mirror of
https://github.com/GreptimeTeam/greptimedb.git
synced 2026-01-07 22:02:56 +00:00
111 lines
4.5 KiB
Plaintext
111 lines
4.5 KiB
Plaintext
CREATE TABLE test(i INTEGER, j INTEGER, t TIMESTAMP TIME INDEX);
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Affected Rows: 0
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INSERT INTO test VALUES (1, 1, 1), (NULL, 1, 2), (1, NULL, 3);
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Affected Rows: 3
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SELECT * FROM test ORDER BY i NULLS FIRST, j NULLS LAST;
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+---+---+-------------------------+
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| i | j | t |
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+---+---+-------------------------+
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| | 1 | 1970-01-01T00:00:00.002 |
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| 1 | 1 | 1970-01-01T00:00:00.001 |
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| 1 | | 1970-01-01T00:00:00.003 |
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+---+---+-------------------------+
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SELECT * FROM test ORDER BY i NULLS FIRST, j NULLS FIRST;
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+---+---+-------------------------+
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| i | j | t |
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+---+---+-------------------------+
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| | 1 | 1970-01-01T00:00:00.002 |
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| 1 | | 1970-01-01T00:00:00.003 |
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| 1 | 1 | 1970-01-01T00:00:00.001 |
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+---+---+-------------------------+
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SELECT * FROM test ORDER BY i NULLS LAST, j NULLS FIRST;
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+---+---+-------------------------+
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| i | j | t |
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+---+---+-------------------------+
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| 1 | | 1970-01-01T00:00:00.003 |
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| 1 | 1 | 1970-01-01T00:00:00.001 |
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| | 1 | 1970-01-01T00:00:00.002 |
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+---+---+-------------------------+
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SELECT i, j, row_number() OVER (PARTITION BY i ORDER BY j NULLS FIRST) FROM test ORDER BY i NULLS FIRST, j NULLS FIRST;
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+---+---+------------------------------------------------------------------------------------------------------------------------+
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| i | j | ROW_NUMBER() PARTITION BY [test.i] ORDER BY [test.j ASC NULLS FIRST] RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW |
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+---+---+------------------------------------------------------------------------------------------------------------------------+
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| | 1 | 1 |
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| 1 | | 1 |
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| 1 | 1 | 2 |
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+---+---+------------------------------------------------------------------------------------------------------------------------+
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SELECT i, j, row_number() OVER (PARTITION BY i ORDER BY j NULLS LAST) FROM test ORDER BY i NULLS FIRST, j NULLS FIRST;
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+---+---+-----------------------------------------------------------------------------------------------------------------------+
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| i | j | ROW_NUMBER() PARTITION BY [test.i] ORDER BY [test.j ASC NULLS LAST] RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW |
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+---+---+-----------------------------------------------------------------------------------------------------------------------+
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| | 1 | 1 |
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| 1 | | 2 |
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| 1 | 1 | 1 |
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+---+---+-----------------------------------------------------------------------------------------------------------------------+
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SELECT * FROM test ORDER BY i NULLS FIRST, j NULLS LAST LIMIT 2;
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+---+---+-------------------------+
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| i | j | t |
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+---+---+-------------------------+
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| | 1 | 1970-01-01T00:00:00.002 |
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| 1 | 1 | 1970-01-01T00:00:00.001 |
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+---+---+-------------------------+
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SELECT * FROM test ORDER BY i NULLS LAST, j NULLS LAST LIMIT 2;
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+---+---+-------------------------+
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| i | j | t |
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+---+---+-------------------------+
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| 1 | 1 | 1970-01-01T00:00:00.001 |
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| 1 | | 1970-01-01T00:00:00.003 |
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+---+---+-------------------------+
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SELECT * FROM test ORDER BY i;
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+---+---+-------------------------+
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| i | j | t |
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+---+---+-------------------------+
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| 1 | 1 | 1970-01-01T00:00:00.001 |
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| 1 | | 1970-01-01T00:00:00.003 |
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| | 1 | 1970-01-01T00:00:00.002 |
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+---+---+-------------------------+
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SELECT * FROM test ORDER BY i NULLS FIRST;
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+---+---+-------------------------+
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| i | j | t |
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+---+---+-------------------------+
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| | 1 | 1970-01-01T00:00:00.002 |
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| 1 | 1 | 1970-01-01T00:00:00.001 |
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| 1 | | 1970-01-01T00:00:00.003 |
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+---+---+-------------------------+
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SELECT * FROM test ORDER BY i NULLS LAST;
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+---+---+-------------------------+
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| i | j | t |
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+---+---+-------------------------+
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| 1 | 1 | 1970-01-01T00:00:00.001 |
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| 1 | | 1970-01-01T00:00:00.003 |
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| | 1 | 1970-01-01T00:00:00.002 |
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+---+---+-------------------------+
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DROP TABLE test;
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Affected Rows: 0
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