PL SQL- Using Dynamic SQL to Generate Delete Statements - oracle

Question

I want to create a stored procedure using PL SQL that allows me to find all tables that contain a specific column, and then delete records from those tables that have a specific value in that column.
For example, I want to find all tables that have the column "year" and then delete all records from all of those tables that have the year "2012"(this year will be a parameter that will be entered upon execution)
My attempt at this has been to create a stored procedure, use a cursor to get all of the tables that have this column of "year" and then loop through that cursor using Dynamic SQL which will generate my Delete Statements that I can execute.
CREATE OR REPLACE PROCEDURE year_deletion
(
p_year NUMBER --Input of the year for records to be deleted
)
IS
CURSOR c1 --Cursor that will find all tables that have the YEAR column
IS
SELECT owner, table_name
FROM all_tab_columns
WHERE column_name = 'YEAR'
AND owner = 'GTP';
BEGIN
FOR i IN c1 LOOP --Loop through all of the tables that the cursor found, generate a SQL statement for each table that will delete all of the records that have the year of p_year
EXECUTE IMMEDIATE ('SELECT * FROM' ||i.table_name|| 'WHERE YEAR = '||p_year||';');
END LOOP;
END;
Disclaimer: I am using a Select * From instead of a DELETE * From for testing purposes, I will change this when it this procedure executes correctly.
So far this stored procedure compiles correctly, but gives me an error during execution that a FROM keyword was expected but not found. Is this the best method to use for my purpose?

Answer 1

Is must be like this:
EXECUTE IMMEDIATE 'DELETE FROM ' ||i.table_name|| ' WHERE YEAR = :theYear' USING p_year;
Note the space after FROM and before WHERE.
You cannot simply replace DELETE by SELECT ... for testing because for SELECT you must have an INTO clause.
Your entire procedure can be like this
CREATE OR REPLACE PROCEDURE year_deletion(p_year IN NUMBER) IS
CURSOR c1 IS
SELECT owner, table_name
FROM all_tab_columns
WHERE column_name = 'YEAR'
AND owner = 'GTP';
res NUMBER;
BEGIN
FOR i IN c1 LOOP
EXECUTE IMMEDIATE
'SELECT COUNT(*) FROM ' ||i.table_name|| ' WHERE YEAR = :theYear' INTO res USING p_year;
DBMS_OUTPUT.PUT_LINE (res ||' rows will be deleted from table '||i.table_name );
EXECUTE IMMEDIATE
'DELETE FROM ' ||i.table_name|| ' WHERE YEAR = :theYear' USING p_year;
END LOOP;
END;

Answer 2

Hello you can try the below code. It will surely help you out.
CREATE OR REPLACE PROCEDURE year_deletion(
p_year IN NUMBER --Input of the year for records to be deleted
)
IS
BEGIN
FOR i IN (SELECT owner,
table_name
FROM all_tab_columns
WHERE column_name = 'YEAR'
AND owner = 'GTP')
LOOP --Loop through all of the tables that the cursor found, generate a SQL statement for each table that will delete all of the records that have the year of p_year
EXECUTE IMMEDIATE 'DELETE FROM ' ||i.table_name|| ' WHERE YEAR = '||p_year;
END LOOP;
END;