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18 lines
1.4 KiB
MySQL
18 lines
1.4 KiB
MySQL
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-- International Programmers' Day
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SELECT toDayOfYear(toDate('2018-09-13'));
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SELECT toDate('2018-09-17') AS x, toDateTime(x) AS x_t, toISOWeek(x), toISOWeek(x_t), toISOYear(x), toISOYear(x_t), toStartOfISOYear(x), toStartOfISOYear(x_t);
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SELECT toDate('2018-12-25') + number AS x, toDateTime(x) AS x_t, toISOWeek(x) AS w, toISOWeek(x_t) AS wt, toISOYear(x) AS y, toISOYear(x_t) AS yt, toStartOfISOYear(x) AS ys, toStartOfISOYear(x_t) AS yst, toDayOfYear(x) AS dy, toDayOfYear(x_t) AS dyt FROM system.numbers LIMIT 10;
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SELECT toDate('2016-12-25') + number AS x, toDateTime(x) AS x_t, toISOWeek(x) AS w, toISOWeek(x_t) AS wt, toISOYear(x) AS y, toISOYear(x_t) AS yt, toStartOfISOYear(x) AS ys, toStartOfISOYear(x_t) AS yst, toDayOfYear(x) AS dy, toDayOfYear(x_t) AS dyt FROM system.numbers LIMIT 10;
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-- ISO year always begins at monday.
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SELECT DISTINCT toDayOfWeek(toStartOfISOYear(toDateTime(1000000000 + rand64() % 1000000000))) FROM numbers(10000);
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SELECT DISTINCT toDayOfWeek(toStartOfISOYear(toDate(10000 + rand64() % 20000))) FROM numbers(10000);
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-- Year and ISO year don't differ by more than one.
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WITH toDateTime(1000000000 + rand64() % 1000000000) AS time SELECT max(abs(toYear(time) - toISOYear(time))) <= 1 FROM numbers(10000);
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-- ISO week is between 1 and 53
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WITH toDateTime(1000000000 + rand64() % 1000000000) AS time SELECT DISTINCT toISOWeek(time) BETWEEN 1 AND 53 FROM numbers(1000000);
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