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34 lines
1.0 KiB
MySQL
34 lines
1.0 KiB
MySQL
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DROP TABLE IF EXISTS table_with_compact_parts;
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CREATE TABLE table_with_compact_parts
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(
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date Date,
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key UInt64,
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value1 String,
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value2 String,
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value3 String
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)
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ENGINE = MergeTree()
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PARTITION BY date
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ORDER BY key
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settings index_granularity = 8,
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min_rows_for_wide_part = 10;
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INSERT INTO table_with_compact_parts SELECT toDate('2019-10-01') + number % 3, number, toString(number), toString(number), toString(number) from numbers(9);
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SELECT value1 FROM table_with_compact_parts WHERE key = 1;
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ALTER TABLE table_with_compact_parts RENAME COLUMN value1 to renamed_value1;
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SELECT renamed_value1 FROM table_with_compact_parts WHERE key = 1;
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SELECT * FROM table_with_compact_parts WHERE key = 1 FORMAT TSVWithNames;
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ALTER TABLE table_with_compact_parts RENAME COLUMN value2 TO renamed_value2, RENAME COLUMN value3 TO renamed_value3;
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SELECT renamed_value2, renamed_value3 FROM table_with_compact_parts WHERE key = 7;
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SELECT * FROM table_with_compact_parts WHERE key = 7 FORMAT TSVWithNames;
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DROP TABLE IF EXISTS table_with_compact_parts;
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