query all tables in Oracle - sql

Question

I have this plsql code that will give me all tables in the database with name CUSTOMERS. Now I am struck how to insert another loop in to this. I want to get the output from this code and pass it on to next loop where I want to query something like, select count(*) from Schema.customers; for each schema.
DECLARE
--c_id customers.id%type;
c_name all_tables.table_name%type;
c_tabs all_tables.owner%type;
CURSOR c_tables is
SELECT table_name, owner FROM all_tables where table_name='CUSTOMERS';
BEGIN
OPEN c_tables;
LOOP
FETCH c_tables into c_name, c_tabs;
dbms_output.put_line(c_tabs || '.' || c_name );
EXIT WHEN c_tables%notfound;
END LOOP;
CLOSE c_tables;
END;
/
------- Sample output of my code: ------------
UMICH2.CUSTOMERS
TRINITYDC.CUSTOMERS
BUFFALO.CUSTOMERS
SNOW.CUSTOMERS
PULASKITECH.CUSTOMERS
RARITANVAL.CUSTOMERS
STMARYSCA.CUSTOMERS

Answer 1

You can get the same result in a single SQL statement
SELECT table_name
,to_number
(extractvalue
(xmltype
(dbms_xmlgen.getxml
('SELECT count(*) c FROM ' || owner || '.' || table_name)
)
,'/ROWSET/ROW/C'
)
) Count
FROM all_tables
WHERE table_name = 'CUSTOMERS'

Answer 2

This way is one possibility that you can do that.
DECLARE
--c_id customers.id%type;
c_name all_tables.table_name%TYPE;
c_tabs all_tables.owner%TYPE;
v_value PLS_INTEGER;
CURSOR c_tables IS
SELECT table_name
FROM all_tables
WHERE table_name = 'CUSTOMERS';
CURSOR c_owner IS
SELECT DISTINCT owner
FROM all_tables
WHERE table_name = 'CUSTOMERS';
BEGIN
OPEN c_tables;
LOOP
FETCH c_tables INTO c_name;
OPEN c_owner;
LOOP
FETCH c_owner INTO c_tabs;
BEGIN
EXECUTE IMMEDIATE 'SELECT COUNT(1) FROM ' || c_tabs || '.' || c_name INTO v_value;
EXCEPTION
WHEN other THEN
NULL;
END;
DBMS_OUTPUT.put_line ( v_value );
EXIT WHEN c_owner%NOTFOUND;
END LOOP;
CLOSE c_owner;
DBMS_OUTPUT.put_line ( c_tabs || '.' || c_name );
EXIT WHEN c_tables%NOTFOUND;
END LOOP;
CLOSE c_tables;
END;
Any question just let me know.
Thanks.