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113 lines
2.2 KiB
Plaintext
113 lines
2.2 KiB
Plaintext
DROP DATABASE IF EXISTS mcs171_db;
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CREATE DATABASE mcs171_db;
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USE mcs171_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, 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=utf8mb3 COLLATE=utf8mb3_general_ci
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SELECT IFNULL(NULL, 'abc');
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IFNULL(NULL, 'abc')
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abc
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SELECT IFNULL(NULL, 123);
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IFNULL(NULL, 123)
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123
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SELECT IFNULL('abc', 123);
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IFNULL('abc', 123)
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abc
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SELECT ISNULL(NULL);
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ISNULL(NULL)
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1
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SELECT ISNULL(1);
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ISNULL(1)
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0
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SELECT ISNULL('a');
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ISNULL('a')
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0
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SELECT NULLIF(1, 1);
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NULLIF(1, 1)
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NULL
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SELECT NULLIF('abc', 'a');
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NULLIF('abc', 'a')
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abc
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SELECT NULLIF(1, 'abcd');
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NULLIF(1, 'abcd')
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1
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SELECT a, ISNULL(a) FROM t1;
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a ISNULL(a)
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NULL 1
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a 0
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b 0
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c 0
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d 0
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SELECT b, ISNULL(b) FROM t1;
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b ISNULL(b)
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NULL 1
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12 0
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13 0
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14 0
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15 0
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SELECT c, ISNULL(c) FROM t1;
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c ISNULL(c)
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0000-00-00 00:00:00 0
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1212-12-12 00:00:00 0
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1313-03-13 13:13:13 0
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1414-04-14 00:00:00 0
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2015-05-15 15:15:15 0
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SELECT d, ISNULL(d) FROM t1;
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d ISNULL(d)
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NULL 1
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1.19691e100 0
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2.1961e18 0
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0.16191 0
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1.971917 0
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SELECT a, IFNULL(a, 'Null Char') FROM t1;
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a IFNULL(a, 'Null Char')
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NULL Null Char
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a a
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b b
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c c
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d d
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SELECT b, IFNULL(b, 'Null Integer') FROM t1;
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b IFNULL(b, 'Null Integer')
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NULL Null Integer
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12 12
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13 13
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14 14
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15 15
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SELECT c, IFNULL(d, 'Null Decimal') FROM t1;
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c IFNULL(d, 'Null Decimal')
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0000-00-00 00:00:00 Null Decimal
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1212-12-12 00:00:00 1.19691e100
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1313-03-13 13:13:13 2.1961e18
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1414-04-14 00:00:00 0.16191
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2015-05-15 15:15:15 1.971917
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SELECT a, NULLIF(a, 'c') FROM t1;
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a NULLIF(a, 'c')
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NULL NULL
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a a
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b b
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c NULL
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d d
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SELECT b, NULLIF(b, 15) FROM t1;
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b NULLIF(b, 15)
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NULL NULL
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12 12
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13 13
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14 14
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15 NULL
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SELECT c, NULLIF(c, '2015-5-15') FROM t1;
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c NULLIF(c, '2015-5-15')
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0000-00-00 00:00:00 0000-00-00 00:00:00
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1212-12-12 00:00:00 1212-12-12 00:00:00
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1313-03-13 13:13:13 1313-03-13 13:13:13
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1414-04-14 00:00:00 1414-04-14 00:00:00
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2015-05-15 15:15:15 2015-05-15 15:15:15
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DROP DATABASE mcs171_db;
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