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100 SQL Interview Questions

  • What is DBMS and RDBMS.
  • What are constraints
  • What is primary key.
  • What is unique constraint.
  • What is index, explain its different types.

Using %Type while creating plsql variable 

We can use %Type while declaring variable 

example 

declare 
v_wonum workorder.wonum%TYPE;
begin
end;

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