Bulk Collect Oracle - oracle

Question

Can bulk collect be done if data is getting inserted into table A from Table B and while selecting data, substr, instr, trunc functions has been used on columns fetched?
INSERT INTO A
SELECT
DISTINCT
SUBSTR(b.component, 1, INSTR(b.component, ':', 1) - 1),
TRUNC(c.end_dt, 'DDD'),
FROM
B b,
C c
WHERE
TRUNC(c.end_dt)=TRUNC(b.last_Date, 'DDD') ;
How can I insert data into table A using bulk collect?

Answer 1

The only reason you'd use Bulk Collect and FORALL to insert rows is when you absolutely need to process/insert rows in chunks. Otherwise always use SQL.
DECLARE
CURSOR c_data IS
SELECT * FROM source_tab;
--
TYPE t_source_tab IS TABLE OF source_tab%ROWTYPE;
l_tab t_source_tab;
v_limit NUMBER:= 1000;
BEGIN
OPEN c_data;
LOOP
FETCH c_data BULK COLLECT INTO l_tab LIMIT v_limit;
EXIT WHEN l_tab.count = 0;
-- Insert --
FORALL i IN l_tab.first .. l_tab.last
INSERT INTO destination_tab VALUES l_tab(i);
COMMIT;
-- prints number of rows processed --
DBMS_OUTPUT.PUT_LINE ('Inserted ' || SQL%ROWCOUNT || ' rows:');
-- Print nested table of records - optional.
-- May overflow the buffer and slow down the performance if you process many rows.
-- Use for testing only and limit the rows with Rownum or Row_Number() in cursor query:
FOR i IN l_tab.FIRST..l_tab.LAST -- or l_tab.COUNT
LOOP
DBMS_OUTPUT.PUT_LINE (l_tab(i).hire_date ||chr(9)||l_tab(i).last_name ||chr(9)||l_tab(i).first_name);
END LOOP;
END LOOP;
CLOSE c_data;
END
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