Answer / barun

Function-1.function used for calculation perpose.it must
return value.(call by pl/sql code block,by sql query)

Procedure-it is used to implement business logic.it may or
not return value.it pre compile and stored in server data
base.so it is faster.(call by pl/sql code block_

trigger-it is used to implement business logic and maintain
intigrity.it cant take any para-meter like fun or
procedure.it is automatically fired(implicitely)

difference between cursor and procedure in a package

3 Answers   PCS,

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Are stored procedures faster than queries?

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what are the properties and different types of sub-queries? : Sql dba

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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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i need department wise top 2 employees salary.which logic i will use

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What is rank dense_rank and partition in sql?

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Does sql*plus have a pl/sql engine?

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What's the difference between inner join and left join?

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what is the difference between where clause and having clause? : Sql dba

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What is pl sql collection?

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How does rowid help in running a query faster?

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Is it possible to sort a column using a column alias?

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