How to return an array from java to pl/sql?

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what is the difference between char and varchar data types? : Sql dba

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Is oracle and sql same?

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explain advantages of innodb over myisam. : Sql dba

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Why we use joins in sql?

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How to execute OS(operating system) command from pl/sql?

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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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Does pdo prevent sql injection?

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What types of commands can be executed in sql*plus?

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If i can use sys.check_constraints to display my constraints from my database using sql server 2005, how can i display then if i am using sql server 2000????

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How do I install sql?

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What is on delete set null?

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