Storing an entire column in a variable inside a stored procedure - oracle

Question

I have a complex stored procedure inside a package. Inside this SP, I need to query a table to get all the data pertaining one column and then use this to check some other condition inside an "IF" statement.
Here is what I am doing:
--declare a variable to store the holidays
l_holidays MySchema. HolidayTable.DateColumn%TYPE
-- populate this variable
Select a.DateColumn into l_holidays
from MySchema. HolidayTable a;
-- using this variable inside an "IF" statement
IF (current_Date IN l_holidays)
THEN
-- do something
ELSE
-- do something
END IF;
Every time I run this, I get the following error
ORA-01422: exact fetch returns more than requested number of rows
I know this is because I am trying to populate the entire column using the "INTO" clause. But I don't know any other way of doing it.

Answer 1

Create a collection and use BULK COLLECT INTO:
CREATE PROCEDURE my_proc (
current_date IN MySchema.HolidayTable.DateColumn%TYPE
)
AS
TYPE date_tab IS TABLE OF MySchema.HolidayTable.DateColumn%TYPE;
l_holidays date_tab;
BEGIN
SELECT DateColumn
BULK COLLECT INTO l_holidays
FROM MySchema.HolidayTable;
IF (current_Date MEMBER OF l_holidays)
THEN
NULL; -- do something
ELSE
NULL; -- do something
END IF;
END;
Otherwise you can just test in the select:
CREATE PROCEDURE my_proc (
current_date IN MySchema.HolidayTable.DateColumn%TYPE
)
AS
has_date NUMBER(1,0);
BEGIN
SELECT CASE WHEN EXISTS ( SELECT 'X'
FROM MySchema.HolidayTable
WHERE DateColumn = Current_Date )
THEN 1
ELSE 0
END
INTO has_date
FROM DUAL;
IF has_date = 1
THEN
NULL; -- do something
ELSE
NULL; -- do something
END IF;
END;

Answer 2

Hello similarly you can use this query to fulfill your requirements
SET serveroutput ON;
SET sqlbl ON;
DECLARE
type l_holiday
IS
TABLE OF DATE;
tab_holiday l_holiday;
BEGIN
SELECT a.dt BULK COLLECT
INTO tab_holiday
FROM
(SELECT SYSDATE dt FROM DUAL
UNION
SELECT SYSDATE+1 dt FROM DUAL
UNION
SELECT SYSDATE+2 dt FROM DUAL
UNION
SELECT SYSDATE+3 FROM DUAL
)a;
IF tab_holiday.COUNT > 0 THEN
IF SYSDATE MEMBER OF tab_holiday THEN
dbms_output.put_line('yes working');
ELSE
dbms_output.put_line('awsme working');
END IF;
END IF;
END;