Oracle PL/SQL loop issue - loops

Question

Hey guys trying to use a loop to cycle though days so my script doesn't fail the loop fails to execute each time I am not sure what I am doing wrong however i know for a fact the select statement is fine and working its just the loop i have trouble with also is it possible to have the loop check the max date in the table delete only the most recent day in case of incomplete data then add only whats needed to date?
Error line 41, column 4:
PL/SQL: ORA-00933: SQL command not properly ended
ORA-06550: line 7m Column 1:
Pl/sql statement ignored
delete Target_table
commit;
DECLARE
i_date date;
BEGIN
i_date := '01-Jan-2014';
WHILE i_date < sysdate LOOP
insert into Target_table
Select field_1,
field_2
From Data_table_1
LEFT JOIN Data_table_2
ON Data_table_1.ACCOUNT_ID=Data_table_2.account_id
Where Data_table_1.Date >= i_date
and Data_table_1.Date < i_date+1
and Data_table_1.COST_CENTRE In ('1','2','3','4','5','6','7','8','9','10')
And Data_table_1.field_3 In ('C', 'D')
And Data_table_1.field_4 Is Null
And Data_table_2.field_5 in (1,2)
END;
commit;
i_date := i_date +1;
END LOOP;
END

Answer 1

Just want to mention that the most efficent way is write the query in in SQL whenever possible, when PL/SQL can be avoided. (There is an overhead involved in the context switch between SQL and PL/SQL blocks). This is how i would write the query. The new block, using CONNECT by would generate all dates between i_date and sysdate
DECLARE
i_date DATE;
BEGIN
DELETE Target_table;
SELECT field_1,
field_2
FROM Data_table_1
JOIN (SELECT i_date + level -1 as i_date_new
FROM DUAL
CONNECT BY LEVEL<=TRUNC(sysdate)-i_date
)dates_generated
ON Data_table_1.Date_field1 >= dates_generated.i_date_new
AND Data_table_1.Date_field1 < dates_generated.i_date_new+1
LEFT JOIN Data_table_2
ON Data_table_1.ACCOUNT_ID =Data_table_2.account_id
WHERE Data_table_1.COST_CENTRE IN ('1','2','3','4','5','6','7','8','9','10')
AND Data_table_1.field_3 IN ('C', 'D')
AND Data_table_1.field_4 IS NULL
AND Data_table_2.field_5 IN (1,2);
END;

Answer 2

I have made some modifications in your code. I think this should work. I have also mentioned comments for which i have made changes.
DECLARE
i_date DATE;
BEGIN
DELETE Target_table; -- Inserted inside the Anonymous block
i_date := to_date('10-Nov-2015','DD-MON-YYYY'); -- Specified Date format
WHILE i_date < sysdate
LOOP
INSERT INTO Target_table
SELECT field_1,
field_2
FROM Data_table_1
LEFT JOIN Data_table_2
ON Data_table_1.ACCOUNT_ID =Data_table_2.account_id
WHERE Data_table_1.Date_field1 >= i_date
AND Data_table_1.Date_field1 < i_date+1
AND Data_table_1.COST_CENTRE IN ('1','2','3','4','5','6','7','8','9','10')
AND Data_table_1.field_3 IN ('C', 'D')
AND Data_table_1.field_4 IS NULL
AND Data_table_2.field_5 IN (1,2);
dbms_output.put_line(i_date);
i_date := i_date +1;
END LOOP;
COMMIT; -- Added commit at the end
END;