oracle PLS-00103 Error after executing a simple query-CodePudding

this is the code that I ran in the Oracle SQL Developer and the error has come next: It is a very simple query so what's wrong whit it?

DECLARE zero varchar(20);
DECLARE emptys;
begin
zero := '0';
emptys := null;
IF(emptys = zero)   then 
DBMS_OUTPUT.put_line('yes');
ELSE
dbms_output.Put_line('no'); 
end if;
end;

Error starting at line : 1 in command - DECLARE zero varchar(20); DECLARE emptys; begin zero := '0'; emptys := null;

IF(emptys = zero)   then 
DBMS_OUTPUT.put_line('yes');
ELSE
dbms_output.Put_line('no'); 
end if;

end;

Error report - ORA-06550: line 2, column 5: PLS-00103: Encountered the symbol "DECLARE" when expecting one of the following:

begin function pragma procedure subtype type current cursor delete exists prior The symbol "begin was inserted before "DECLARE" to continue. ORA-06550: line 13, column 74: PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following:

( begin case declare end exception exit for goto if loop mod null pragma raise return select update while with << continue close current delete fetch lock insert open rollback savepoint set sql execute commit forall merge pipe purge json_exists json_value json_query json_object json_array 06550. 00000 - "line %s, column %s:\n%s" *Cause: Usually a PL/SQL compilation error. *Action:

CodePudding user response：

DECLARE indicates the beginning of the variable declaration section. You'd only have one such section. You don't repeat that keyword for every variable you declare.

You haven't provided a data type for the variable emptys. I'll assume you want that to be varchar2(20)

DECLARE 
  zero varchar(20);
  emptys varchar2(20);
begin
  zero := '0';
  emptys := null;
  IF(emptys = zero)   then 
    DBMS_OUTPUT.put_line('yes');
  ELSE
    dbms_output.Put_line('no'); 
  end if;
end;