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28 lines
602 B
Plaintext
28 lines
602 B
Plaintext
DROP DATABASE IF EXISTS mcs95_db;
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CREATE DATABASE mcs95_db;
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USE mcs95_db;
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CREATE TABLE t1 (a CHAR(1), b INT)ENGINE=Columnstore;
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INSERT INTO t1 VALUES ('', NULL),('a', 12),('a', 13),('b', 14),('c', 15),('d', 16),('d', 17),('b', 18),('a', 19);
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SELECT a, VARIANCE(b) FROM t1 GROUP BY a ORDER BY a;
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a VARIANCE(b)
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NULL NULL
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a 9.5556
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b 4.0000
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c 0.0000
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d 0.2500
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SELECT a, VAR_POP(b) FROM t1 GROUP BY a ORDER BY a;
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a VAR_POP(b)
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NULL NULL
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a 9.5556
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b 4.0000
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c 0.0000
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d 0.2500
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SELECT a, VAR_SAMP(b) FROM t1 GROUP BY a ORDER BY a;
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a VAR_SAMP(b)
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NULL NULL
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a 14.3333
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b 8.0000
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c NULL
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d 0.5000
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DROP DATABASE mcs95_db;
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