oracle - min function in PL/SQL -

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i want choose min value in 2 date ,such 

c := min(a,b);

it occupy compiler error :

error(20,10): pls-00103: encountered symbol "," when expecting 1 of following:
. ( ) * @ % & - + / @ mod remainder rem || multiset

i know can use aggregate function min in sql. dan't whether there similar func can use pl/sql?

in plsql, least function returns smallest value in list of expressions.


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