mirror of
https://github.com/ClickHouse/ClickHouse.git
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40 lines
1.3 KiB
MySQL
40 lines
1.3 KiB
MySQL
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-- Before UNIX epoch
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WITH
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toDateTime64('1959-09-16 19:20:12.999999998', 9, 'UTC') AS dt1,
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toDateTime64('1959-09-16 19:20:12.999999999', 9, 'UTC') AS dt2
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SELECT
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dt1 < dt2,
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(dt1 + INTERVAL 1 NANOSECOND) = dt2,
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(dt1 + INTERVAL 2 NANOSECOND) > dt2,
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(dt1 + INTERVAL 3 NANOSECOND) > dt2;
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-- At UNIX epoch border
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WITH
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toDateTime64('1969-12-31 23:59:59.999999998', 9, 'UTC') AS dt1,
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toDateTime64('1969-12-31 23:59:59.999999999', 9, 'UTC') AS dt2
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SELECT
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dt1 < dt2,
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(dt1 + INTERVAL 1 NANOSECOND) = dt2,
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(dt1 + INTERVAL 2 NANOSECOND) > dt2,
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(dt1 + INTERVAL 3 NANOSECOND) > dt2;
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-- After UNIX epoch
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WITH
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toDateTime64('2001-12-31 23:59:59.999999998', 9, 'UTC') AS dt1,
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toDateTime64('2001-12-31 23:59:59.999999999', 9, 'UTC') AS dt2
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SELECT
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dt1 < dt2,
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(dt1 + INTERVAL 1 NANOSECOND) = dt2,
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(dt1 + INTERVAL 2 NANOSECOND) > dt2,
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(dt1 + INTERVAL 3 NANOSECOND) > dt2;
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-- At upper DT64 bound (DT64 precision is lower here by design)
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WITH
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toDateTime64('2282-12-31 23:59:59.999998', 6, 'UTC') AS dt1,
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toDateTime64('2282-12-31 23:59:59.999999', 6, 'UTC') AS dt2
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SELECT
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dt1 < dt2,
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(dt1 + INTERVAL 1 MICROSECOND) = dt2,
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(dt1 + INTERVAL 2 MICROSECOND) > dt2,
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(dt1 + INTERVAL 3 MICROSECOND) > dt2;
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