Very new to SQL in general.
Have seen a few examples on how to declare table as variable in PL/SQL, however, none of them seem to do what I need.
The procedure is quite simple, check for duplicate unique numbers in a table, eg:
select unique_id,
count(unique_id) as count_unique
from table_name
having count(unique_id)>1
group by unique_id
I would like to create a procedure that can be called and dynamically change the _name and the unique_id.
Something like:
declare
table_name is table:= table_1
unique_id varchar2(100):= unique_1
begin
select unique_id,
count(unique_id) as count_unique
from table_name
having count(unique_id)>1
group by unique_id
end;
/
If you want to change the table at runtime, you'd need dynamic SQL which means that you'd need to assemble the SQL statement you want in a string variable and execute that string. If you have a procedure, you'd need that procedure to do something with the results of the query. My guess is that you want to return a cursor.
Note that I'm not doing anything to validate the table and column names to avoid SQL injection attacks. You'd probably want to use dbms_assert to validate the input rather than blindly trusting the caller.
create or replace procedure get_duplicates( p_table_name in varchar2,
p_column_name in varchar2,
p_rc out sys_refcursor )
as
l_sql varchar2(1000);
begin
l_sql := ' select ' || p_column_name || ', ' ||
' count(' || p_column_name || ') as unique_count ' ||
' from ' || p_table_name ||
' group by ' || p_column_name ||
' having count(' || p_column_name || ') > 1';
dbms_output.put_line( l_sql );
open p_rc for l_sql;
end;