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CREATE TABLE Calendar2023 (
Date DATE PRIMARY KEY,
IsSwedishHoliday VARCHAR(3)
);

INSERT INTO Calendar2023 (Date, IsSwedishHoliday)
VALUES
('2023-01-01', 'yes'),
('2023-01-06', 'yes'),
-- Continue adding Swedish holidays with 'yes' flag

-- All other dates will have 'no' flag
('2023-01-02', 'no'),
('2023-01-03', 'no'),
-- Continue adding remaining dates with 'no' flag
;

Sure! You can create a table in SQL to store all the dates for the year 2023 and flag the Swedish holidays. Here's a step-by-step guide to doing this:

1. **Create the Table**: First, you'll need to create a table to store the dates and the flag for Swedish holidays.

sql
CREATE TABLE Dates2023 (
date DATE PRIMARY KEY,
is_swedish_holiday CHAR(3) DEFAULT 'NO'
);


2. **Insert All Dates for 2023**: You can use a loop or script to insert all the dates for 2023. Here's an example using a common table expression (CTE) to insert all the dates:

sql
WITH RECURSIVE dates AS (
SELECT '2023-01-01':: DATE AS date
UNION ALL
SELECT date + INTERVAL '1 day'
FROM dates
WHERE date < '2023-12-31'
)
INSERT INTO Dates2023 (date)
SELECT date
FROM dates;

3. **Update the Table with Swedish Holidays**: You'll need to know the specific dates for Swedish holidays in 2023. Once you have those, you can update the table to flag those dates. Here's an example:

sql
UPDATE Dates2023 SET is_swedish_holiday = 'YES' WHERE date IN (
'2023-01-01', -- New Year's Day
'2023-01-06', -- Epiphany
'2023-04-07', -- Good Friday
'2023-04-09', -- Easter Sunday
'2023-04-10', -- Easter Monday
'2023-05-01', -- Labour Day
'2023-06-06', -- National Day
'2023-06-24', -- Midsummer Day
'2023-11-01', -- All Saints' Day
'2023-12-25', -- Christmas Day
'2023-12-26' -- Boxing Day
);


Please note that the dates for some holidays like Easter and Midsummer may vary, so you'll need to verify the exact dates for 2023.

4. **Query the Table**: You can now query the table to see all the dates and whether they are Swedish holidays:

sql
SELECT * FROM Dates2023;


This will give you a complete list of dates for 2023 with a flag indicating whether or not it's a Swedish holiday.

Please replace the holiday dates in the `UPDATE` statement with the correct dates for Swedish holidays in 2023. If you need assistance in finding the exact dates for the Swedish holidays in 2023, please let me know!

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