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35 lines
712 B
Plaintext
35 lines
712 B
Plaintext
DROP DATABASE IF EXISTS mcs96_db;
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CREATE DATABASE mcs96_db;
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USE mcs96_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, STD(b) FROM t1 GROUP BY a ORDER BY a;
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a STD(b)
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NULL NULL
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a 3.0912
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b 2.0000
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c 0.0000
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d 0.5000
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SELECT a, STDDEV(b) FROM t1 GROUP BY a ORDER BY a;
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a STDDEV(b)
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NULL NULL
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a 3.0912
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b 2.0000
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c 0.0000
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d 0.5000
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SELECT a, STDDEV_POP(b) FROM t1 GROUP BY a ORDER BY a;
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a STDDEV_POP(b)
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NULL NULL
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a 3.0912
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b 2.0000
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c 0.0000
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d 0.5000
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SELECT a, STDDEV_SAMP(b) FROM t1 GROUP BY a ORDER BY a;
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a STDDEV_SAMP(b)
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NULL NULL
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a 3.7859
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b 2.8284
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c NULL
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d 0.7071
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DROP DATABASE mcs96_db;
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