Having error while declaring binding variable in pl/sql - oracle

Question

Hi I am getting the error, need advise. The code is:
VARIABLE v_bind1 VARCHAR2(10); --declare bind variable
exec : v_bind1 := 'RebellionRider'; --execute it
SET SERVEROUTPUT ON;
BEGIN
dbms_output.put_line(v_bind1);
END;
It prints the below output when m trying to declare the variable:
Usage: VAR[IABLE] [ <variable> [ NUMBER | CHAR | CHAR (n [CHAR|BYTE]) |
VARCHAR2 (n [CHAR|BYTE]) | NCHAR | NCHAR (n) |
NVARCHAR2 (n) | CLOB | NCLOB | BLOB | BFILE
REFCURSOR | BINARY_FLOAT | BINARY_DOUBLE ] ]
and when tried to print it, it shows below error:
SP2-0552: Bind variable "V_BIND1" not declared.

Answer 1

You need to have the : right next to the bind name:
VARIABLE v_bind1 VARCHAR2(10); --declare bind variable
exec :v_bind1 := 'RebellionRider'; --execute it
and then reference it as :v_bind1.
For reference:
You reference bind variables in PL/SQL by typing a colon (:) followed
immediately by the name of the variable. For example

Answer 2

Assuming this is SQL*Plus and not PL/SQL Developer as the error you posted is a SQL*Plus error, it's because of the trailing comment:
Fails:
SQL> VARIABLE v_bind1 VARCHAR2(10); --declare bind variable
Usage: VAR[IABLE] [ <variable> [ NUMBER | CHAR | CHAR (n [CHAR|BYTE]) |
VARCHAR2 (n [CHAR|BYTE]) | NCHAR | NCHAR (n) |
NVARCHAR2 (n) | CLOB | NCLOB | BLOB | BFILE
REFCURSOR | BINARY_FLOAT | BINARY_DOUBLE ] ]
Succeeds:
SQL> VARIABLE v_bind1 VARCHAR2(10);
SQL>
The SQL terminator character (by default it's ; but don't forget it's configurable) must appear at the end of the line, otherwise SQL*Plus won't recognise it. But SQL*Plus commands like variable don't need a SQL terminator and don't have any comment syntax anyway, so the whole line is rejected as invalid.
The next issue you had was that v_bind1 and :v_bind1 are two different things. This fails because v_bind1 is an undeclared PL/SQL local variable (it would have needed to be declared within the block):
begin
dbms_output.put_line(v_bind1);
end;
/
What you needed was the bind variable you just declared named :v_bind1:
begin
dbms_output.put_line(:v_bind1);
end;
/
As v_ and : both indicate a variable, I'd suggest you don't need the first one.