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kymtwyf/ReplacingMergeTree example.md

Created January 7, 2021 05:49
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ReplacingMergeTree example.md

create table

CREATE TABLE demo.replacemt (
  key UInt32, 
  value UInt32
)
ENGINE = ReplacingMergeTree
ORDER BY key

insert data

INSERT INTO demo.replacemt values(1,1),(1,2),(2,1)

query data immediately

SELECT * FROM demo.replacemt
key value
1 1
1 2
2 1

force optimizing

OPTIMIZE TABLE demo.replacemt FINAL

query data again

SELECT * FROM demo.replacemt
key value
1 2
2 1
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