mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-05-30 00:27:08 +03:00
91 lines
3.7 KiB
Plaintext
91 lines
3.7 KiB
Plaintext
DROP DATABASE IF EXISTS mcs91_db;
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CREATE DATABASE mcs91_db;
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USE mcs91_db;
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CREATE TABLE t1
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(
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t1_int INT,
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t1_decimal DECIMAL(5,2),
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t1_text TEXT,
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t1_char CHAR(1),
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t1_datetime DATETIME
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)ENGINE=Columnstore;
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INSERT INTO t1 VALUES(NULL, NULL, '', '', '0000-00-00');
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INSERT INTO t1 VALUES(123456, 111.11, repeat('a',10), 'a', '1111-11-11 11:11:11');
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INSERT INTO t1 VALUES(NULL, 222.22, '', 'b', '2222-12-22 22:22:22');
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SELECT *, COALESCE(t1_int, 'No Value') FROM t1 ORDER BY t1_int;
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t1_int t1_decimal t1_text t1_char t1_datetime COALESCE(t1_int, 'No Value')
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NULL NULL NULL NULL 0000-00-00 00:00:00 No Value
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NULL 222.22 NULL b 2222-12-22 22:22:22 No Value
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123456 111.11 aaaaaaaaaa a 1111-11-11 11:11:11 123456
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SELECT *, COALESCE(t1_decimal, 'No Value') FROM t1 ORDER BY t1_int;
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t1_int t1_decimal t1_text t1_char t1_datetime COALESCE(t1_decimal, 'No Value')
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NULL NULL NULL NULL 0000-00-00 00:00:00 No Value
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NULL 222.22 NULL b 2222-12-22 22:22:22 222.22
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123456 111.11 aaaaaaaaaa a 1111-11-11 11:11:11 111.11
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SELECT *, COALESCE(t1_text, 'No Value') FROM t1 ORDER BY t1_int;
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t1_int t1_decimal t1_text t1_char t1_datetime COALESCE(t1_text, 'No Value')
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NULL NULL NULL NULL 0000-00-00 00:00:00 No Value
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NULL 222.22 NULL b 2222-12-22 22:22:22 No Value
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123456 111.11 aaaaaaaaaa a 1111-11-11 11:11:11 aaaaaaaaaa
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SELECT *, COALESCE(t1_datetime, 'No Value') FROM t1 ORDER BY t1_int;
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t1_int t1_decimal t1_text t1_char t1_datetime COALESCE(t1_datetime, 'No Value')
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NULL NULL NULL NULL 0000-00-00 00:00:00 0000-00-00 00:00:00
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NULL 222.22 NULL b 2222-12-22 22:22:22 2222-12-22 22:22:22
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123456 111.11 aaaaaaaaaa a 1111-11-11 11:11:11 1111-11-11 11:11:11
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SELECT t1_int, t1_decimal, COALESCE(t1_text, LEFT(t1_char,10)) FROM t1 ORDER BY t1_int;
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t1_int t1_decimal COALESCE(t1_text, LEFT(t1_char,10))
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NULL NULL NULL
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NULL 222.22 b
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123456 111.11 aaaaaaaaaa
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SELECT t1_int, LEAST(t1_int, t1_decimal) FROM t1 ORDER BY 1;
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t1_int LEAST(t1_int, t1_decimal)
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NULL NULL
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NULL NULL
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123456 111.11
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SELECT t1_int, LEAST(t1_int, t1_decimal, t1_text) FROM t1 ORDER BY 1;
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t1_int LEAST(t1_int, t1_decimal, t1_text)
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NULL NULL
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NULL NULL
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123456 0
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SELECT t1_int, LEAST(t1_int, t1_decimal, t1_text, t1_datetime) FROM t1 ORDER BY 1;
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t1_int LEAST(t1_int, t1_decimal, t1_text, t1_datetime)
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NULL NULL
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NULL NULL
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123456 0000-00-00 00:00:00.000000
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SELECT t1_int, GREATEST(t1_int, t1_decimal) FROM t1 ORDER BY 1;
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t1_int GREATEST(t1_int, t1_decimal)
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NULL NULL
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NULL NULL
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123456 123456.00
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SELECT t1_int, GREATEST(t1_int, t1_decimal, t1_text) FROM t1 ORDER BY 1;
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t1_int GREATEST(t1_int, t1_decimal, t1_text)
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NULL NULL
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NULL NULL
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123456 123456
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SELECT t1_int, GREATEST(t1_int, t1_decimal, t1_text, t1_datetime) FROM t1 ORDER BY 1;
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t1_int GREATEST(t1_int, t1_decimal, t1_text, t1_datetime)
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NULL NULL
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NULL NULL
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123456 1111-11-11 11:11:11.000000
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SELECT t1_int, LEAST(IFNULL(t1_int, 0), IFNULL(t1_decimal, 0), IFNULL(t1_text, 'no value'), IFNULL(t1_datetime, '0')) least,
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GREATEST(IFNULL(t1_int, 0), IFNULL(t1_decimal, 0), IFNULL(t1_text, 0), IFNULL(t1_datetime, 0)) highest
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FROM t1 ORDER BY 2;
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t1_int least highest
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NULL 0 0
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123456 0 3.129152848233759e17
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NULL 0 6.256546477863076e17
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SELECT * FROM t1 WHERE ISNULL(t1_int) ORDER BY t1_decimal;
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t1_int t1_decimal t1_text t1_char t1_datetime
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NULL NULL NULL NULL 0000-00-00 00:00:00
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NULL 222.22 NULL b 2222-12-22 22:22:22
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SELECT * FROM t1 WHERE ISNULL(t1_decimal) ORDER BY t1_decimal;
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t1_int t1_decimal t1_text t1_char t1_datetime
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NULL NULL NULL NULL 0000-00-00 00:00:00
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SELECT * FROM t1 WHERE ISNULL(t1_text) ORDER BY t1_decimal;
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t1_int t1_decimal t1_text t1_char t1_datetime
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NULL NULL NULL NULL 0000-00-00 00:00:00
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NULL 222.22 NULL b 2222-12-22 22:22:22
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SELECT * FROM t1 WHERE ISNULL(t1_datetime) ORDER BY t1_decimal;
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t1_int t1_decimal t1_text t1_char t1_datetime
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DROP DATABASE mcs91_db;
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