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SimonWaldherrSimonWaldherr
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add date examples
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‎sql-examples/03_dates/00_date.sql

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/* Output different dates - today, current first day of the month, end of month, first of may 2022 */
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SELECT
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date('now') as "today",
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date('now','start of month') as "start of month",
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date('now','start of month','+1 month') as "end of month",
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date('2022-05-01') as "first of may 2022"

‎sql-examples/03_dates/01_timeperiods.sql

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/* Output of different time windows with description */
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SELECT
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'CM' as "period", 'current month' as "description",
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date('now','start of month') as "from",
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date('now','start of month','+1 month','-1 day') as "till"
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UNION ALL
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SELECT
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'YTM' as "period", 'year to month' as "description",
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date('now','start of year') as "from",
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date('now','start of month','-1 day') as "till"
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UNION ALL
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SELECT
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'YTD' as "period", 'year to date' as "description",
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date('now','start of year') as "from",
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date('now','-1 day') as "till"
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UNION ALL
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SELECT
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'MTD' as "period", 'month to date' as "description",
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date('now','start of month') as "from",
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date('now','-1 day') as "till"
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UNION ALL
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SELECT
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'SMPY' as "period", 'same month previous year' as "description",
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date('now','start of month','-1 year') as "from",
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date('now','start of month','+1 month','-1 day','-1 year') as "till"
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UNION ALL
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SELECT
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'PM' as "period", 'previous month' as "description",
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date('now','start of month','-1 month') as "from",
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date('now','start of month','-1 day') as "till"
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UNION ALL
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SELECT
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'PY' as "period", 'previous year' as "description",
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date('now','start of year','-1 year') as "from",
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date('now','start of year','-1 day') as "till"
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UNION ALL
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SELECT
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'PMPY' as "period", 'previous month in previous year' as "description",
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date('now','start of month','-1 month','-1 year') as "from",
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date('now','start of month','-1 day','-1 year') as "till"
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UNION ALL
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SELECT
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'365' as "period", 'last 365 days' as "description",
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date('now','-366 days') as "from",
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date('now','-1 day') as "till";

‎sql-examples/03_dates/02_calendar.sql

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/* create a table with dates from 2 years past till 1 year future */
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CREATE TEMPORARY TABLE IF NOT EXISTS calendar (
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"date" date UNIQUE NOT NULL,
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"dow" INT NOT NULL
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);
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INSERT OR ignore INTO "calendar"
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SELECT * FROM (
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WITH RECURSIVE dates(d) AS (
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VALUES(date('now','-2 year'))
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UNION ALL
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SELECT date(d, '+1 day') FROM dates WHERE d < date('now','+1 year')
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)
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SELECT d, (CAST(strftime('%w', d) AS INT) + 6) % 7 AS "dow" FROM dates
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);
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SELECT * FROM "calendar"
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ORDER BY "date" DESC
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LIMIT 0,100;

‎sql-examples/03_dates/03_groupbymonth.sql

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/* select number of days and weekdays of each month in current year */
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CREATE TEMPORARY TABLE IF NOT EXISTS calendar (
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"date" date UNIQUE NOT NULL,
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"dow" INT NOT NULL
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);
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INSERT OR ignore INTO "calendar"
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SELECT * FROM (
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WITH RECURSIVE dates(d) AS (
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VALUES(date('now','-2 year'))
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UNION ALL
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SELECT date(d, '+1 day') FROM dates WHERE d < date('now','+1 year')
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)
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SELECT d, (CAST(strftime('%w', d) AS INT) + 6) % 7 AS "dow" FROM dates
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);
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SELECT
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substr('JanFebMarAprMayJunJulAugSepOctNovDec', 1 + 3*strftime('%m', "date"), -3) as "Month",
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COUNT(*) as "Days",
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COUNT(CASE WHEN "calendar"."dow" < 5 THEN 1 END) as "Weekdays"
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FROM "calendar"
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WHERE strftime('%Y', "date") = strftime('%Y', date('now'))
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GROUP BY strftime('%m', "date")
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ORDER BY strftime('%m', "date") ASC;

‎sql-examples/03_dates/04_joincalendar.sql

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/* combine "timeperiods" example with "calendar" example */
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CREATE TEMPORARY TABLE IF NOT EXISTS calendar (
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"date" date UNIQUE NOT NULL,
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"dow" INT NOT NULL
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);
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INSERT OR ignore INTO "calendar"
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SELECT * FROM (
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WITH RECURSIVE dates(d) AS (
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VALUES(date('now','-2 year'))
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UNION ALL
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SELECT date(d, '+1 day') FROM dates WHERE d < date('now','+1 year')
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)
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SELECT d, (CAST(strftime('%w', d) AS INT) + 6) % 7 AS "dow" FROM dates
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);
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SELECT
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"period",
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"description",
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"from",
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"till",
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CAST (JulianDay("till") - JulianDay("from") as Integer) as "days",
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COUNT(CASE WHEN "calendar"."dow" < 5 THEN 1 END) as "weekdays"
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FROM (
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SELECT
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'CM' as "period", 'current month' as "description",
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date('now','start of month') as "from",
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date('now','start of month','+1 month','-1 day') as "till"
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UNION ALL
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SELECT
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'YTM' as "period", 'year to month' as "description",
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date('now','start of year') as "from",
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date('now','start of month','-1 day') as "till"
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UNION ALL
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SELECT
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'YTD' as "period", 'year to date' as "description",
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date('now','start of year') as "from",
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date('now','-1 day') as "till"
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UNION ALL
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SELECT
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'MTD' as "period", 'month to date' as "description",
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date('now','start of month') as "from",
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date('now','-1 day') as "till"
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UNION ALL
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SELECT
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'SMPY' as "period", 'same month previous year' as "description",
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date('now','start of month','-1 year') as "from",
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date('now','start of month','+1 month','-1 day','-1 year') as "till"
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UNION ALL
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SELECT
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'PM' as "period", 'previous month' as "description",
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date('now','start of month','-1 month') as "from",
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date('now','start of month','-1 day') as "till"
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UNION ALL
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SELECT
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'PY' as "period", 'previous year' as "description",
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date('now','start of year','-1 year') as "from",
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date('now','start of year','-1 day') as "till"
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UNION ALL
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SELECT
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'PMPY' as "period", 'previous month in previous year' as "description",
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date('now','start of month','-1 month','-1 year') as "from",
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date('now','start of month','-1 day','-1 year') as "till"
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UNION ALL
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SELECT
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'365' as "period", 'last 365 days' as "description",
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date('now','-366 days') as "from",
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date('now','-1 day') as "till"
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) x
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LEFT JOIN "calendar" ON "calendar"."date" BETWEEN "x"."from" AND "x"."till"
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GROUP BY "period", "description", "from", "till";

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