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187 lines
3.3 KiB
Plaintext
187 lines
3.3 KiB
Plaintext
DROP DATABASE IF EXISTS mcs126_db;
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CREATE DATABASE mcs126_db;
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USE mcs126_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', 123),('a', 1),('b', 123),('c', 1861),('c', 1991),('d', 10701),('d', 1071),('a', 92);
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SELECT a, b, LAG(a) OVER(ORDER BY a) pc FROM t1;
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a b pc
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NULL NULL NULL
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a 92 NULL
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a 1 a
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a 123 a
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b 123 a
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c 1991 b
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c 1861 c
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d 1071 c
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d 10701 d
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SELECT a, b, LAG(b) OVER(ORDER BY b DESC) pc FROM t1;
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a b pc
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d 10701 NULL
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c 1991 10701
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c 1861 1991
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d 1071 1861
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a 123 1071
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b 123 123
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a 92 123
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a 1 92
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NULL NULL 1
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SELECT a, b, LAG(a) OVER(ORDER BY b) pc FROM t1;
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a b pc
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NULL NULL NULL
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a 1 NULL
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a 92 a
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b 123 a
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a 123 b
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d 1071 a
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c 1861 d
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c 1991 c
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d 10701 c
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SELECT a, b, LAG(b) OVER(ORDER BY a DESC) pc FROM t1;
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a b pc
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d 10701 NULL
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d 1071 10701
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c 1861 1071
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c 1991 1861
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b 123 1991
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a 92 123
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a 123 92
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a 1 123
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NULL NULL 1
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SELECT a, b, LAG(a) OVER w lag_value FROM t1 WINDOW w AS (ORDER BY a DESC);
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a b lag_value
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d 10701 NULL
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d 1071 d
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c 1861 d
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c 1991 c
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b 123 c
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a 92 b
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a 123 a
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a 1 a
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NULL NULL a
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SELECT a, b, LAG(b) OVER w lag_value FROM t1 WINDOW w AS (ORDER BY b);
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a b lag_value
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NULL NULL NULL
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a 1 NULL
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a 92 1
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b 123 92
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a 123 123
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d 1071 123
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c 1861 1071
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c 1991 1861
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d 10701 1991
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SELECT a, b, LAG(a) OVER(PARTITION BY a ORDER BY a DESC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 92 NULL
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a 1 a
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a 123 a
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b 123 NULL
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c 1991 NULL
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c 1861 c
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d 1071 NULL
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d 10701 d
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SELECT a, b, LAG(a) OVER(PARTITION BY a ORDER BY b DESC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 123 NULL
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a 92 a
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a 1 a
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b 123 NULL
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c 1991 NULL
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c 1861 c
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d 10701 NULL
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d 1071 d
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SELECT a, b, LAG(a) OVER(PARTITION BY a ORDER BY b ASC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 1 NULL
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a 92 a
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a 123 a
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b 123 NULL
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c 1861 NULL
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c 1991 c
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d 1071 NULL
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d 10701 d
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SELECT a, b, LAG(a) OVER(PARTITION BY b ORDER BY a DESC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 1 NULL
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a 92 NULL
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b 123 NULL
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a 123 b
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d 1071 NULL
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c 1861 NULL
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c 1991 NULL
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d 10701 NULL
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SELECT a, b, LAG(a) OVER(PARTITION BY b ORDER BY b DESC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 1 NULL
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a 92 NULL
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b 123 NULL
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a 123 b
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d 1071 NULL
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c 1861 NULL
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c 1991 NULL
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d 10701 NULL
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SELECT a, b, LAG(b) OVER(PARTITION BY a ORDER BY a DESC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 92 NULL
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a 1 92
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a 123 1
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b 123 NULL
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c 1991 NULL
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c 1861 1991
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d 1071 NULL
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d 10701 1071
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SELECT a, b, LAG(b) OVER(PARTITION BY a ORDER BY b DESC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 123 NULL
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a 92 123
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a 1 92
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b 123 NULL
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c 1991 NULL
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c 1861 1991
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d 10701 NULL
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d 1071 10701
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SELECT a, b, LAG(b) OVER(PARTITION BY a ORDER BY b ASC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 1 NULL
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a 92 1
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a 123 92
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b 123 NULL
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c 1861 NULL
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c 1991 1861
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d 1071 NULL
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d 10701 1071
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SELECT a, b, LAG(b) OVER(PARTITION BY b ORDER BY a DESC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 1 NULL
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a 92 NULL
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b 123 NULL
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a 123 123
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d 1071 NULL
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c 1861 NULL
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c 1991 NULL
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d 10701 NULL
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SELECT a, b, LAG(b) OVER(PARTITION BY b ORDER BY b DESC) lag_value FROM t1;
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a b lag_value
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NULL NULL NULL
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a 1 NULL
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a 92 NULL
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b 123 NULL
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a 123 123
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d 1071 NULL
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c 1861 NULL
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c 1991 NULL
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d 10701 NULL
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SELECT a, b, LAG(a) OVER(PARTITION BY b) lag_value FROM t1;
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ERROR HY000: No order list in window specification for 'lag'
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SELECT a, b, LAG(a) OVER(PARTITION BY a) lag_value FROM t1;
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ERROR HY000: No order list in window specification for 'lag'
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DROP DATABASE mcs126_db;
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