Explain the components of sql?

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Can we create foreign key without primary key?

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what happens if null values are involved in expressions? : Sql dba

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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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What is difference between left and right outer join?

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What are secondary keys?

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Which join is like an inner join?

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What is exception? What are the types of exceptions?

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what are the security recommendations while using mysql? : Sql dba

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what is the difernece between named and anonymous pl/sql blocks??

8 Answers   TCS, Wells Fargo,

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what is the maximum length of a table name, database name, and fieldname in mysql? : Sql dba

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What does partition by mean in sql?

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