mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 08:40:50 +00:00
28 lines
865 B
SQL
28 lines
865 B
SQL
DROP TABLE IF EXISTS src_table;
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DROP TABLE IF EXISTS copied_table;
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CREATE TABLE src_table
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(
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time DateTime('UTC') DEFAULT fromUnixTimestamp(sipTimestamp),
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sipTimestamp UInt64
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)
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ENGINE = MergeTree
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ORDER BY time;
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INSERT INTO src_table(sipTimestamp) VALUES (toUnixTimestamp(toDateTime('2024-05-20 09:00:00', 'UTC')));
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CREATE TABLE copied_table AS src_table;
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ALTER TABLE copied_table RENAME COLUMN `sipTimestamp` TO `timestamp`;
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SHOW CREATE TABLE src_table;
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SELECT name, default_expression FROM system.columns WHERE database = currentDatabase() AND table = 'src_table' ORDER BY name;
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INSERT INTO src_table(sipTimestamp) VALUES (toUnixTimestamp(toDateTime('2024-05-20 09:00:00', 'UTC')));
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SELECT * FROM src_table ORDER BY time FORMAT JSONEachRow;
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SELECT * FROM copied_table ORDER BY time FORMAT JSONEachRow;
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DROP TABLE src_table;
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DROP TABLE copied_table;
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