sql - LPAD and RPAD on a CASE statement -

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i'm trying pad left , right of case statement 3 asterisks. runs values don't show null values. ideas? 

select p.patientfirstname || ' ' || p.patientlastname "patient"   ,case when i.insuranceid null rpad(lpad('no insurance', 3, '*'), 3, '*')  else i.insurancename   end "insurance name" patient p  full outer join insurance on (p.insuranceid = i.insuranceid);

as wrote in comment, if want constant string, use 1 , away padding:

 select p.patientfirstname || ' ' || p.patientlastname "patient"   ,case when i.insuranceid null '***no insurance***'  else i.insurancename   end "insurance name" patient p  full outer join insurance on (p.insuranceid = i.insuranceid);

padding used ensure fixed-size string when working transforming strings of variable shorter sizes. see example:

select lpad('hola',7, '*'),  lpad('namaste',7, '*'), lpad('hello',7, '*') dual;

***hola |namaste |**hello

select length(lpad('hola',7, '*')),  length(lpad('namaste',7, '*')), length(lpad('hello',7, '*')) dual;

7 |7 |7


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