What is rowid and rownum in oracle?
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What are the commands youd issue to show the explain plan for select
State the difference between a primary key and foreign key?
Why do we need integrity constraints in a database?
What is the difference between an Oracle Schema and an Oracle Instance?
What is the difference between truncate & delete command?
How can I introduce multiple conditions in like operator?
Explain what are clusters?
What is an Integrity Constrains ?
Explain overloading. Can functions be overloaded?
Give SQL Query to find the number words in a sentence ? ex: 'ram charan singh' then ans:3 Answer:select length(trim('ram charan singh')) - length (replace (trim ( 'ram charan singh'),' ','')) +1 from dual The above query working properly when space between the words is only one &similar But ,If the space between the words is nonuniform. Ex:'ram charan singh is good' ans:5 i am not getting this answer using above query.
Differnce between view and index
What is the difference between implicit index and explicit index?