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56 lines
1.6 KiB
SQL
56 lines
1.6 KiB
SQL
DROP TABLE IF EXISTS rename_table;
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CREATE TABLE rename_table (key Int32, value1 Int32, value2 Int32) ENGINE = MergeTree ORDER BY tuple();
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INSERT INTO rename_table VALUES (1, 2, 3);
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-- replace one with other
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ALTER TABLE rename_table RENAME COLUMN value1 TO old_value1, RENAME COLUMN value2 TO value1;
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SHOW CREATE TABLE rename_table;
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SELECT * FROM rename_table FORMAT TSVWithNames;
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INSERT INTO rename_table VALUES (4, 5, 6);
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-- rename all columns simultaneously
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ALTER TABLE rename_table RENAME COLUMN old_value1 TO v1, RENAME COLUMN value1 TO v2, RENAME COLUMN key to k;
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SHOW CREATE TABLE rename_table;
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SELECT * FROM rename_table ORDER BY k FORMAT TSVWithNames;
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DROP TABLE IF EXISTS rename_table;
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SELECT '---polymorphic---';
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DROP TABLE IF EXISTS rename_table_polymorphic;
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CREATE TABLE rename_table_polymorphic (
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key Int32,
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value1 Int32,
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value2 Int32
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)
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ENGINE = MergeTree
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ORDER BY tuple()
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SETTINGS min_rows_for_wide_part = 10000;
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INSERT INTO rename_table_polymorphic VALUES (1, 2, 3);
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ALTER TABLE rename_table_polymorphic RENAME COLUMN value1 TO old_value1, RENAME COLUMN value2 TO value1;
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SHOW CREATE TABLE rename_table_polymorphic;
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SELECT * FROM rename_table_polymorphic FORMAT TSVWithNames;
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INSERT INTO rename_table_polymorphic VALUES (4, 5, 6);
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-- rename all columns simultaneously
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ALTER TABLE rename_table_polymorphic RENAME COLUMN old_value1 TO v1, RENAME COLUMN value1 TO v2, RENAME COLUMN key to k;
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SHOW CREATE TABLE rename_table_polymorphic;
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SELECT * FROM rename_table_polymorphic ORDER BY k FORMAT TSVWithNames;
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DROP TABLE IF EXISTS rename_table_polymorphic;
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