-- Group events by hour
SELECT time_bucket(INTERVAL '1 hour', created_at) as hour_bucket, COUNT(*)
FROM events
GROUP BY hour_bucket
ORDER BY hour_bucket;

-- Group by 15-minute intervals
SELECT time_bucket(INTERVAL '15 minutes', timestamp_col), AVG(value)
FROM sensor_data
WHERE timestamp_col >= '2024-01-01'
GROUP BY 1
ORDER BY 1;

-- Format current timestamp
SELECT strftime(NOW(), '%Y-%m-%d %H:%M:%S') AS formatted_time;

-- Format timestamps in different formats
SELECT
    order_id,
    strftime(created_at, '%Y-%m-%d') AS order_date,
    strftime(created_at, '%H:%M') AS order_time,
    strftime(created_at, '%A, %B %d, %Y') AS readable_date
FROM orders;

-- Use for partitioning file exports
COPY (SELECT * FROM events WHERE event_date = '2024-01-01')
TO 's3://bucket/events/' || strftime('2024-01-01'::timestamp, '%Y/%m/%d') || '/events.parquet';

-- Parse date strings
SELECT strptime('2024-01-15 14:30:00', '%Y-%m-%d %H:%M:%S') AS parsed_timestamp;

-- Parse different formats
SELECT
    strptime('Jan 15, 2024', '%b %d, %Y') AS date1,
    strptime('15/01/2024', '%d/%m/%Y') AS date2,
    strptime('2024-01-15T14:30:00Z', '%Y-%m-%dT%H:%M:%SZ') AS iso_date;

-- Parse log timestamps
SELECT
    log_id,
    strptime(timestamp_string, '%Y-%m-%d %H:%M:%S') AS parsed_time,
    message
FROM raw_logs;

-- Get current epoch time
SELECT epoch(NOW()) AS current_epoch;

-- Convert timestamps for API usage
SELECT
    event_id,
    epoch(event_timestamp) AS epoch_seconds
FROM events;

-- Filter using epoch time
SELECT * FROM events
WHERE epoch(created_at) > 1640995200; -- After 2022-01-01

-- High-precision timestamp for JavaScript
SELECT epoch_ms(NOW()) AS timestamp_ms;

-- For time-series data
SELECT
    sensor_id,
    epoch_ms(reading_time) AS timestamp_ms,
    value
FROM sensor_readings;

-- Convert epoch milliseconds to timestamp
SELECT epoch_ms(1640995200000) AS timestamp_from_ms; -- 2022-01-01 00:00:00

-- Convert stored milliseconds back to timestamps
SELECT
    event_id,
    epoch_ms(timestamp_ms) AS event_time
FROM events;

-- Microsecond precision timestamps
SELECT epoch_us(NOW()) AS timestamp_us;

-- Nanosecond precision timestamps
SELECT epoch_ns(NOW()) AS timestamp_ns;

-- Create timestamp from current epoch microseconds
SELECT make_timestamp(epoch_us(NOW())) AS reconstructed_timestamp;

-- Create specific timestamps
SELECT make_timestamp(1640995200000000) AS new_years_2022; -- 2022-01-01 00:00:00

-- Create timestamptz from current epoch microseconds
SELECT make_timestamptz(epoch_us(NOW())) AS reconstructed_timestamptz;

-- Create specific timestamptz
SELECT make_timestamptz(1640995200000000) AS new_years_2022_tz;