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139 lines
2.5 KiB
Plaintext
139 lines
2.5 KiB
Plaintext
DROP DATABASE IF EXISTS mcs147_db;
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CREATE DATABASE mcs147_db;
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USE mcs147_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),('b', 15),('b', 16),('b', 17),('b', 18),('a', 19);
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SELECT a, b, VAR_SAMP(b) OVER(PARTITION BY a) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 19 14.3333
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a 13 14.3333
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a 12 14.3333
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b 17 2.5000
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b 18 2.5000
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b 14 2.5000
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b 15 2.5000
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b 16 2.5000
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SELECT a, b, VAR_SAMP(b) OVER(PARTITION BY a DESC) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 19 14.3333
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a 13 14.3333
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a 12 14.3333
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b 17 2.5000
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b 18 2.5000
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b 14 2.5000
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b 15 2.5000
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b 16 2.5000
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SELECT a, b, VAR_SAMP(b) OVER(PARTITION BY b DESC) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 12 NULL
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a 13 NULL
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b 14 NULL
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b 15 NULL
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b 16 NULL
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b 17 NULL
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b 18 NULL
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a 19 NULL
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SELECT a, b, VAR_SAMP(b) OVER(PARTITION BY b) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 12 NULL
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a 13 NULL
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b 14 NULL
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b 15 NULL
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b 16 NULL
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b 17 NULL
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b 18 NULL
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a 19 NULL
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SELECT a, b, VAR_SAMP(b) OVER(ORDER BY a) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 19 14.3333
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a 13 14.3333
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a 12 14.3333
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b 17 6.0000
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b 18 6.0000
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b 14 6.0000
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b 15 6.0000
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b 16 6.0000
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SELECT a, b, VAR_SAMP(b) OVER(ORDER BY b) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 12 NULL
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a 13 0.5000
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b 14 1.0000
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b 15 1.6667
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b 16 2.5000
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b 17 3.5000
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b 18 4.6667
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a 19 6.0000
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SELECT a, b, VAR_SAMP(b) OVER(ORDER BY a DESC) var_samp FROM t1;
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a b var_samp
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b 16 2.5000
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b 15 2.5000
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b 18 2.5000
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b 17 2.5000
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b 14 2.5000
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a 19 6.0000
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a 12 6.0000
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a 13 6.0000
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NULL NULL 6.0000
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SELECT a, b, VAR_SAMP(b) OVER(ORDER BY b DESC) var_samp FROM t1;
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a b var_samp
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a 19 NULL
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b 18 0.5000
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b 17 1.0000
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b 16 1.6667
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b 15 2.5000
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b 14 3.5000
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a 13 4.6667
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a 12 6.0000
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NULL NULL 6.0000
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SELECT a, b, VAR_SAMP(b) OVER(PARTITION BY a ORDER BY b) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 12 NULL
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a 13 0.5000
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a 19 14.3333
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b 14 NULL
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b 15 0.5000
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b 16 1.0000
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b 17 1.6667
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b 18 2.5000
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SELECT a, b, VAR_SAMP(b) OVER(PARTITION BY b ORDER BY a) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 12 NULL
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a 13 NULL
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b 14 NULL
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b 15 NULL
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b 16 NULL
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b 17 NULL
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b 18 NULL
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a 19 NULL
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SELECT a, b, VAR_SAMP(b) OVER(PARTITION BY b ORDER BY b DESC) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 12 NULL
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a 13 NULL
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b 14 NULL
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b 15 NULL
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b 16 NULL
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b 17 NULL
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b 18 NULL
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a 19 NULL
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SELECT a, b, VAR_SAMP(b) OVER(PARTITION BY a ORDER BY a DESC) var_samp FROM t1;
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a b var_samp
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NULL NULL NULL
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a 19 14.3333
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a 13 14.3333
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a 12 14.3333
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b 17 2.5000
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b 18 2.5000
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b 14 2.5000
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b 15 2.5000
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b 16 2.5000
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DROP DATABASE mcs147_db;
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