mirror of
https://github.com/mariadb-corporation/mariadb-columnstore-engine.git
synced 2025-04-20 09:07:44 +03:00
54 lines
1.8 KiB
Plaintext
54 lines
1.8 KiB
Plaintext
DROP DATABASE IF EXISTS mcs174_db;
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CREATE DATABASE mcs174_db;
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USE mcs174_db;
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SET default_storage_engine=Columnstore;
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CREATE TABLE t1 (a CHAR(1), b INT, c DATETIME, d DOUBLE);
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INSERT INTO t1 VALUES ('', NULL, '0-0-0', NULL),('a', 12, '1212-12-12', 1.19691E+100),('b', 13, '1313-3-13 13:13:13', 2.1961E+18),('c', 14, '1414-4-14', 0.16191),('d', 15, '2015-5-15 15:15:15', 1.971917);
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` char(1) DEFAULT NULL,
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`b` int(11) DEFAULT NULL,
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`c` datetime DEFAULT NULL,
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`d` double DEFAULT NULL
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) ENGINE=Columnstore DEFAULT CHARSET=latin1
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SELECT b, c, (CASE WHEN a = 'b' THEN b ELSE c END) FROM t1;
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b c (CASE WHEN a = 'b' THEN b ELSE c END)
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NULL 0000-00-00 00:00:00 0000-00-00 00:00:00
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12 1212-12-12 00:00:00 1212-12-12 00:00:00
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13 1313-03-13 13:13:13 13
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14 1414-04-14 00:00:00 1414-04-14 00:00:00
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15 2015-05-15 15:15:15 2015-05-15 15:15:15
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SELECT b, a, (CASE WHEN b > 13 THEN b ELSE a END) FROM t1;
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b a (CASE WHEN b > 13 THEN b ELSE a END)
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NULL NULL NULL
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12 a a
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13 b b
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14 c 14
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15 d 15
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SELECT c, a, (CASE WHEN d > 1 THEN a ELSE c END) FROM t1;
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c a (CASE WHEN d > 1 THEN a ELSE c END)
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0000-00-00 00:00:00 NULL 0000-00-00 00:00:00
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1212-12-12 00:00:00 a a
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1313-03-13 13:13:13 b b
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1414-04-14 00:00:00 c 1414-04-14 00:00:00
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2015-05-15 15:15:15 d d
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SELECT a, c, (CASE WHEN c IS NULL THEN a ELSE c END) FROM t1;
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a c (CASE WHEN c IS NULL THEN a ELSE c END)
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NULL 0000-00-00 00:00:00 0000-00-00 00:00:00
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a 1212-12-12 00:00:00 1212-12-12 00:00:00
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b 1313-03-13 13:13:13 1313-03-13 13:13:13
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c 1414-04-14 00:00:00 1414-04-14 00:00:00
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d 2015-05-15 15:15:15 2015-05-15 15:15:15
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SELECT (CASE WHEN a = 'a' THEN 0 ELSE 1 END) FROM t1;
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(CASE WHEN a = 'a' THEN 0 ELSE 1 END)
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1
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0
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1
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1
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1
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SELECT (CASE WHEN 10 > 5 THEN 'True' ELSE 'False' END);
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(CASE WHEN 10 > 5 THEN 'True' ELSE 'False' END)
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True
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DROP DATABASE mcs174_db;
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