clickhouseCreate ReplacingMergeTree table
CREATE TABLE rt(id UInt32, ver UInt8, name String) ENGINE = ReplacingMergeTree(ver) ORDER BY idctrl + crtname of the ReplacingMergeTree table to create | id UInt32column to be used as a primary key |
ver UInt8version column (increment it to overwrite row identified by primary key) | name Stringsample string column |
(ver)name of the version column | ORDER BY idprimary key (unique row identification) expression ( |
Usage example
CREATE TABLE rt(id UInt32, ver UInt8, name String) ENGINE = ReplacingMergeTree(ver) ORDER BY id;
INSERT INTO rt VALUES(1, 1, 'Donald');
INSERT INTO rt VALUES(1, 2, 'Joe');
SELECT * FROM rt FINAL;output
┌─id─┬─ver─┬─name─┐
│ 1 │ 2 │ Joe │
└────┴─────┴──────┘More of Clickhouse
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