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sql date time

Innocent Iguana answered on February 9, 2024 Popularity 9/10 Helpfulness 4/10

answer sql date time

sql date time

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-- DATE operations (Advised : Use TIMESTAMP FORMAT instead of DATE FORMAT to acquire preciseness)
SELECT date '2005-09-11' - date '2005-09-10'; -- Result will be an integer as no of days (1)
SELECT date '2005-09-11' + integer '3'; -- Result will be a date (2005-09-14)
SELECT '2018-12-10'::DATE + '1 year 2 days 3 minutes'::INTERVAL ; -- Result will be a date

-- TIMESTAMP operations
SELECT date '2005-09-11 00:00:00' - date '2005-09-09 12:00:00'; -- Result will be an interval (1 day 12:00:00)
SELECT AGE(timestamp '2005-09-11 00:00:00', timestamp '2005-09-09 12:00:00'); -- Result will be an interval (1 day 12:00:00)
SELECT timestamp '2019-05-01' + 21 * INTERVAL '1 day';  -- Result will be a new timestamp (2019-05-22 00:00:00)
SELECT rental_date + INTERVAL '3 days' AS expected_return_date -- adding timestamp with interval = new timestamp
FROM rental;

-- Current Timestamp
SELECT NOW()::timestamp;    -- casting will cut the timezone information
SELECT CAST(NOW() as timestamp);
SELECT CURRENT_TIMESTAMP(2); -- control precision
SELECT CURRENT_DATE; -- current date
SELECT CURRENT_TIME; -- current time with timezone information

-- Extract date and time information
SELECT EXTRACT (month FROM timestamp '2005-01-24 05:12:00') AS month; -- Result will be month (1)
SELECT DATE_PART('month', timestamp '2005-01-24 05:12:00') AS month; -- Result will be month (1)
SELECT DATE_TRUNC('year', TIMESTAMP '2005-05-21 15:30:30'); -- Result will truncate to specified precision (2005-01-01 00:00:00)

-- Time Series generation
SELECT GENERATE_SERIES('2018-01-01', '2019-01-01', '1 month'::INTERVAL) - '1 day'::INTERVAL;

-- Lead and lag operations (go back or go forward in time)
SELECT date_col, lead(date_col) OVER (ORDER BY date_col) FROM table_name;
SELECT date_col, lag(date_col) OVER (ORDER BY date_col) FROM table_name;

-- String formatting of date
SELECT TO_CHAR(my_date_column, 'Month DD, YYYY') AS custom_date_format FROM my_table;
-- Reverse this process
SELECT TO_DATE('February 14, 2024', 'Month DD, YYYY') AS original_date FROM converted_table;

Popularity 9/10 Helpfulness 4/10 Language sql

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Tags: date sql time

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Contributed on Feb 09 2024

Innocent Iguana

0 Answers Avg Quality 2/10

sql date time

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