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55 lines
2.3 KiB
SQL
55 lines
2.3 KiB
SQL
SELECT 'simple partition key:';
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DROP TABLE IF EXISTS table1 SYNC;
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CREATE TABLE table1 (id Int64, v UInt64)
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ENGINE = ReplicatedReplacingMergeTree('/clickhouse/tables/{database}/test_table12', '1', v)
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PARTITION BY id % 200 ORDER BY id;
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INSERT INTO table1 SELECT number-205, number FROM numbers(10);
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INSERT INTO table1 SELECT number-205, number FROM numbers(400, 10);
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SELECT toInt64(partition) as p FROM system.parts WHERE table='table1' and database=currentDatabase() ORDER BY p;
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select 'where id % 200 = +-2:';
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select id from table1 where id % 200 = 2 OR id % 200 = -2 order by id;
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select 'where id % 200 > 0:';
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select id from table1 where id % 200 > 0 order by id;
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select 'where id % 200 < 0:';
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select id from table1 where id % 200 < 0 order by id;
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SELECT 'tuple as partition key:';
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DROP TABLE IF EXISTS table2;
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CREATE TABLE table2 (id Int64, v UInt64)
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ENGINE = MergeTree()
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PARTITION BY (toInt32(id / 2) % 3, id % 200) ORDER BY id;
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INSERT INTO table2 SELECT number-205, number FROM numbers(10);
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INSERT INTO table2 SELECT number-205, number FROM numbers(400, 10);
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SELECT partition as p FROM system.parts WHERE table='table2' and database=currentDatabase() ORDER BY p;
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SELECT 'recursive modulo partition key:';
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DROP TABLE IF EXISTS table3;
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CREATE TABLE table3 (id Int64, v UInt64)
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ENGINE = MergeTree()
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PARTITION BY (id % 200, (id % 200) % 10, toInt32(round((id % 200) / 2, 0))) ORDER BY id;
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INSERT INTO table3 SELECT number-205, number FROM numbers(10);
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INSERT INTO table3 SELECT number-205, number FROM numbers(400, 10);
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SELECT partition as p FROM system.parts WHERE table='table3' and database=currentDatabase() ORDER BY p;
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DETACH TABLE table3;
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ATTACH TABLE table3;
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SELECT 'After detach:';
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SELECT partition as p FROM system.parts WHERE table='table3' and database=currentDatabase() ORDER BY p;
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SELECT 'Indexes:';
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DROP TABLE IF EXISTS table4;
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CREATE TABLE table4 (id Int64, v UInt64, s String,
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INDEX a (id * 2, s) TYPE minmax GRANULARITY 3
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) ENGINE = MergeTree() PARTITION BY id % 10 ORDER BY v;
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INSERT INTO table4 SELECT number, number, toString(number) FROM numbers(1000);
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SELECT count() FROM table4 WHERE id % 10 = 7;
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SELECT 'comparison:';
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SELECT v, v-205 as vv, modulo(vv, 200), moduloLegacy(vv, 200) FROM table1 ORDER BY v;
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DROP TABLE table1 SYNC;
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DROP TABLE table2 SYNC;
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DROP TABLE table3 SYNC;
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DROP TABLE table4 SYNC;
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