Sql technical questions

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how mysql optimizes distinct? : Sql dba

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What is the difference between DELETE, TRUNCATE, and DROP?

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Describe types of sql statements?

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a. Can you delete data from a View. b. If Yes, can you delete it if there are multiple tables c. If No, can you delete if there is single source table which is joining.

1 Answers   CGI,

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Explain the uses of a database trigger?

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Why is nosql good?

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4. Select sum(A.salary) +sum(B.salary) as TOT_SAL from ( select LEVEL emp_id,level*100 salary,case when mod (level,2)=0then 2 else null end dept_id from dual connect by level<6 )A right outer join (select level emp_id ,level*200 salary ,case when mod (level,3)=0 then 2 else null end dept_id from dual connect by level<6)B On A.dept_id=B.dept_id And A.emp_id=B.emp-id;

1 Answers   Fintellix,

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Can we declare a column having number data type and its scale is larger than pricesionex: column_name number(10,100),column_name numbaer(10,-84)

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Do you understand the meaning of exception handling?

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What are the dml statements?

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which tcp/ip port does sql server run on? : Sql dba

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