the structure of the table DEPT. 5. Where would you look for errors from the database engine? 6. Compare and contrast TRUNCATE and DELETE for a table. 7. Give the reasoning behind using an index. 8. Give the two types of tables involved in producing a star schema and the type of data they hold. 9. What type of index should you use on a fact table? 10. Give two examples of referential integrity constraints. 11. A table is classified as a parent table and you want to drop and re-create it. How would you do this without affecting the children tables? 12. Explain the difference between ARCHIVELOG mode and NOARCHIVELOG mode and the benefits and disadvantages to each. 13. What command would you use to create a backup control file? 14. Give the stages of instance startup to a usable state where normal users may access it. 15. What column differentiates the V$ views to the GV$ views and how? 16. How would you go about generating an EXPLAIN plan?

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What does “select count(*) from tab” result?

Wipro, IBM, Student,

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What does “select count(1) from tab” result?

IBM,

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suppose we have a table in which 200 rows. i want to find 101 row ? what the query.... and how we find 4th and 5th highest salary and 1 to 10 highest salary

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I have 2 Databases. How can create a table in particular database? How can i know the list of tables presented each database?( in oracle 10g)

Relq,

5 5788

What is the default value of CHAR type?

Bosch,

3 6765

how many tupples can insert in 1 second in sql

1 3945

Describe the Index, Types of index, At what situation we have used? Which one s better than others?

TCS, IBM,

1 1590

why sql is used as interpreter frequently rather than a compile?

1 3676

I have a Employee table with columns ename,eid,salary,deptno. How to retrieve sum of salary for each deptno?

L&T,

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I have done oracle 10g. I need a project knowledge. So if u please send a project how it should be done,Or you can send email link. I will be very grateful to u.

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Un-Answered Questions { SQL PLSQL }

What is Temp Table and type of temp table?

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i have a column which may contain this kind of value: 123*67_80,12*8889_5,34*8_874 ,12*7_7 (can contain space before a comma, and this string length can be anything) now i want to split this value into two column like: column1: 123*67,12*8889,34*8,12*7 column2: 80,5,874,7 use function for this

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- Types of triggers - View - Dcl - Procedures, packages, functions - Metasolve - Can use Dcl in triggers - package case study - Cursor and its types - triggers schedule - Wrap - Why we are using fetch and for in cursor. difference?

528


How do you use collections in procedure to return the resultset?

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a table has 2 classifications 1)liabilities 2)earnings this liabitity has 2 elements with 2 input values and the earnings have 2 elements with 2 input values i wrote a query so that my input is liability savings amount1 amount2 xxxx null xxxxxx 0 xxx1 null xxxxx1 0 null yyyy 0 yyyy null yyy1 0 yyy1 my problem is --when i developed a report(d2k) with this data my o/p is liabilities,amount1,savings,amount2 xxxx xxxxxx xxx1 xxxxx1 yyyy yyyy yyy1 yyy1 how could i move this savings,savings values 2 palces up. can any body provide me witha better solution

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Hi, I am new in oracle(SQL), could anyone help me in writing a correct SQL. Below is the table structure. Table: Subsc Fields: 1. Sub_no (this field will hold values of subscriber nos, for e.g. S111111, S222222, S333333, S444444, etc.) 2. s_status (this field will hold values for different status of subscriber, for e.g. 'A', 'S', 'C', etc.) 3. cus_id (this field will hold values of bill nos for e.g. 11111111, 22222222, 33333333, 44444444, etc.) Table: Bill Fields: 1. Bill_no this field will hold values of bill nos for e.g. 11111111, 22222222, 33333333, 44444444, etc.) 2. b_status = (this field will hold values for different status of bill for e.g. 'O', 'C', 'S', etc.) Note: 1. The Sub_no is a Primary key of Subsc table. 2. The cus_id is a foreign in Subsc table (referred from Bill_no field of Bill table) 3. The Bill_no field is the Primary key of Bill table. Query A --> I wrote a query to select cus_id/Bill_no which is in status open (b_status = 'O') and having more than two active subscriber (i.e. S_status = 'A') in it ( i.e. more the two subscribers in same bill). select s.cus_id from subsc s where exists (select 1 from bill where bill_no = s.cus_id and b_status = 'O') and s_status = 'A' group by s.cus_id having count(sub_no) = 2 Problem : The above query will give the cus_id (or rather bill_no) which are in open status (b_status ='O) and which are having TWO ACTIVE Subscribers (s_status ='A') in it. However, this query will also lists the cus_id/bill_no which are having more than TWO subscribers in it (but only two subscriber will be in Active status (s_status = 'A') and the others will be in s_status = 'C' or s_status = 'S'. Help needed: I want to write a query which will fetch ONLY the cus_id/bill_no which are in open status (b_status ='O') and which are having ONLY TWO ACTIVE subscribers (s_status ='A') in it. B--> If I include the sub_no in the above query then NO row are returned. select s.cus_id, s.sub_no from subsc s where exists (select 1 from bill where bill_no = s.cus_id and b_status = 'O') and s_status = 'A' group by s.cus_id, s.sub_no having count(sub_no) = 2 Help needed: I want to modify the above query which will fetch ONLY the cus_id/bill_no which are in open status (b_status ='O') and which are having ONLY TWO ACTIVE subscribers (s_status ='A') in it ALONG with the sub_no. Thanks a lot in advance. Regards, Nitin

937


what are sequences

31


What will be the output of the following String S = 1+2+"abc" S = ? String S1 = 1+2+"abc"+5+6 S1 = ?

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Write a query to genarate target column.Please answer me. Advance Thanks. Src Tgt Q10 Quarter to 2010 Q90 Quarter to 1990 Q80 Quarter to 1980 Q74 Quarter to 1974

6015


Table 1: col1 Timestamp ---------------- 01-mar-2012 11:12:46 Table 2: col2 Timestamp -------------------- 01-mar-2012 11:12:10 01-mar-2012 11:11:23 Write a query to display a row with table2 col2 value less than tabl1 col1 value. Maximum timestamp value previous to table1 col1 value. Display a result as: Col1 col2 ----- ----- 01-mar-2012 11:12:46 01-mar-2012 11:12:10

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What is Materialized View? In What Scenario we Use Materialized View?

6852


Are there any features that are decommissioned in 11g that are not present in 11g?

793


in oracle 10g sw after compiling procedure how to pass parameter values ,if we (v_empid out number)how to give empid after successful compilation program.This site exact suitable for 10g with respect to question & answer same format , im trying sql browser & sql command prompt using exec procedure name & respective parameters.

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How consistent is the view of the data between and within multiple sessions, transactions or statements ?

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what is the use of anchoring object? what r the difference between anchoring object & enclosing object? can any one tell me all the details?

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