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15 lines
484 B
Plaintext
15 lines
484 B
Plaintext
DROP DATABASE IF EXISTS mcs194_db;
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CREATE DATABASE mcs194_db;
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USE mcs194_db;
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CREATE TABLE t1 (x INT, y MEDIUMINT, z CHAR(5))ENGINE=Columnstore;
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INSERT INTO t1 VALUES (NULL, NULL, ''),(20, 1, 'aaa'),(39, 2, 'aaa'),(48, 3, 'bbb'),(57, 4, 'bbb'),(66, 5, 'aaa'),(75, 6, 'aaa'),(84, 7, 'bbb');
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SELECT COVAR_SAMP(y, x) FROM t1;
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COVAR_SAMP(y, x)
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47
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SELECT z, COVAR_SAMP(y, x) FROM t1 GROUP BY z ORDER BY z;
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z COVAR_SAMP(y, x)
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NULL NULL
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aaa 59.333333333333336
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bbb 39
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DROP DATABASE mcs194_db;
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